Catabolite repression exists in e. coli because a)it prevents utilizing complex food sources in the presence of simpler sources like glucose.So,correct option is a.
Carbon catabolite repression, or basically catabolite constraint, is a significant piece of worldwide control arrangement of different microbes and different microorganisms. Catabolite suppression permits microorganisms to adjust rapidly to a liked (quickly metabolizable) carbon and energy source first. This is generally accomplished through restraint of blend of proteins associated with catabolism of carbon sources other than the favored one.
The catabolite repression was first demonstrated to be started by glucose and accordingly once in a while alluded to as the glucose impact. In any case, the expression "glucose impact" is really a misnomer since other carbon sources are known to prompt catabolite constraint.
Hence, correct option is a.
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Which method is used to extract minerals from stream bends and along coasts?
A)
placer mining
B)
subsurface mining
C)
surface mining
D)
reclamation
E)
weathering
Please select the best answer from the choices provided
A
B
C
D
E
Answer:
C. Surface mining
Explanation:
surface mining is a category of mining that involves removing overlying mineral deposits
macroevolution: changes above the level of species-how would you explain this to another person?
Macroevolution is evolution that happens at or above the species level. It is the outcome of several generations of microevolution. Macroevolution may encompass evolutionary changes between two biotic interactions, as in coevolution, or it may necessitate the occurrence of one or more completely new species.
Macroevolution is commonly defined as the evolvement of structural components and characteristics that go far beyond the intraspecific variation observed in microevolution. In other words, macroevolution is the evolution of taxa above the species level. Anatomy and developmental biology, molecular biology, biogeography, and fossils provide evidence for large-scale evolution, also known as macroevolution. Anatomy shared by various species may be homologous due to ancestry or analogous because of similar selective pressures.
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synthetic polymer fibers, which all originate with petroleum products, are cellulose-based fibers. t or f
It is true that cellulose serves as the basis for synthetic polymer fibers, which are all made with petroleum chemicals.
The most popular kind of regenerate fiber is rayon, which is made from cellulose and is primarily a plant-based material. Cellulose-based fibers include synthetic polymer fibers, which all come from petroleum. However, polyester is rapidly destroyed by strong, mild acids despite having characteristics similar to nylon.
The term "synthetic fibers" refers to man-made fibers created by chemically modifying natural materials or polymers generated from coal or petroleum. They are typically semicrystalline polymers that can be extruded and drawn into different cross-sectional shapes. Cellulose-based fibers include synthetic polymer fibers, which all come from petroleum. While polyester shares many characteristics with nylon, it is more easily dissolved by weak and concentrated acids. Textiles or fabrics are made from fibers.
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how do genetics counselors provide genetic/genomic information to patients and families in a nondirective manner?
Genetic counselors provide genetic/genomic information to patients and families in a nondirective manner by presenting all facts and available options in a manner that neither promotes nor excludes any legally permitted decision or action.
The genetic information of a person may contain information about their own genetic testing, the genetic testing of their family members, and information about the occurrence of a disease or other issue in their family. Family medical history is included in the idea of genetic information since it is frequently used to determine a person's increased risk of contracting a disease, ailment, or condition in the future. Genetic information also includes any embryo that is legitimately possessed by a person or a member of their family utilizing an assisted reproductive technique, as well as any fetus that is being carried by the person or a pregnant family member of the person. It also encompasses an individual's request for or receipt of genetic services, as well as an individual's or a family member's engagement in clinical research that makes use of genetic services.
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explain how privatizing endangered species (private ownership) will save them from extinction. give an example.
Extinction is defined as the elimination of species due to natural or human-made factors. The species are necessary to preserve the ecosystem and biodiversity.
Private ownership of threatened or extinct species can prevent the extinction of those species. Their likelihood of being hunted, exported, traded, preyed upon, losing their habitat, and dying from natural disasters will all be decreased by private ownership. To stop them from going extinct, animals like elephants, monkeys, crocodiles, snakes, and lions are divided into private ownership categories.
The prohibition on the trade in endangered species may or may not prevent the extinction of the species, but it also may backfire and cause market booms. The ban will enable traders to engage in animal trafficking and theft, which may speed up the rate of extinction. There will be an increase in wildlife deaths as a result of poaching for their meat, fur, teeth, and skin being sold on the black market.
