B cells differentiate in the ____, while T cells mature in the ____
a. bone marrow; thymus
b. thymus; bone marrow
c. bone marrow; bone marrow
d. bone marrow; blood
e. blood; thymus
ANSWER: a
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If a mutation occurred in the cadherin gene so that the cytoplasmic domain no longer attached to the cytoskeleton, which of the following would occur?
A. Cadherins in desmosomes would no longer be anchored to intermediate filaments. B. Cadherins in adherens junctions would no longer be anchored to microtubules. C. Cadherins in hemidesmosomes would no longer be anchored to intermediate filaments. D. Cadherins in desmosomes would no longer be anchored to microfilaments.
Failure to refrigerate a urine culture specimen when a long time will elapse between specimen collection and delivery to the laboratory is most apt to result in:
A) an abnormally high colony count B) an abnormally low white blood cell count C) contamination of the specimen by members of the patient's indigenous microflora D) death of the pathogen
The two amino acids depicted above both have side groups (R groups) that are ____
a. acidic and polar b. uncharged and nonpolar c. basic and polar d. acidic and nonpolar e. uncharged and polar
Which component of the earth's atmosphere is decreased due to photosynthesis?
A) ozone B) oxygen C) hydrogen peroxide D) carbon dioxide