Which of the following is an example of exaptation?
A) Some insects do not develop wings when resources are plentiful.
B) Human middle ear bones are derived from ancestral gill arch tissue.
C) Wings of bats and wings of birds are homologous.
D) Mutation rates can increase at higher temperatures.
Answer: B
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A hydrocarbon skeleton is covalently bonded to an amino group at one end and a carboxyl group at the other end. When placed in water this molecule would function _____
A) only as an acid because of the carboxyl group B) only as a base because of the amino group C) as an acid and a base D) as neither an acid nor a base E) It is impossible to determine how it would function, based on the provided information.
As a transcription factor, Pax6:
A. targets the approximately 2000 genes needed for eye development. B. binds to the 3' regulatory elements of its target genes. C. activates its target genes. D. represses its target genes. E. activates some target genes and represses others.
When a limiting factor becomes more important as the size of the population increases, it is known as a(n)
A. biotic potential. B. density-independent limiting factor. C. density-dependent limiting factor. D. intrinsic factor.
Why do all enzymatic reactions need activation energy?
a. Energy is required to disrupt a substrate's stable electron configuration. b. Energy allows only the substrate to bind. c. Energy is needed for the enzyme to find its substrate. d. Energy is required by an enzyme so that it can be reused.