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For an enzyme-catalyzed reaction, when the enzyme is denatured and loses its shape, what is affected?
Enzymes are biocatalysts. They increase the rate of a chemical reaction and any change in the shape of enzyme due to its denaturation will make the enzyme ineffective and slow down the biochemical reaction.
What is an enzyme?Enzymes are the biocatalysts which when present in a reaction increases the rate of a biochemical reaction. This increase in the rate of a reaction is possible due to the lowering of activation energy which is required by the reactant molecules to transform into product molecules.
The function of enzyme is dependent upon the ability of an enzyme to bind to its specific substrate, as enzymes show the property of specificity that is they only bind to specific substrate molecules. The loss of an enzyme's three-dimensional structure or any modulation in the structure as a result of denaturation of the enzyme renders the enzyme ineffective. As a result, the biochemical reactions are slowed down to the rates that are not sustainable for life and takes very long time to complete and form product molecules.
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which is the reason that the bacterium escherichia coli would be the probable causative agent in a client with cystitis
The reason that the bacterium Escherichia coli would be the probable causative agent in a client with cystitis as it is a virulent bacterium.
Facultative anaerobes like Escherichia coli make up around 0.1% of the gut microbiota, and fecal-oral transfer is the primary route of disease transmission for these pathogenic strains of bacteria. Because they may briefly live outside the body, cells make good indicator organisms for fecal contamination testing on environmental samples. Research into E. coli that can remain in the environment for several days without a host is progressing. The bacteria is easy to culture and cultivate in a lab environment and has been the subject of extensive research for more than 60 years. Escherichia coli needs a source of carbon and energy in its chemically defined media since it is a chemoheterotroph.
The complete question is:
Which is the reason that the bacterium Escherichia coli would be the probable causative agent in a client with cystitis?
1. It thrives in the kidneys
2. It is a virulent bacterium
3. It inhabits the intestinal tract
4. It competes with fungi for host sites
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the cell bodies of sensory neurons are found in an enlarged area of the dorsal root called the gray commissure. the cell bodies of sensory neurons are found in an enlarged area of the dorsal root called the gray commissure. true false submit
It is false that the cell bodies of sensory neurons are found in an enlarged area of the dorsal root called the gray commissure.
The cell bodies of sensory neurons are in the dorsal root ganglia. The cell bodies of motor neurons are found in the gray matter of the spinal cord in the ventral region.
A collection of neurons is referred to as a nucleus if it is found in the central nervous system; a ganglion (PNS) is the name given to it if it is found in the peripheral nervous system. Ganglia are the structures that lie between the central and peripheral nervous systems together with the anterior white commissure, which connects the two halves of the spinal cord, the grey commissure is a thin strip of grey matter that surrounds the central canal of the spinal cord. In the Rexed classification, it is lamina X. Commissure in grey.
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reheating food to a temperature sufficient to kill bacteria is helpful in making food safer. however, is there a way that one can get food poisoning despite food having been reheated?
Toxins may be heat-stable above temperatures that kill germs in some situations.
Bacteria are not destroyed at temperatures below 40 degrees. Bacterial growth is inhibited but not stopped. Cooking food at temperatures of 165 degrees or above is the only technique to destroy microorganisms by temperature. Bacteria are also killed in very acidic situations, such as pickle juice.
Cooking and reheating are the most efficient methods for removing bacterial risks from food. Most foodborne germs and viruses can be eliminated when food is cooked or reheated for an extended period of time at a high enough temperature. Food should have a core temperature of at least 75°C.
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bones offer unique evidence about the history of adaptations the human body has undergone.
Which sentence from the article provides the BEST support to the statement above?
(A) Numbers in biology help us discover new insights, so much so that researchers have set up a database and a handbook of many "bionumbers" across many species, collected from the scientific literature.
(B) Feeding this model with data on the proxy network, we calculated that 23 trillion connections exist in the osteocyte network of the human body.
(C) We can use this information to understand how bones have evolved to become the self-detecting and
self-regulating biomaterial we own; that's something that can't be done with brain fossils.
(D) In the meantime, the next time you stand up, walk around or do weights, think about how the network of osteocytes in your bones are responding to the stresses and strains you are putting it through.
