Frameshift mutations (select all that apply)
A. cause the insertion or deletion of a single
amino acid from the polypeptide chain.
B. result in premature stop codons.
C. change the entire amino acid sequence
downstream from the site of the insertion or
deletion.
D. are known risk factors in most forms of
cancer, including breast and colon cancer.
E. are known risk factors in breast cancer, but
not colon cancer.
C
You might also like to view...
The level of depolarization at which an action potential will be triggered is referred to as the
A. resting potential. B. membrane potential. C. cationic potential. D. refractory potential. E. threshold potential.
When two or more separate mutlicellular algae stages occur in succession during the life cycle, we call this:
a. gametangia. b. fragmentation. c. sporangium. d. alternation of generations.
The influence of genetic drift on allele frequencies increases as
a. gene flow increases. b. population size decreases. c. mutation rate decreases. d. the number of heterozygous loci increases. e. population size increases.
There are cases, particularly in fruit flies, in which a normal body part grows in the wrong spot. For instance, legs on the head growing instead of antennae, or a second set of wings behind the normal pair. What can explain this?
A. These are due to misregulation of hormones from environmental contamination with pesticides. B. These naturally occur sometimes in animals that have metamorphic development, due to different organization of homeotic gene expression in larvae versus adults. C. These occur as a result of mutations in homeotic genes, which normally act to direct development along the anterior-posterior axis. D. These are due to the reappearance of stem cells, which are totipotent.