Animals, vegetation, and other ancient organisms leave behind preserved remains called fossils.
How do fossils work?The preserved remnants of fauna and flora that were submerged in sediments like sand and mud beneath ancient seas, lakes, and rivers are known as fossils. Any preserved sign of life that's also typically older than 10,000 years is considered a fossil.
What are fossils known as?Fossils are the geologically altered remnants of a once-living organism and/or its activity. Body fossils—which depict the entire or a portion of the creature's body—and trace fossils—which show how the organism behaved.The preservation of many kinds of animals is made possible by the four basic types of fossils, each of which originated in a unique fashion.
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Abiotic factors are all of the non-living things in an ecosystem. What are some of the abiotic limiting factors in the scrub-jays population?
Answer:
Acorns, caterpillars, snakes, hawks, mates, shelter (if brush), blue jays
Explanation:
in a healthy cardiovascular system, the endothelium is very smooth and coated with , which prevents adherence of platelets to the endothelium. thus, unneeded blood clots do not form. multiple choice question.
Prostacyclin is the prostaglandin which prevents the adherence of platelets to the endothelium. This prevents blood clotting. Thus, the correct option is C.
What is Cardiovascular system?The Cardiovascular system or the blood circulatory system delivers nutrients and oxygen to all the cells in the body. Cardiovascular system consists of the heart and the complex network of blood vessels (arteries, veins, and capillaries) running throughout the entire body. The arteries carry blood away from the heart, the veins carry it back to the heart and the capillaries form the connection between arteries and veins.
Prostacyclin is a prostaglandin which is produced by both the vascular smooth muscle and endothelium cell layer that stimulates vasodilation, inhibits the smooth muscle growth i.e., antiproliferative effects, and also inhibits platelet aggregation.
Therefore, the correct option is C.
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Your question is incomplete, most probably the complete question is:
In healthy endothelial cells, Which of the following inhibits platelets from sticking together and forming a platelet plug.
a. Thromboxane
b. Von Willebrand factor
c. Prostacyclin
d. Epinephrine
What is the function of the dendrites?
a) They carry impulses towards the cell body.
b) They carry impulses away from the cell body.
c) They carry information into and out of the brain stem.
d) They carry motor and sensory signals between the spinal cord and the boc
Answer:
No C
Explanation:
they carry information into and out of the brain stem.
I hope it helps.
several epidemic microbial diseases of earlier centuries incurred high death rates because they resulted in severe dehydration due to diarrhea. today these diseases are usually not fatal because of the development of which of the following types of treatments?
The following types of treatments hydrating drinks with high concentrations of salt and glucose.
This is a passive process in which molecules move from areas of high concentration to areas of low concentration. Lysosomes serve as the cell's digestive system, breaking down materials ingested from outside the cell and helping to digest old components of the cell itself. Specific proteins are unique to each membrane.
Only certain membranes are composed of amphipathic molecules. Some membranes have a hydrophobic surface facing the cytoplasm, while others have a hydrophilic surface facing the cytoplasm. Water is a small, polar, charged molecule that readily diffuses across the plasma membrane. Small non-polar gases are hydrophobic and therefore easily pass through the plasma membrane.
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Suggest why leaves are green but roots aren’t
Answer:
plants and their leaves look green because the “special pair” of chlorophyll molecules uses the red end of the visible light spectrum to power reactions inside each cell. The unused green light is reflected from the leaf and we see that light.Leaves of plants are green because they perform photosynthesis while the roots are not because they do not perform photosynthesis is the best hypothesis based on the observation.
A mutation may affect the amino acid sequence of a polypeptide only if it occurs within the.
Only if it appears within the Result of repeated of a structural gene, the amino acid structure of a polypeptide.
Amino acids can I take every day?When used sparingly and in moderation, amino acids in particular are usually safe to eat daily. It is difficult to determine with certainty what the top limit for amino acid residues in general might be due to the large variations in dietary requirements across various persons.
When ought I to consume amino acids?Between meals and right after an exercise are often the two ideal periods for most individuals to take supplements of vital amino acids. Supplementing somewhere between meal may be particularly helpful for older persons to offset the greater rates of breakdown of proteins that come with age.
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which of the following are true regarding marine heat waves (mhws)?
A. Risk factors for death during heat waves are well defined.
B. Heat waves in recent years have been most severe near the equator, and mild in norther latitudes.
C. Heat wave preparedness planning is ineffective in reducing deaths during heat waves.
D. Heat waves are more severe in rural areas than in urban areas.
The true statement regarding marine heat waves (mhws) is that risk factors for death during heat waves are well defined.
