Sensitivity to allergens
a. may be triggered by stress.
b. may be triggered by changes in air
temperature.
c. may be due to genetic predisposition.
d. may be triggered by a and b only.
e. may be due to genetic predisposition, and
may be triggered by stress and by changes
in air temperature.
E
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All types of internal fertilization require
A. specialized anatomical structures. B. physical joining of male and female. C. transfer of a spermatophore to the female reproductive tract. D. a terrestrial environment. E. both a terrestrial environment and accessory sex organs.
The above figure of a young cuckoo shoving its foster parents’ egg out of the nest best demonstrates _____
a. imprinting behavior b. instinctive behavior c. classical conditioning d. learned behavior e. operant conditioning
Mitotic Cdk-cyclin is active when it is
A) singly phosphorylated. B) acetylated. C) doubly phosphorylated. D) doubly methylated. E) cleaved by proteases.
The metamorphosis of a caterpillar into a butterfly is an example of
A) internal development. B) placental development. C) indirect development. D) direct development. E) external development.