Genetic drift is more likely to occur in ________
a. large populations
b. heterozygous populations
c. any population
d. homozygous populations
e. small populations
e
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The fact that humans have a relatively large number of mutations per genome per generation when compared to other organisms can be explained by:
A. humans are so complex we have multiple proteins doing the same job. B. human cells don't divide as often as those of other organisms. C. most of a human's DNA is noncoding, so most of the mutations are neutral. D. most of these mutations happen after reproduction, so they wouldn't be selected against. E. humans have multiple proteins doing the same job, and our cells don't divide as often as other those of other organisms.
Select all events that occur during the follicular phase (first half) of the ovarian cycle.
Which of the following is almost always associated with being overweight and underactive?
A) type 1 diabetes B) type 2 diabetes C) type 3 diabetes D) hypoglycemia
Radioactive isotopes of various elements can be used to label molecules for use in studies of metabolic pathways. For example, 14C is a radioactive isotope of carbon and naturally occurs at much lower rates than non-radioactive 12C (i.e. most molecules
contain 12C carbon atoms). A cell can be fed a nutrient molecule labeled with the radioactive isotope and scientists can detect where the radioactive isotope ends up. For each of the following scenarios, trace the radioactive isotope to where it ultimately would end up after moving through the cellular respiration, fermentation, or biosynthetic pathways. Only consider these metabolic pathways; do not consider any other cellular processes. A. E. coli is fed 14C-labeled glucose and grown under aerobic conditions. B. E. coli is fed 14C-labeled glucose and grown under anaerobic conditions (fermentation). C. E. coli is fed 14C-labeled fatty acids and grown under aerobic conditions. D. E. coli is fed 14C-labeled acetyl CoA and grown under conditions that promote biosynthetic pathways. What will be an ideal response?