So option A is correct.
What are marine heat waves?A marine heatwave is described as a period of abnormally high temperatures relative to the average seasonal temperature in a particular region of a sea or ocean.
Statistics in the United States has said that due to increased greenhouse gas emissions, extended periods of extreme warming in seas and oceans have increased in frequency by 50% in the past 10 years and are becoming more severe causing marine heatwaves.
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Which of the following is true regarding adolescence?
a. Boys start t0 spurt in height sooner than girls.
b. Most adolescents acquire plump and rounded body structure during adolescence.
c.Boys gain twice as much fatty tissue as girls.
d. Many adolescents relatively slender compared with their preadolescent stature
Most adolescents acquire plump and rounded body structure during adolescence.
Adolescence is the period of life between childhood and adulthood, lasting from the ages of ten to nineteen. It is a distinct stage of human development and a critical time for laying the groundwork for good health. Adolescents grow rapidly in terms of physical, cognitive, and psychosocial development.
Adolescence is defined by five characteristics: biological growth and development, an undefined status, increased decision making, increased pressures, and the search for self.
Adolescence is a life stage with unique health and developmental needs and rights. It is also a time to gain knowledge and skills, learn how to manage emotions and relationships, and acquire characteristics and abilities that will be useful in enjoying adolescence and assuming adult roles.
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At resting membrane potential, why does a small amount of sodium leak into the cell instead of out?.
A small number of sodium leaks into the cell instead of out due to the electrochemical gradient favors the entry of sodium into the cell while it is at rest. In the cell, the negatively charged ions and molecules are drawn to the positively charged sodium ions.
At a typical resting membrane potential, potassium is carried into the cells while sodium is pushed away. This necessitates the sodium-potassium exchange pump, which functions by using ATP. Every two extracellular potassium ions will be exchanged for three intracellular sodium ions.
An ATP-driven pump (Na/K-ATPase) causes the passage of potassium ions into the cell and sodium ions out of the cell to restore the proper balance of ions. When various ions pass across the neuron membrane, action potentials are produced. Sodium channels first open as a result of the stimulation.
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When you consider causes of behavior, which of the following are correctly matched? Ultimate causes? Proximate causes?
Ultimate causes: an evolutionary explanation for behavior.
Proximate causes: mechanisms that underlie behavior
In terms of the influences of evolution, ultimate causation explains features.
As an illustration, female animals frequently show preferences for male display features, including songs. The most conclusive theory is that females who exhibit preferences have more virulent or more handsome male progeny.
In terms of direct physiological or environmental elements, proximate causation describes how biological processes work.
Example: In a mate choice trial, a female animal decides to mate with a specific male. One theory for the closest explanation is that one male produced a stronger signal, which caused the female to have higher hormone levels and exhibit copulatory behavior.
Although the behavior in these two examples is the same, the explanations are based on several reasons, some of which are evolutionary and some of which are physiological.
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taxol is an anticancer drug extracted from the pacific yew tree. in animal cells, taxol prevents microtubule depolymerization, which interferes with which of the following processes?
A. the mitotic spindle
B. chromosome condensation
C. centriole duplication
D. cytokinesis
Answer:
Im Not 100% Sure But I'd Say Option:A "The Mitotic Spindle"
Explanation:
Worth A Try Hoped I HElped!
which of the following includes the largest number of species? answer correct animals that are unsegmented you were sure and correct animals with a body cavity animals with radial symmetry animals with a backbone animals that are segmented
Members of the Echinodermata are unsegmented, have bilaterally symmetrical larvae, and are radially symmetrical as adults.
Any member of the phylum Echinodermata is considered an echinoderm. Adults with radial symmetry include starfish, brittle stars, sea urchins, sand dollars, and sea cucumbers, as well as sea lilies or "stone lilies." They are spherical or elongated and have a star-like appearance. They are only found in the sea. The organisms have spiney skin. They are organized at the organ system level. They have a coelomic cavity and are triploblastic. Calcium carbonate makes up the skeleton. Echinoderms do not have a heart, brain, or eyes; instead, they move their bodies using a unique hydraulic system known as the water vascular system.
Sea stars, sea urchins, sea cucumbers, brittle stars, and feather stars are examples of echinoderms.
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Which of the following human impacts is mismatched with the detrimental effect it has had on a biome?
