Animals, like fiddler crabs, that are busiest at dawn or dusk are known as:
a. crepuscular.
b. nocturnal.
c. diurnal.
d. lunar.
e. asynchronous
a
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Four of the five habits listed below are common in
desert rodents. Select the exception. a. spend time in shade b. spend daytime hours in underground burrows c. active mainly at night d. generate less heat during day e. spend nighttime sleeping
Mendel’s experiments with pea plants yielded useful results because
A. pea plants exhibit continuous variation. B. pea plants exhibit a variety of inheritance patterns. C. pea plants show discontinuous variation and complete dominance. D. pea plants are sterile. E. more than one of these are correct.
The "BCM theory" hypothesizes that LTP is the result of presynaptic activation and (A)_________, whereas LTD is the result of presynaptic activation and (B)_______.
a. (A) weak postsynaptic activity, (B) strong postsynaptic activity b. (A) strong postsynaptic activity, (B) no postsynaptic activity c. (A) no postsynaptic activity, (B) weak postsynaptic activity d. (A) strong postsynaptic activity, (B) weak postsynaptic activity
Major histocompatibility antigens are
A) antigens that provoke allergic reactions. B) antigens that must be processed to be recognized by the immune system. C) antigens attached to foreign invaders. D) autoantigens involved in epitope recognition. E) not really antigens, but rather antibodies produced to mask foreign antigens.