Class II MHC proteins are present in the plasma membrane only when
A) a helper T cell has engulfed an antigen.
B) an antigen-presenting cell has engulfed and is processing an antigen.
C) a virus-infected cell secretes interferons.
D) a cancerous cell gets attacked by NK cells.
E) the body cells are healthy.
B
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Which of the following does not contribute to skin color?
A. Hemoglobin B. Melanin C. Keratin D. Carotene E. All of the choices contribute to skin color.
Cortisol can bind to both the glucocorticoid receptor and the mineralocorticoid receptor. In the cells of the distal nephron, cortisol is prevented from binding to the mineralocorticoid receptor by:
A. competitive inhibition by aldosterone B. glucuronide conjugation C. conversion to cortisone D. rapid excretion E. binding to heat shock chaperone proteins
Neurotransmitter action is usually brief because neurotransmitters, such as acetylcholine, are _________________
Fill in the blank(s) with the appropriate word(s)
Modified and specialized sweat glands that produce milk are called ________ glands.
A) ceruminous B) apocrine sweat C) sebaceous D) merocrine sweat E) mammary