The adrenal medulla produces hormones in response to
A) stress or exercise.
B) light.
C) signals from the posterior pituitary.
D) reduced blood levels of thyroxine.
E) signals from the anterior pituitary.
A
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Which of the following processes is unique to the retroviral information flow within a cell?
A) RNA ? protein B) protein ? DNA C) RNA ? DNA D) DNA ? RNA E) protein ? RNA
Viruses can ________ only after they have entered a host cell, and only by using the host's cellular machinery.
Fill in the blank(s) with the appropriate word(s).
Organisms with true radial symmetry
A) have their sense organs, mouth, and brain clustered in the head. B) tend to be highly mobile. C) do not have a distinct head region and tend to be sedentary or passive drifters. D) can be divided into two matching halves along only one plane.
If it is too cold, then the ___ keeps the tail of the phospholipids from getting too close.
a. Glycoproteins b. Transport proteins c. Surface (peripheral proteins) d. Cholesterol