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In the wild, male house finches (Carpodus mexicanus) vary considerably in the amount of red pigmentation in their head and throat feathers, with colors ranging from pale yellow to bright red. These colors come from carotenoid pigments that are found in the birds' diets; no vertebrates are known to synthesize carotenoid pigments. Thus, the brighter red the male's feathers are, the more successful he has been at acquiring the red carotenoid pigment by his food-gathering efforts (all other factors being equal). During breeding season, one should expect female house finches to prefer to mate with males with the brightest red feathers. Which of the following is true of this situation?a. Alleles that promote more efficient acquisition of carotenoid-containing foods by males should increase over the course of generations.b. Alleles that promote more effective deposition of carotenoid pigments in the feathers of males should increase over the course of generations.c. There should be directional selection for bright red feathers in males.d. Three of the statements are correct. e) Two of the statements are correct.
Determine what biological function do methylases perform in bacteria? What adaptive value do they have for a bacterium?
You are conducting field work and discover two groups of squirrels living on opposite sides of a lake. How would you plan a study to find out whether these two groups belong to the same species.
One of the experiments investigates the activity of V. harveyi BB170 and V. harveyi BB886 in the presence of 10 percent cell-free culture fluid from E.
Sarah, a twenty year old female premed student is rushed into the emergency room with complaints of fainting, seizures, fever, a headache and weakness.
Provide summary the structural organization of DNA. In your answer, be certain that you identify the chemical components of the molecule, and the arrangement of the molecule
Determine which of the following mechanisms of heat loss occur in a normal person when the environmental temperature is 105 degrees F and the relative humidity is less than 20 percent?
explain Why is it advantageous for citrate the product of reaction 1 of the TCA, to inhibit phosphofructokinase, which catalyses the third reaction in glycolysis.
Most of the genome does not code for protein, therefore 99% of the human genome is junk that serves no purpose?. With specific reference to examples long and short non-coding RNAs discuss whether you agree with this statement. In your answer you shou..
Which of the following is not an advantage of multicellularity?
Which is these represents the correct flow of energy through the photosynthesis and cellular respiration cycle? Which of the following is a similarity between photosynthesis and fermentation:
A line of mouse cells is growing for many generations in a medium with 15N. cells in G1 are then switched to a new medium that contains 14N.
Clostridium and Streptococcus are both catalase-negative. Streptococcus grows by fermentation. Why is Clostridium killed by oxygen, whereas Streptococcus is not.
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