A scientist wants to determine whether a mutant phenotype is due to the loss of gene C or gene D, which are both deleted in a mutant fly with abnormal eyes. Mutant flies with transgenic gene C have wild-type eyes, whereas mutant flies with transgenic gene D have abnormal eyes. What can be concluded from these results?
A) Either gene C or gene D is required for normal eye development.
B) Both gene C and gene D are required for normal eye development.
C) Gene C is required for normal eye development.
D) Gene D is required for normal eye development.
C) Gene C is required for normal eye development.
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You begin an experiment with two populations of E. coli that are each composed of 100 cells. The cells are all genetically identical (i.e., they are clones). You grow them up in flasks on a lab bench under identical conditions with unlimited resources
After 10,000 generations, you analyze the genome of each population. Do you expect the genomes of each population to be identical after 10,000 generations? A. Yes, because the starting populations were genetically identical. B. Yes, because resources were unlimited. C. No, because mutations will accumulate independently in each population. D. No, because natural selection was not a factor at any point in this experiment. E. No, because mutation and natural selection (once genetic variation is present) were factors in this experiment.
Most antihelminthic medications act only against the pathogens, not the human host.
Answer the following statement true (T) or false (F)
When the coronary arteries become narrowed and blood flow to the heart is reduced, a person may experience cramping chest pain upon exertion, prior to a heart attack or death of cardiac muscle tissue. This condition is called ________.
Fill in the blank(s) with the appropriate word(s).
Which of the following does not provide molecular evidence for evolution?
A) The 1,000-fold differences in nonsynonymous substitutions between some genes B) The existence of pseudogenes C) The fact that high-expression genes use amino acids that are less energetically costly than those used by low-expression genes D) The fact that there is a lower rate of nucleotide substitutions in coding regions than in noncoding regions of genes E) All these are molecular evidence for evolution