Answer:
(C) We can use this information to understand how bones have evolved to become the self-detecting and self-regulating biomaterial we own; that's something that can't be done with brain fossils.
Explanation:
what change occurred in each population of bacteria from the early generation to the later generation ?
The maximal population of some bacterial species at the end of the log phase can reach a density of 10 to 30 billion cells per milliliter under ideal circumstances.
Since the very beginning of life on Earth, bacteria have existed.
There is strong evidence that bacteria have existed since the early Precambrian Period, or roughly 3.5 billion years ago, as evidenced by the discovery of fossilized bacteria in rocks from the Devonian Period (419.2 million to 358.9 million years ago).
At least since the Paleoproterozoic period, which lasted for around 1.8 billion years, when oxygen was produced by cyanobacteria and entered the atmosphere, bacteria have been present in large numbers on Earth.
As a result, bacteria have had plenty of time to evolve into a variety of offspring forms and adapt to their environs.
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explain the importance of exocytosis (secretion) in cellular communication and the regulation of metabolic processes, including digestion.
Exocytosis effectively ousts the loss from the cells to keep a stable interior climate. During the course of endocytosis, cells use proteins and lipids from the plasma layer to deliver vesicles.
The exocytosis cycle conveys proteins, lipids, and carbs to the plasma layer or the extracellular space to support plant cell development, improvement, and reaction to natural boosts. Endocytosis is the course of effectively moving atoms into the cell by immersing them in its layer. Endocytosis and exocytosis are utilized by all cells to ship atoms that can't go through the film inactively. Exocytosis gives the contrary capability and pushes particles out of the cell. Endocytosis and exocytosis are significant systems for bringing substances into and out of a phone. Cells use exocytosis to discharge proteins. A significant number of the proteins made on the harsh endoplasmic reticulum and handled by the Golgi device are arranged into vesicles bound for the plasma layer.
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Arrange the levels of the taxonomic hierarchy from the group containing the most species to the group containing the fewest.Choices:FamilyKingdomClassOrderGenusPhylumDomain
The levels of the taxonomic hierarchy from the group containing the most species to the group containing the fewest are as:
Domain, Kingdom, Phylum, Class, Order, Family, Genus
Taxonomy is a subfield of biological science that deals with the representation, identification, naming, and classification of different types of living things. Each level or rank in the taxonomy has a greater number of species than the level or rank that comes after it, although all of the animals possess some qualities in common. The taxonomic ranks (groups) that contain the most species, working their way down to the group that contains the fewest, are as follows:
Domain, Kingdom, Phylum, Class, Order, Family, Genus
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why are many contaminants found at higher concentrations in polar bears and people living in greenland than they are in bears and people living in temperate and tropical areas?
Global atmospheric circulation carries airborne toxins toward the poles, where their deposition exceeds evaporation.
Polar bears are known for their calm temperament. They are naturally non-aggressive and will only attack humans when they feel threatened. In general, they are fairly gentle creatures who love to play and swim. These bear species become aggressive when they feel threatened or when their territory is invaded.
Black bears, for example, are generally less aggressive and more tolerant of humans. Although they often live near human settlements, grizzly bears prefer to stay away from human settlements and are often exterminated from heavily used or populated areas. are more robust than polar bears.
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in which phase of periodontal disease progression does pge2 mediate bone destruction by stimulating large numbers of osteoclasts to resorb alveolar bone? group of answer choices a) initial lesion b) established lesion c) early lesion d) advanced lesion
(d) Advanced lesion/ periodontitis is the phase in which periodontal disease progression does pge2 mediate bone destruction by stimulating large numbers of osteoclasts to resorb the alveolar bone.
A severe gum illness called periodontitis. It is brought on by germs that have been let to build up on your teeth and gums. Your teeth and bones may be harmed when periodontitis worsens. The harm can be prevented, though, if periodontitis is treated quickly and good dental hygiene is maintained.
The gum inflammation known as gingivitis is the precursor of periodontitis. Your gums bleeding when you brush or floss your teeth is one of the early symptoms of gingivitis. You could see some tooth discolouration as well. Plaque refers to this. A accumulation of germs and food particles on your teeth is called plaque.
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what is the specific role of the enzyme indicated by b during the formation of the new dna strands?
