what are the various speculation on the existance of life or how did life form on earth?
Answer:
In evolutionary biology, abiogenesis, or informally the origin of life (OoL), is the natural process ... For the oldest life forms, see Earliest known life forms. ... There are several principles and hypotheses for how abiogenesis could have occurred. ... In 2017 scientists found possible evidence of early life on land in 3.48 Gyo
Explanation:
Many scientists favor the RNA world hypothesis, in which RNA, not DNA, was the first genetic molecule of life on Earth. Other ideas include the pre-RNA world hypothesis and the metabolism-first hypothesis. Organic compounds could have been delivered to early Earth by meteorites and other celestial objects. We can only speculate about these questions, since we haven't yet found any life forms that hail from off of Earth. But we can think in a more informed way about whether life might exist on other ... When did life appear on Earth? ... For many millions of years, early Earth was pummeled by asteroids and other celestial objects.
When one mineral scratches another, it is
1. a 1 on the Mohs scale.
2.softer than the mineral is scratches
3.harder then the mineral is scratches.
1.equally as hard as the mineral it scratches.
Insulin is a hormone produced by some pancreatic cells. Scientists have isolated the DNA sequence that codes for human insulin production Which of the following best predicts the effect of inserting this gene into the DNA of a bacterial cell?
А. The recombinant bacterium will produce human insulin using its own transcription and translation machinery.
B. The recombinant bacterium will not transcribe the human insulin gene because this gene is not normally found in the bacterial genome.
C. The recombinant bacterium will transcribe the gene but will be unable to translate the mRNA.
D. The recombinant bacterium will die because it has been exposed to foreign DNA
Answer:
А. The recombinant bacterium will produce human insulin using its own transcription and translation machinery
Explanation:
This question is describing genetic engineering, which aims at producing desirable traits in organisms. In this case, the gene that encodes insulin protein in humans is inserted into the plasmid (extra-chromosomal DNA) of a bacterium. The plasmid is then inserted back into the bacterium to become a RECOMBINANT BACTERIUM.
The recombinant bacterium containing the insulin gene will produce human insulin (protein) using its own transcription and translation machinery. This genetic engineering procedure is used to mass produce insulin protein, which is administered as medicine to humans who cannot produce the protein.
Which of the following is conical movement in which the distal end of a structure moves in a circle and the proximal end remains relatively fixed?
A. Protraction
B. Rotation
C. Circumduction
D. Retraction
Answer:
The correct answer is OPTION C (Circumduction)
Explanation:
Circumduction is motions without clear opposites of the part of the body, an example is rotating the hand from the wrist. The answer is circumduction because this type of movement ensures the distal end of a bone moves in a circle while the proximal end remains relatively stable is particularly found in bones where the movements of the joints are opposite to each other example is the ball and socket joint movement. For circumduction to take place, the degree of distance between two bones of the body has to be decreased and sometimes straightened to increase the level of movement or motion produced, there must be a movement towards the middle of the body and sometimes joint movement away from the middle of the body. All these movements are in order.
GUYS PLEASE HURRY!! I need this finished in 20 mins :/ i missed a day. Im offering 100 brainly points
Answer:
A.
1. energy
2. nutrients
3. calories, water
4. metabolic rate
5. nutrients
6. weight and height
B.
1. protein, amino acids
2. viruses
3. carbohydrates, energy
4. fibers, glucose
5. fats
a. molecular
b. 'healthy'
Explanation:
please give me brainliest and you're welcome
Answer:
energy
nutrients
calories, water
metabolic rate
nutrients
weight and height
b. protein ____ (id)
carbohydrates, energy
fibers, glucose
fats
molecular
healthy
Explanation:
appreciate it
Mr. Morales is teaching a lesson on classification. He says that spiders are classified as a different group than insects because they have eight legs instead of six legs. He explains that spiders evolved first. Mr. Morales also says that having eight legs is the derived trait that separates the two groups. Antonio thinks Mr. Morales is wrong. Which piece of information is Antonio considering?
A.Spiders do not have eight legs.
B.Insects do not have six legs.
C.If spiders evolved first, six legs is the derived trait.
D.Spiders do not have derived traits, since they evolved first.
Answer: The answer is C
Explanation:
The piece of information that Antonio is considering is that if spiders evolved first, six legs are the derived trait. So the correct option is C.
What are derived traits?A trait that has been observed in a group of organisms but was not observed or was absent in the previous common ancestor of the group.
These are also the traits that are not present in the group of organisms under consideration but were observed in the previous common ancestors. This is called the secondary loss of traits.
Therefore, derived traits are not only concerned with the development of new traits but also the loss of old traits. Simplicity in a structure or function is a secondary derived trait.
