What is the optimum pH of most enzymes?
a. 1
b. 3
c. 5
d. 7
e. 9
ANSWER: d
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Human sweat has antimicrobial activity due to
A. production of an antimicrobial peptide called cathelicidins. B. production of low molecular weight compounds that chelate free iron. C. production of low molecular weight compounds that maintain an alkaline pH. D. competition with normal sweat gland flora.
All of the following are true regarding ammonia
EXCEPT that a. it is toxic to cells. b. it is a normal product of amino acid breakdown. c. the liver detoxifies it. d. the liver converts it to urea. e. it is expelled by the respiratory system.
A decrease in the overfishing of herring and perch would have prevented the decimation of the kelp beds along the west coast of the U.S.
Answer the following statement true (T) or false (F)
Genetic material of a cell is inside the
a. cytoplasm b. nucleus c. organelle