The major histocompatibility complex is important in a T-cell's ability to:
A. recognize specific viruses.
B. recognize self from nonself.
C. recognize specific parasites.
D. recognize specific bacteria.
Answer: B
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The anterior pituitary secretes more ACTH, leading to more glucocorticoids in plasma, which causes the anterior
pituitary to then secrete less ACTH. This is an example of ____ regulation.
a. amplification only b. positive feedback only c. negative feedback d. cascading feedback e. both amplification and positive feedback
Members of this lineage are highly active, have a closed circulatory system, and have a high oxygen
requirement.
a. Cephalopoda b. Polyplacophora c. Bivalvia d. Gastropoda e. Scaphopoda
Which white blood cell type is usually the first
to encounter an invading pathogen?
a. B cell b. T cell c. macrophage d. natural killer cell e. basophil
Suppose a phage infected a protease-deficient bacterial cell. Would the lytic or lysogenic life cycle be favored? Why?
What will be an ideal response?