Thus, because the spiders evolved before other insects, the presence of 6 legs in insects is a secondary derived trait as it represents simplicity in structure. Spiders are not derived because they are the common ancestors of the group of insects.
Therefore the correct option is C.
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Use an analogy to explain the function of the nucleus, cell membrane, mitochondria, and ribosomes
1. Which membrane-bound organelle contains the genetic material of the
cell (such as DNA)?*
O Cytoplasm
Nucleus
Mitochondria
Endoplasmic Reticulum (ER)
Answer:
Okay h
Explanation:
When you eat, your blood glucose level rises. Soon after, it drops as the glucose is stored. Where does it go?
A. Brain and liver
B. Stomach and muscles
C. Stomach and liver
D. Liver and muscles
Many animals, like mice, ______ when they sense danger. run, freeze, eat, hiss.
Help! My FREEZE answer was graded CORRECT ?!
This question has already been answered twice, a lot, for both Run AND Freeze so I need to ask again!!
My cousin had this same question from another curriculum provider at a lower grade level and her correct answer was run!!!!
You'd think anything would run is common sense! But....My question depends on what curriculum is given!
MY correct answer for my question was from biology unit 3, assignment 2, Animal Behavior and Interdependencies, printed page 3, under AVOIDING CAPTURE section, video transcript, part 1, right after 1st image, sentence " Many animals will freeze up if they hear an unfamiliar sound or feel or smell an approaching predator." and THAT'S what my ody ssey question wanted as the correct answer. Wow! So my question is... who's curriculum and test wants the run answer?
Answer:
Run
hope it will help you
this is regular science but the topic is introduction to body systems from the science book please someone help thanks
Answer:
1. Homeostasis
2. Organ system
3.The bones of the skeletal system serve to protect the body's organs, support the weight of the body, and give the body shape. The muscles of the muscular system attach to these bones, pulling on them to allow for movement of the body.
4.The nervous and endocrine systems are two forms of communication system in the human body that integrate, coordinate and respond to sensory information which is received by the human body from its surroundings
5.The skin functions by protecting the body from basic elements of nature such as water, UV sunlight and wind. ... However, skin in integumentary system acts by maintaining the internal conditions that is required by the body while it is excretory system because it secretes a fluid waste called sweat or perspiration.
6.In order to survive, cells must satisfy some basic needs such as oxygen, water, nutrients, waste removal, and maintaining of homeostasis. Oxygen and nutrients are necessary for different processes inside the cell. For instance, cellular respiration uses glucose and oxygen to form energy in the form of ATP.Water is important for different chemical reactions, as well. Also, the result of different processes, waste is produced and it is important to remove it from the cell. Finally, it is important that cell and whole body conditions do not vary so much and that homeostasis is maintained.
7.Ribosomes provide another good example of structure determining function. These small cellular components are made of protein and ribosomal RNA (rRNA). Their main function is to translate messenger RNA, or mRNA, into strings of amino acids called proteins.
8. the body is not in homeostasis from 7 to 10 hours. Explanation: The given graph shows homeostasis in terms of body temperature. The normal body temperature, that is 37 degrees C is maintained from 1 to around 6:45 hours.
9.There are several reasons why the body temperature falls continuously just like when you are exposed to an extreme cold weather or wearing wet clothing for a long time. This abnormality state of the body temperature can lead into some potential diseases and disorders like infection, insomnia, stress and sepsis
10.Sweating also hydrates your skin and maintains the balance of electrolytes in your body. The fluid you sweat comprises mainly salt and water. Excessive sweating can cause dehydration since you lose a large amount of water. The technical term for excessive sweating is hyperhidrosis.
Explanation:
Help me with this oxygen pls someone-
Answer:
What's wrong?
Explanation:
Answer:
1:nasal cavity
2:mouth
3:pharynx
4:larynx
5:trachea
6:bronchi
7:bronchioles
9:alveoli
Explanation:
I am 90% sure
Kisha adopted an abused dog that cringed every time she raised her hand to pet it. After awhile, the dog no longer cringed. This is an example of ______.
habituation, classical conditioning, latent learning, insightful learning.
Help!
Most of this question already answered say that Classical Conditioning is correct and have high star ratings!! BUT.... MY answer of HABITUATION was graded as correct?! My course material The Habituation definition is=when an animal learns not to respond to a stimulus. And my unit says Habituation is learning NOT to continue a behavior ( like cringing ) due to a lack of reinforcement ( abuse ) for that behavior. Please answer this so it will post!
Answer:
Yes.
Explanation:
Answer:
Kisha adopted an abused dog that cringed every time she raised her hand to pet it. After awhile, the dog no longer cringed. This is an example of habituation.