Joining the nucleotides that form the new DNA strand is the specific role of the enzyme indicated by b during the formation of the new dna strands.
DNA polymerase catalyzes formation of bonds between sugar groups and phosphate groups that link the DNA nucleotides together.
DNA and RNA's fundamental building units are nucleotides. They can move genetically. Enzymes need coenzymes called nucleotides to catalyse a range of biological processes. Our body uses ATP to store energy. They also take involved in metabolic processes, enzyme activity, and cell signalling.
One of the structural components, or building blocks, of DNA and RNA is the nucleotide. A nucleotide is made up of a base (one of the four compounds: adenine, thymine, guanine, or cytosine), a sugar molecule, and a phosphoric acid molecule. A nucleotide is also called as a "nucleoside monophosphate," "nucleoside diphosphate," or "nucleoside triphosphate" when all three are connected, depending on how many phosphates are in the phosphate group.
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What happens when tectonic plates slide past each other violently?
Responses
Outer core rocks grind against each other causing earthquakes.
Crustal rocks grind against each other causing mountains.
Inner core rocks grind against each other causing earthquakes.
Crustal rocks grind against each other causing earthquakes.
Answer:
Explanation:
When tectonic plates slide past each other violently, it causes Earthquakes, meaning that it can't be #2.
That leaves #1, #3, and #4
My answer: The third type of plate boundary occurs where tectonic plates slide horizontally past each other. This is known as a transform plate boundary. As the plates rub against each other, huge stresses can cause portions of the rock to break, resulting in earthquakes. Places where these breaks occur are called faults.
Answer:
inner core rocks grind against each other causing earthquake
In terms of its involvement in mutagenesis, 5BU is best described as View Available Hint(s) O a rare form of adenine that can base pair with cytosine O a chemical that alters the structure of nitrogenqus bases O a base analog that, if incorporated into a DNA molecule during replication, remains permanently in ts rare form O a base analog that can cause either A-T > G.C or G.C A.T transitions
A base analog that can cause A-T > G-C or G-C>A-T transitions.
Thymine's base analog is 5BU. The thymine analog 5BU pairs with Guanine while thymine pairs with Adenine. The bromine atom in 5BU can switch between its keto and enol forms.
During replication, an A-T pair generates an A-5BU pair when 5BU in keto form replaces the thymine. The unusual enol form of 5BU pairs with G in the first mutagenic phase of replication, and then G couples with C in the subsequent replication cycle. Consequently, the change from the A-T to the G-C pair takes place.
Rarely, the 5-BU in enol form can function as a cytosine analog. This causes C to be replaced by 5BU, turning the G-C pair into a G-BU pair, which eventually transforms into an A-T pair during the second replication cycle.
Therefore, 5BU is a base analog that can lead to transitions from A-T to G-C or G-C to A-T.
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what would you expect to see if you plated some of your transformed bacteria onto a plate without antibiotic? would there be an advantage to doing this (in terms of understanding your results)? explain.
We would observe the emergence of new types of contaminating microorganisms.
This would be beneficial since it would show how the changed bacteria would interact with the bacteria that are naturally present around them.
Bacteria may be able to quickly adapt to their surroundings by modifying their environmental DNA. This may help bacteria by promoting the spread of antibiotic resistance, but it may also be detrimental if it eliminates advantageous genes from a population.
Sanger sequencing is the most accurate method of confirming your recombinant colonies. The first step is to separate the plasmid DNA from an overnight bacterial growth.
When everything is finished, the insert can be located using sequencing primers designed for the chosen vector.
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assuming the system gets 3 atp per nadh and 2 per fadh2, how many atp molecules are produced (ignore any consumption) from the tca cycle alone? (starting at acetyl-coa and ending at oxaloacetate?)
The TCA cycle generates two ATPs for each glucose molecule (2 acetyl CoA).
The Krebs or citric acid cycle, sometimes referred to as the tricarboxylic acid (TCA) cycle, is the main source of energy for cells and is crucial for aerobic respiration.
Glycolysis and the TCA cycle are both aspects of cellular respiration.
In living things, food materials are broken down during cellular respiration, and the energy that is released is then stored as ATP and utilised for a number of crucial tasks. Carbohydrates are the main respiratory substrate. Glycolysis, the initial stage of cellular respiration, takes place in the cytoplasm of all living things. It can also be found in anaerobic organisms because it doesn't need oxygen to function. The multi-step enzymatic process involves the partial oxidation of glucose and there are produced two pyruvate molecules.
