In all chordates, the notochord
A) appears only in adults.
B) appears only during early stages of development.
C) is found throughout the life cycle.
D) may or may not appear at all; it is not found in all chordates.
E) appears at least during early stages of development.
E
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Andalusian chickens with the genotype CBCB are black, those with the genotype CBCW are gray. What is the relationship between the CB and the CW alleles?
A) CB is dominant to CW. B) CB is recessive to CW. C) CW is dominant to CB. D) The relationship is one of incomplete dominance. E) CB and CW are codominant.
Most mammals, most cartilaginous fish, some amphibians, and a few reptiles have young developing within the female and obtaining nutrients from her blood, a relationship known as ________.
Fill in the blank(s) with the appropriate word(s).
The refractory period of a neuron plasma membrane is important because
a. it establishes the resting potential. b. it initiates an action potential. c. it ensures that the threshold potential will be reached. d. it ensures that an impulse will travel in a one-way direction. e. in resets the threshold potential.
Which of the following can affect enzyme
activity?
a. temperature change b. pH change c. changes in salt concentrations d. regulatory molecules e. all of these