A. Oil and natural gas exploration: long-lasting injury due to slow regeneration of the tundra
B. Mining, drilling for gas and oil, and farming: loss of boreal forest (deforestation)
C. Overharvesting of old-growth forest: loss of temperate rain forest habitat for endangered and threatened species
D. Off-road vehicle damage and military exercises: erosion and loss of vegetation in the desert
E. Hunting and fishing: desertification of the savanna, tropical grasslands
Local hunting and fishing can result in local extirpations and drive species to extinction. Wildlife populations have declined in forests throughout the tropics due to hunting.
What is a biome?
It is an area where species live in that location. Each biome has a unique temperature range, soil type, and amount of light and water.
Terrestrial biomes include grasslands, deserts, and tropical forests
Freshwater biomes include polar freshwaters, large lakes, tropical and sub-tropical coastal rivers.
Marine biomes include continental shelves, tropical coral, and kelp forests.
Excessive heat and droughts result from an increased average global temperature and contribute to the desertification of the savannas.
Threats to biome:
aquatic pollutionintroduction of invasive speciesfloods and droughtsdesert-pollution damagewildfiresloggingHence hunting and fishing causes local extirpations and drive species to extinction.
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Giant tube worms living near vents on the ocean floor do not have a functioning intestine. Instead they have a modified gut full of bacteria that provide the worms with carbohydrates. What is the energy that the bacteria use to make the carbohydrates?.
In giant tube worms, symbiotic bacteria are housed in an organ called a trophosome. Because the symbiotic bacteria dwelling in the trophosome may supply organic nutrients and other chemicals for energy and growth, this organ replaces its digestive system.
Instead of having a mouth, a gut, or an anus, the worms obtain their sustenance from symbiotic bacteria that use hydrogen sulfide and energy to fix carbon to produce the food that the worm consumes.
Red plumes that resemble feathers on the tubeworms serve as gills, taking in oxygen from the sea and hydrogen sulfide from vent fluids. They can do this because of a unique form of hemoglobin in their blood that can carry oxygen and sulfide simultaneously (human hemoglobin transports only oxygen).
So, we can define a trophosome as an organ that houses symbiotic bacteria in tube worms. The symbiotic bacteria can produce organic nutrients and other compounds for energy and growth.
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Dr. Ara B. Dopsis and Dr. C. Ellie Gans are performing genetic crosses on daisy plants. They self-fertilize a blueflowered daisy and grow 100 progeny plants that consist of 55 blue-flowered plants, 22 purple-flowered plants, and 23 white-flowered plants. Dr. Dopsis believes this is the result of segregation of two alleles at one locus and that the progeny ratio is 1:2:1. Dr. Gans thinks the progeny phenotypes are the result of two epistatic genes and that the ratio is 9:3:4.
The two scientists ask you to resolve their conflict by performing chi-square analysis on the data for both proposed genetic mechanisms:
1. Calculate the chi-square value for hypothesis of segregation of two alleles at one locus.
2. Calculate the chi-square value for hypothesis of interaction of two epistatic genes.
3. Based on chi-square analysis, what is your conclusion regarding these two genetic hypotheses?
4. Based on chi-square analysis, what is your conclusion regarding these two genetic hypotheses?
a. Hypothesis of segregation of two alleles at one locus can be rejected.
b. Hypothesis of interaction of two epistatic genes can be rejected.
c. Neither hypothesis can be rejected.
d. Both hypotheses can be rejected
1. The blue color flower is self-crossed with each other and gives rise to 100 progenies.
2. Out of 10p progeny 22 are purple 55 are blue color and 23 are white color.
3. When the gene shows segregation the chi-square value is as:-
So, the Chi-square value is 1.02 for the hypothesis of the segregation of two alleles.
4. When genes show epistatic:
So, the chi-square value for the hypothesis of the interaction of the twp epistatic gene is 0.750.
The statistic is used in genetics to indicate whether there are deviations from the expected outcome of alleles within a population. A common assumption in statistical tests is that there is no significant difference between the measured and predicted results. Epistasis is determined by the self-progeny of F2 animals. Gene B is epistatic to gene A if animals of phenotype A produce offspring of phenotypes A and B, and animals of phenotype B produce only offspring of phenotype B.
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how can you describe deep sea trench
An ecologist makes a list of every species known to exist in an ecosystem. Which type of biodiversity is he/she studying?
Responses
ecosystem diversity
genetic diversity
species diversity
biosphere diversity
Which of the following arrangements would yield the greatest reduction in gamete viability?