Explanation:
Habituation is a decrease in response to a stimulus after repeated presentations. Habituation occurs when animals are exposed to the same stimuli repeatedly, and eventually stop responding to that stimulus.If the calcium in your blood decreases below homeostasis levels, a gland in the
brain will sense the decrease and send a chemical message to your bones. Your
bones will release calcium into the blood, bringing blood calcium levels back up. *
PLEASE HELP Urgent
Is it positive or negative feedback
Listen How are channel and carrier proteins similar? Select all that apply.
A. Channel and carrier proteins move substances in a certain direction, regardless of their concentration gradients.
B. Channel and carrier proteins are both types of facilitated transport.
C. Channel and carrier proteins can only move substances in one direction either into the cell or out of the cell.
D. Channel and carrier proteins always move substances from the side of the membrane with the highest concentration to the side with the lowest concentration.
Answer:
a
Explanation:
A. Channel and carrier proteins move substances in a certain direction, regardless of their concentration gradients.
Channel and carrier proteins are both types of facilitated transport.
Facilitated diffusion is one of the ways of transporting molecules and is characterized by the use of proteins that are inserted in the plasma membrane, such as ion channels and carriers or permeases.
Ions, amino acids and monosaccharides, among many other molecules, cannot cross the plasma membrane, because they are polar or are very large in size.
So, for the cell to obtain or eliminate these substances, the presence of transporter proteins is necessary.
This diffusion is a type of passive transport, because it takes advantage of the concentration gradient of the molecules and does not waste energy.
Ion channels are integral tunnel-shaped proteins, selective for one, two, or three ions. When a channel opens, ions flow under two principles: the concentration gradient and the electrochemical gradient.Consequently, when an ion channel opens, the potential difference between the two compartments is altered.
Transmembrane proteins mediate the transport of molecules such as bicarbonate or large, polar, uncharged molecules such as glucose.The transport through these proteins occurs in favor of the concentration gradient, and by a reversible conformational change of the proteins that allows the translocation of the molecule to the other side of the membrane.
This type of transport is always without energy expenditure and in favor of the electrochemical gradient, it occurs in the following way:
Uniport, a single molecule translocates in only one direction.Simporte, two molecules that translocate in the same direction.Therefore, we can conclude that channel and carrier proteins are both types of facilitated transport.
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What do you think is the colour for happiness?
Answer:
yellow
Explanation:
Answer:
Yellow is the color of sunshine. It's associated with joy, happiness, intellect, and energy.
Explanation:
What is formed as a result of mitosis?
A.four genetically different cells.
B.four genetically identical cells
C.two genetically different cells
D.two genetically identical cells
Answer:
D. two genetically identical cells.
Explanation:
Identify the phase of the moon labeled C that would be seen from the earth labeled B
Answer:
The correct answer is - a lunar eclipse (total lunar eclipse).
Explanation:
When the sun and moon align opposite one another and earth between them and blocks the light of the sun to reach the moon known as a lunar eclipse. A lunar eclipse can be a partial or total lunar eclipse.
A partial lunar eclipse occurs when a part of the earth covers the moon to get the light or between the sun and the moon. The total lunar eclipse occurs when the whole moon is opposite to the sun and earth between them.
October 1, 2017 marks 27 years since the beginning of the Human Genome
Project. The goal of the group was to map the entire 3 billions bases and
80,000 genes in the human genome. On April 14, 2003, it was announced
that the goal was accomplished. Using this information, scientists have been
able to predict the risk of genetic diseases and understand the process of
inheritance. Which of the following statements best describes the process of
using the genetic code to produce polypeptides (proteins)?
Translation is used to produce a strand of RNA and proteins from a single strand of DNA.
O RNA produces a strand of DNA through transcription, then the DNA builds a protein molecule
through translation
O A single strand of DNA is used to make mRNA using translation, then the mRNA provides the
template for producing a protein through transcription
O A single strand of DNA is used to produce mRNA through transcription, then translation provides
the code for bonding amino acids to make a protein.
Answer:
The last one. A single strand of DNA is used to produce mRNA through transcription, then translation provides the code for bonding amino acids to make a protein.
Explanation:
Educated guess, but also. Translation is the process by which mRNA is decoded and translated to produce a polypeptide sequence, otherwise known as a protein. This method of synthesizing proteins is directed by the mRNA and accomplished with the help of a ribosome, a large complex of ribosomal RNAs (rRNAs) and proteins.
How would replanting trees impact the carbon cycle?
Answer:
It can reduce carbon in the atmosphere.
Complete the sentences. Each term may be used more than once.
a. In a circular bacterial chromosome, the structure of DNA is a____________ double helix.
b. If DNA is twisted in the_________ direction, it becomes overwound.
c. Overwinding results in____________supercoiling.
d. If DNA is twisted in the_________ direction, it becomes underwound.
e. Underwinding results in____________ supercoiling.
f. One effect of_________ supercoiling in bacterial chromosomes is to promote separation of the two strands of DNA in the double helix.
