The relationship between what two ions determines the blood's pH?
A. Hydrogen and sodium
B. Carbon dioxide and sodium
C. Hydrogen and bicarbonate
D. Sodium and hydrogen
Answer: C
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Which of the following statements is NOT true?
a. The more complex a foreign molecule the greater its antigenicity. b. Isolated molecules may act as antigens. c. Large polysaccharides may act as antigens. d. T cells reside in colonies. e. The key to B- and T-cell specificity is the TLRs present in their membrane thatbinds antigens.
A single lobe of a kidney is comprised of ________.
A. one collecting duct and all nephrons that drain into it B. one major calyx and all of its minor calyces C. a renal medulla and two renal columns D. two calyces and a renal pelvis E. one pyramid and the overlying cortex
When innate immunity is activated,
A. each exposure is very specific. B. previous exposures are remembered. C. each exposure produces the same response. D. each exposure increases the strength of the immune response. E. the second exposure does not produce a response.