A. An inversion homozygote for a small inversion
B. An inversion heterozygote for a large inversion
C. An inversion homozygote for a large inversion
D. An inversion heterozygote for a small inversion
An inversion heterozygote for a large inversion
In order for the chromosomal pairs to line up during meiosis, an inversion heterozygote must create a loop with one chromosome. Note that the term "heterozygote" used here refers to chromosomes rather than genes. Even with an inversion heterozygote, all of its genes could still be homozygous. Due to the loss of half of their gametes, inversion heterozygotes do not have as high a level of fitness (underdominance) as non-inverted people.
More genes will be duplicated or deleted when there is a crossing over if the heterozygous inversion is big. In the majority of pericentric inversion heterozygote carriers with balanced rearrangement, there is no phenotypic effect. The homologous chromosomes in an inversion heterozygote pair gene by gene and form a loop configuration that can be seen at pachytene if the inverted region is large enough.
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Explain how heart attack survivors get out of breath easily (6 marks)
Heart attack survivors get out of breath easily because the heart did not work properly.
Why do cardiac patients get short of breath?
If your heart is not pumping enough oxygen-containing blood into the body, your body reacts by breathing faster to get more oxygen into the body, making us feel short of breath. Heart attacks have caused great damage which means the heart can not pump blood to all parts of the body. This can leads to heart failure, which can include the symptoms of breathlessness.
Shortness of breath is a symptom of the problems with the heart and lungs. But it can also be a symptom of other conditions such as asthma, allergies, and anxiety. Intense exercise or having a cold can also lead to breathless.
So we can conclude that the heart did not work properly which leads to heart attack survivors getting out of breath easily.
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lipolysis increases when which of the following are released: 1) cortisol, 2) epinephrine and norepinephrine, 3) glucagon, 4) growth hormone.lipolysis increases when which of the following are released: 1) cortisol, 2) epinephrine and norepinephrine, 3) glucagon, 4) growth hormone.
Lipolysis increases when the following hormone is released (1) cortisol.
Lipolysis is the process of breakdown of lipids triglycerides. In this process, the triacylglycerols breakdown by the phenomenon of hydrolysis into their monomeric units glycerol and free fatty acids. The process can happen in all cell types, but the white and brown adipose tissues are more prominent for lipolysis.
Cortisol is a hormone also known as the stress hormone. It is steroidal in nature. The adrenal glands are responsible for the secretion of these hormones. It elevates the blood pressure of the body and also enhances the energy levels.
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the gene for enzyme transposase is carried by
Answer:
The gene for enzyme transposase is carried by a plasmid.
Suppose that your pressure gauge for determining the blood pressure of a patient measured absolute pressure p instead of gauge pressure. How would you write the normal value of systolic blood pressure, 120 mmhg, in such a case?.
The value of the systolic blood pressure is -640 mmHg. The pressure gauge measures the absolute pressure.
Blood pressure is known as the pressure of blood against the wall of the arteries. Systolic blood pressure indicates how much pressure the blood is exerting against the artery walls when the heart beats pumping blood out. Systolic blood pressure is the top number of the blood pressure reading.
According to the question, we can see that the gauge pressure measures the absolute pressure that is 'P'.
Therefore, P= 120 mmHg
And we know that,
Absolute pressure = gauge pressure + atmospheric pressure.
P = Pg +Patm
where, P = absolute pressure
Pg = gauge pressure
Patm = atmospheric pressure.
Since we need to find 'Pg'. We have to minus 'Patm' from 'P'.
Therefore, the equation will be:
Pg = P - Patm
Pg = 120 -760 (the value of atmospheric pressure is 760 mmHg)
Therefore, Pg = - 640 mmHg.
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All of the following will cause DNA replication to occur faster except for ___?
A.) More DNA polymerases
B.) More helicases
C.) More nucleotides
Which letter is it? A, B, or C?
All of the following will cause DNA replication to occur faster except for More helicases.
Numerous DNA polymerase enzymes are working simultaneously to duplicate the complete DNA at all of the various replication forks in the various replication bubbles in order to hasten the process. Two exact copies are the outcome.
The rate of eukaryotic human DNA replication is 50 nucleotides per second. Because several polymerases can create two new strands at once utilizing each unwinding strand from the original DNA double helix as a template, replication happens so swiftly in both circumstances.
One strand from the parent strand and one recently synthesized daughter strand are present in every new piece of DNA. Semiconservative replication is the term for this.
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can be defined as an interaction between organisms or species, in which the fitness of one is lowered indirectly by the presence of another due to limited resource such as food, water, and space.
This type of inetraction between organisms called intraspecific completetion.
Intraspecific competition is competition between individuals of the same species (interspecies). The impact of competition on each individual within a species depends on the type of competition taking place. "Competition-competition" can be passive or active, with different results.
