Some signaling chemicals, such at oligosaccharins, are only synthesized when a tissue is damaged
Indicate whether the statement is true or false.
T
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Some of the olfactory receptor (OR) genes in humans
A. have been inactivated, reducing our olfactory capabilities compared to other primates. B. have been activated, enhancing our olfactory sense compared to other primates. C. have duplicated more frequently, resulting in increased paralogs compared to other primates. D. have been conserved more rigidly, resulting in increased orthologs compared to other primates.
You are working with a gene associated with an essential pathway that is necessary at two time points in an organism's lifetime. With regard to gene regulation, you would expect the gene to be
A) not constitutive. B) associated with response to distinct events. C) "activated" by particular signals (induced). D) "turned off" by particular signals (repressed). E) all of the above
Although females prefer males with the longest tails, very long tails are typically not found
among males in their natural environment. Why might this be the case?
a. Male birds with very long tails are easily captured and eaten by predators, so they do not survive to reproduce. b. Male birds prefer having shorter tails. c. Mutations have kept tail lengths from increasing. d. There is no advantage to having increased tail length in the natural environment.
Which of the following is a coenzyme?
A) NAD B) NADP C) FAD D) CoA E) All are coenzymes.