Cluster-of-differentiation antigens are found on
A) B cells, where they determine the antibody types that are made.
B) B cells, where they make recognition of self antigens on macrophages possible.
C) T cells, enabling them to recognize foreign antigens on macrophages.
D) macrophages, enabling them to link with both B and T cells.
C) T cells, enabling them to recognize foreign antigens on macrophages.
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The collective term for the organisms living on or in the human body is
A) normal microbial flora. B) fomite flora. C) transient microbial flora. D) pathogenic flora.
It is the morning of a big test. You are very nervous about it. Your heart is racing and your blood pressure is increased
You are feeling the effects of the ____ division of the ____ nervous system.
a. parasympathetic; autonomic b. parasympathetic; somatic c. sympathetic; autonomic d. sympathetic; somatic e. autonomic; somatic
Estimates of HANPP range around 20 percent, yet what percent of total heterotrophic biomass do humans make up?
A) 20 percent B) 50 percent C) 10 percent D) less than 1 percent
If complementary DNA strands were arranged in a parallel manner, what would you expect to see?
A) Complementary nucleotides would be attracted to each other, forming ionic bonds that would make the helix stable but not uniform in width. B) Charges of complementary nucleotides would repel and no hydrogen bonds would form. C) Complementary nucleotides would line up properly; but fewer hydrogen bonds would form, so the strands could be more easily pulled apart. D) Purines would pair with both purines and pyrimidines due to the closer alignment of the parallel strands. E) There would be no discernable difference between DNA strands aligned in a parallel versus an antiparallel manner.