For example, two male birds of the same species may compete for mates at the same location. This type of competition is a fundamental element of natural selection. It leads to the development of better adaptations within the species.
A species is a group of organisms made up of similar individuals whose genes can be exchanged or interbred. Species is the primary natural taxonomic unit, ranked under the genus and represented by the Latin binomial.
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All of the following bacteria are gram-positive. Which does NOT belong with the others? A) Actinomyces B) Mycobacterium C) Listeria D) Corynebacterium
The correct choice is Mycobacterium. Mycobacterium is a genus of actinomycetes with its own family, Mycobacteriaceae. More than 190 species are recognized in this genus.
Mycobacterium abscessus is a distantly related bacterium that causes tuberculosis and leprosy. It is known to contaminate medicines and products, including medical devices. More than 190 species are recognized in this genus. This genus includes pathogens known to cause serious illness in mammals, such as tuberculosis and leprosy in humans.
Mycobacteria have an outer membrane. They have no capsule and most do not form endospores. Distinguishing features of all Mycobacterium species are that their cell walls are thicker, hydrophobic, waxy, and rich in mycolic acids/mycolate than many other bacteria.
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The compounds α-D-fructofuranose and β-D-fructofuranose are ________.
A) enantiomers
B) mutamers
C) anomers
D) conformational isomers
The compound of α-D- fructofuranose and β-D-fructofuranose are anomers. Correct option is (C).
A new chiral center is created at the site of the conversion of a molecule like glucose into a cyclic form C-1. The new chiral center (C-1) is produced by the anomeric carbon, which is identified by its chemical structure. Anomers are an exception; they are epimers with only the anomeric carbon varying in configuration.
An example of an anomer is -D-glucose and -D-glucose.
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which of the following does not describe the anatomical characteristics of the kidney? a. partially tucked under the ribs for protection b. protected by the perirenal fat capsule c. anterior to psoas major d. located in a retroperitoneal position e. left kidney is below the right kidney
"left kidney is below the right kidney" does not describe the anatomical characteristics of the kidney.
What is anatomical characteristics?The human body is made up of billions of smaller structures of four primary types: cells, tissues, organs, and systems. An organ is a grouping of several different types of tissues that work together to accomplish a certain function. The body is erect, squarely facing the spectator, feet flat and front in the anatomical posture. All definitions presented here assume that the human skeleton is in conventional anatomical posture, i.e., standing erect, gazing ahead, feet near and parallel to each other, arms at sides, palms facing front.
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Which of the following would you not find in normal cerebrospinal fluid?a. Potassium
b. Glucose
c. Protein
d. Red blood cells
Answer:
d. Red blood cells is the correct answer
Which of the following terms associated with transcription describe regions of nucleic acid?
a. terminator
b. gene
c. promoter
Promotor, gene, terminator are all 3 phrases/terms related to transcription. Promoters and terminators are stretches of DNA upstream and downstream (respectively) of genes that manage each the fee at which the gene is transcribed and the fee at which mRNA is degraded.
As a result, each of those factors manage internet protein expression from a artificial construct. The terminator series in DNA includes a 20 basepair GC-wealthy area of dyad symmetry observed through a quick poly-A tract or "A stretch" that is transcribed to shape the terminating hairpin and a 7–nine nucleotide "U tract" respectively. This is the area this is transcribed through RNA polymerase, additionally referred to as the RNA coding area. As defined below, it can consist of introns, sequences which are eliminated from the mature RNA molecule throughout RNA processing.
The transcribed area is demarcated through promoter and terminator sequences. A promoter is a area of DNA wherein RNA polymerase starts offevolved to transcribe a gene. Normally, promoter sequences are generally placed at once upstream or on the 5′ quit of the transcription initiation site.
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hydrophilic substances have an easier time passing through membranes than do hydrophobic substances.
Membranes can be crossed by hydrophilic substances more easily than by hydrophobic ones. Proteins that enter a membrane from both sides frequently puncture it.
Why does water become hydrophobic?Water's polarity and its ability to create strong hydrogen bonds with other polar molecules are what lead to the hydrophobic interactions. The polarity of water makes it simple for it to create hydrogen bonds with the other polar molecules, which makes it possible for it to dissolve additional polar molecules.
What liquids are hydrophobic?Among the hydrophobic molecules are those that can be found in aromatics, oils, fats, and other typically greasy substances. Hydrophobic materials are employed in the removal of oil from water, the cleanup of oil spills, and chemical separation techniques to separate polar molecules from non-polar ones.
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