Answer:
The correct answer is -
1. right-handed
2. right-handed
3. positive
4. left-handed
5. negative
6. negative
Explanation:
In a circular bacterial chromosome, the structure of DNA is a right-handed double helix In a circular bacterial chromosome.
If DNA is twisted in the right-handed direction, it becomes overwound. Overwinding results in positive supercoiling takes place. If DNA is twisted in the left handd direction, it becomes underwound. Underwinding results in negative supercoiling.
f. One effect negative supercoiling in bacterial chromosomes is to promote separation of the two strands of DNA in the double helix
Which of the following sequences
(on one strand of a double stranded
DNA molecule) is likely to be a
cleavage site for a restriction
enzyme? Explain your answer.
a. CGTACC
b. ATGTCG
c. GATATG
d. TGCGCA
Answer:
✧･ﾟ: *✧･ﾟ:* *:･ﾟ✧*:･ﾟ✧
Hello!
✧･ﾟ: *✧･ﾟ:* *:･ﾟ✧*:･ﾟ✧
❖ The correct answer is D) two double-stranded DNA molecules, each composed of one and one old strand. This is known as semi-conservative replication.
~ ʜᴏᴘᴇ ᴛʜɪꜱ ʜᴇʟᴘꜱ!! ♡
~ HAZEL
What is something all eukaryotic cells have in common?
A.)All Cells are round
B.)All cells have a nucleus
C.)All cells have a cell wall
D.)All cells have cytoplasm
Answer:
We can immediately rule out option A, because not all cells are round. We can also rule out option C because not all cells have a cell wall. Animal cells, for instance, do not.
Can you choose more than one option? Because if so, the answers would be both B and D. All cells, no matter what type, have cytoplasm. Only eukaryotic cells have a true nucleus.
mention 10 most plant families in the world
10 most plant families in the world are÷
1)plant families-Iridaceae.
2)plant families-Asteraceae
3)Plant families – Scrophulariaceae.
4)Plant families – Saxifragaceae.
5)Plant families – Rosaceae
6)Plant families – Euphorbiaceae.
7)Plant families – Lamiaceae.
8)plant families-Rubiaceae
9)plant families-Orchidaceae
10)plant families-Fabaceae
How does mercury change from something benign to something harmful?
Answer:
Burning coal releases mercury into the atmosphere. It falls into sediments and is converted into methyl mercury by bacteria
Explanation:
Which statement accurately describes binary star systems?
Answer:
Which statements accurately describe binary systems?
1.have stars that might appear to wooble. 2)often have one star that is brighter than the other
I´ve done the quiz *SPOIL ALERT I ACE-IT*
Explanation:
I hope this helps
What would you look for in the geographic profile and
in the earthquake and volcano data to know if two
pieces of Earth's surface are moving toward each
other?
Answer:
You would look for there plate tectonics
Explanation:
I took the test
Earthquake, any sudden shaking of the ground caused by the passage of seismic waves through Earth's rocks.
The correct answer is tectonic plates movement
There are 7 types of tectonic plates and these are as follows:-
AfricanAntarcticEurasianIndo-AustralianNorth AmericanPacificSouth American.The scientist studies the seismography of the layers to find out the movement of the plates which lead to the earthquake.
Hence, the correct option is tectonic plates.
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Some roses have streaks of pink and streaks of red to give a striped effect to
their petals. Which inheritance pattern that you have read about today do you think
might be involved in the coloring of these roses? Explain.
Answer:
The correct answer is - incomplete dominance is the correct answer.
Explanation:
Incomplete dominance is the inheritance where there is no complete dominance takes place and where is the mix of both alleles trait mixes or blends in the offspring.
The red or purple cross with white plants flower cross the incomplete inheritance takes place to produce a striped effect to their petals.
Do environmental or genetic factors affect growth of organisms most?
Answer:
Examples of local environmental conditions could include availability of food, light, space, and water. Examples of genetic factors could include large breed cattle and species of grass affecting growth of organisms. The environment in which an organism lives plays an important role in modifying the rate and extent of growth. Environmental factors may be either physical (e.g., temperature, radiant energy, and atmospheric pressure) or chemical. Organisms and the cells of which they are composed are extremely sensitive to temperature changes; as the temperature decreases, the biochemical reactions necessary for life occur more slowly. A lowering of the temperature by 10° C (18° F) slows metabolism at least twofold and often more.
I copied this stuff from a bunch of different biology websites. It doesn't answer your exact question but I would have to say based on what I typed here it would be the environment that affects the growth of an organism more.
why do you think we should wear mask?
Answer:
So that we can limit the cases and keep safe :)
Explanation:
Answer:
masks slow the spread of the virus and or prevent you from catching the virus.