There is a net gain of 2 ATPs during glycolysis.
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what is one difference between the naturally occurring crispr system and the engineered crispr system used in the lab?
The difference between the naturally occurring CRISPR system and the engineered CRISPR system used in the lab is there is a single guide RNA that interacts with Cas9 in the naturally occurring system.
The vital first step in genome editing is to precisely target a particular DNA sequence. Target sequences in biological systems can be found thanks to the interaction between the Cas9 protein and the guide RNA.
The Cas9 protein finds and cleaves the target DNA in CRISPR/Cas systems that are both natural and artificial. The six domains that make up the Cas9 protein are the REC I, REC II, Bridge Helix, PAM Interacting, HNH, and RuvC domains.
The interaction with guide RNA is carried out by Rec I, the biggest domain. The function of the REC II domain is currently unknown. The target DNA must start the cleavage process once it has attached to the arginine-rich bridging helix.
What is one difference between the naturally occurring CRISPR system and the engineered CRISPR system used in the lab?
a. Cas9 makes single-stranded cuts in the DNA in the naturally occurring system
b. there is a single guide RNA that interacts with Cas9 in the engineered system
c. the PAM is required only for the function of the engineered system
d. there is a single guide RNA that interacts with Cas9 in the naturally occurring system
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what is the name of semi-permeable membrane which encloses the cytoplasm and all of the cellular organelles?
The semi-permeable membrane that encloses the cytoplasm and all of the cellular organelles is called the plasma membrane.
The semi-permeable membrane which encloses the cytoplasm and all of the cellular organelles is called the Plasma Membrane. This membrane is made up of two layers of phospholipids, which form a lipid bilayer. The phospholipids have a hydrophilic (water-loving) head and a hydrophobic (water-fearing) tail, which ensures that the membrane is impermeable to large molecules, such as proteins and sugars. In addition, the membrane contains various proteins and carbohydrates which give it a variety of functions. These proteins act as receptors for molecules, allowing them to move into and out of the cell, and as enzymes that catalyze reactions. Additionally, the carbohydrates on the outer surface of the membrane help to identify the cell and enable it to recognize other cells. The plasma membrane also contains cholesterol, which helps to maintain its fluidity and stability.
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Mariam applied for a job, but the owner of the company refuses to hire her. Miriam’s friend tells her that the owner won’t hire anyone of color because he is prejudiced against people who aren’t white. What do the owner’s actions BEST represent?
A.
stereotypes
B.
discrimination
C.
assimilation
D.
amalgamation
A researcher claims that increased atmospheric carbon dioxide levels cause increased growth rates in plants. Which of the following statements best supports the researcher’s claim?
The researcher's contention that atmospheric carbon dioxide serves as the precursor to photosynthesis, which plants use to create sugars and other organic molecules, is best supported by the assertions.
According to experts, plants with high CO2 levels have thicker leaves, which might exacerbate the consequences of climate change. Scientists studying plants have found that most species do something odd when atmospheric carbon dioxide levels rise: their leaves thicken.
The finding that increased carbon dioxide only boosted plant growth when nitrate, water, & temperature were preserved at normal levels was the biggest revelation from the study.
The rate of photosynthesis typically rises until it reaches a certain point because an increase in carbon dioxide concentration accelerates the rate during which carbon is integrated into carbs in the light-independent process.
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The orbital period of an object is 2 × 107 s and its total radius is 4 × 1010 m.
The tangential speed of the satellite is
m/s. (Round to the nearest whole number, do not add any punctuation.)
Picture of the question is below
The key function of the plasma is in the movement of the platelets around the body.
What is plasma?We know that the circulatory system is composed of the blood and the plasma that moves round the body. The plasma is the tool that together with the blood carries all the nutrients that the individual needs in the body.
We know that the plasma can be found in the lymph nodes and they are help in the transport of materials one of the materials that can be carried in the blood are the digested food as well as the blood platelets.
The blood platelets is the part of the blood that can be able to fight against the invaders and the disease causing organisms that may be able to enter into the body. This would help the body to remain strong.
