Identical twins who __________ provide researchers with valuable information on the "nature-nurture question".
a. like the same things
b. grow up in the same place
c. were separated at birth
d. have different math aptitudes
Answer: c. were separated at birth
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After encountering an antigen, an animal has memory cells that can produce antibodies quickly. In the absence of the antigen
A) Memory cells die off. B) Memory cells don't produce antibodies at all. C) Memory cells produce few antibodies. D) Memory cells are totally inactivated.
If the human carpometacarpal thumb joint were a uniaxial hinge joint instead of a saddle joint...
a) the thumb would exhibit rotational movement. b) the ability to grasp and hold objects would be hindered. c) then sliding and twisting motions would become prominent. d) it would allow for abduction and adduction but not flexion and extension.
How would a molecule that mimics cAMP not affect an olfactory receptor?
A) It would increase sodium permeability. B) It would open chemically gated sodium channels. C) It would depolarize the olfactory receptor. D) It could trigger an afferent action potential. E) It would decrease sodium permeability.
Drugs that lead to birth defects in the formation of the limbs are most damaging when the conceptus is exposed to them during weeks
A. 1-2 of development, before the placenta is fully formed. B. 12-16 of development, when limbs have formed but are not fully mature. C. 4-8 of development, when limbs are undergoing peak development. D. 24-28 of development, when plasticity of surrounding tissues has been lost.