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why are 4 h needed for every atp synthesized and exported by mitochondria, even though only 3 h need to be translocated by the atp synthase complex to synthesize one atp?
The 1 H+ needed to cotransport the Pineeds must be taken into account in the equation since the ATP synthase activity would stall if there was not enough Pi available.
Because the conversion of ADP to ATP depends on the oxidative processes taking place in the mitochondria, this procedure is referred as oxidative phosphorylation. The final phase of OXPHOS, the ATP synthase, is driven by a continuous proton motive force, which also powers the synthesis of ATP. To cotransport the Pi required for the ATP synthase complex to phosphorylate ADP, the phosphate translocase needs one H+. The 1 H+ needed to cotransport the Pineeds must be taken into account in the equation since the ATP synthase activity would stall if there was not enough Pi available.One FADH2 molecule creates 2 molecules of ATP, while one NADH molecule generates 3 molecules of ATP. In ETS, 10 NADH molecules are generated, but only 2 FADH2 molecules. This means that 34 molecules of ATP were produced overall from these NADH & FADH2 molecules.
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The formation of simple to complex organic molecules leading to emergence of life on the earth occurred in the reducing atmosphere of primitive earth. Such phenomenon was facilitated by
A. absence of carbon.
B. absence of oxygen.
C. presence of nitrogen.
D. presence of hydrogen.
Answer:
D. presence of hydrogen.
Explanation:
The formation of simple to complex organic molecules leading to the emergence of life on Earth occurred in the reducing atmosphere of the primitive Earth. Such phenomenon was facilitated by the presence of hydrogen.
The early Earth was a very different place than it is today. The atmosphere was rich in reducing gases such as methane, ammonia, and water vapor, but it was relatively poor in oxygen. This lack of oxygen, combined with the presence of hydrogen and other reducing gases, provided the conditions necessary for the formation of simple organic molecules.
Over time, these simple organic molecules combined to form more complex molecules, such as proteins and nucleic acids. These molecules eventually gave rise to the first living cells, marking the beginning of life on Earth.
The presence of hydrogen was critical to this process. Hydrogen is a highly reactive gas, and it can easily react with other molecules to form more complex compounds. In the reducing atmosphere of the primitive Earth, hydrogen played a key role in the formation of simple organic molecules, which eventually gave rise to life.
In summary, the formation of simple to complex organic molecules leading to the emergence of life on Earth occurred in the reducing atmosphere of the primitive Earth. This phenomenon was facilitated by the presence of hydrogen, which played a key role in the formation of simple organic molecules and the emergence of life.
This type of phenomenon was facilitated by presence of hydrogen.
How are simple to complex organic molecules formed on Earth?Life on Earth arose from the formation of simple to complex organic molecules in the depleting atmosphere of the primitive Earth, which was facilitated by the presence of hydrogen.
The early Earth was a very different place when it compares to today. The atmosphere was rich in reducing gases like methane, ammonia, and water vapor, but it was relatively low in oxygen due to which it combined with the presence of hydrogen and other reducing gases providing the prerequisites for the formation of complex organic molecules.
The presence of hydrogen was critical to the process because it is a highly reactive gas that can readily react with other molecules to form more complex compounds. In the depleting atmosphere of the primitive Earth, hydrogen played a key role in the formation of the complex organic molecules that gave rise to life.
Thus, this type of phenomenon was facilitated by presence of hydrogen.
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FILL IN THE BLANK. a terminator in mrna synthesis is a(n) __________.
Answer:
Specific nucleotide sequence in DNA that signals a stop
Explanation:
A terminator in mRNA synthesis is a specific nucleotide sequence in DNA that signals a stop.
Describe the Earth-sun-moon system including the cyclic patterns of lunar phases, eclipses of the sun and moon, and seasons.
Answer:
The Earth-sun-moon system involves the interactions of three celestial bodies: the Earth, the sun, and the moon. One of the most notable phenomena is the cyclic patterns of lunar phases. An eclipse of the sun occurs when the moon passes between the Earth and the sun. An eclipse of the moon, or lunar eclipse, occurs when the Earth passes between the sun and moon. This can result in a total lunar eclipse or partial lunar eclipse.
The Earth-sun-moon system also plays a role in the seasons on Earth. For example, summer is summer in the northern hemisphere and winter in the southern hemisphere.