Which of the following does not represent a method by which cells regulate enzyme activity?
a. controlling the intracellular concentration of the enzyme
b. feedback inhibition of enzymes
c. the binding of allosteric regulators to allosteric sites on the enzyme
d. differential gene expression of the genes that produce enzymes
e. heat denaturation of the enzyme
E
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In the human genome, there are about how many genes?
a. 100 b. 200 c. 2,100 d. 21,000 e. 55,000
Plants obtain carbon from:
a. water b. carbon dioxide c. sugar d. oxygen e. glucose
Two parents are phenotypically normal, but one of their four biological children has a typical autosomal recessive trait. The other three children are phenotypically normal. It is very likely that:
A. if the affected child eventually marries a phenotypically normal spouse, all of their children will have the trait. B. the affected child is a boy. C. the parents are both heterozygous for the trait. D. the trait was expressed by one of the grandparents of the children. E. the affected child is a girl.
Why is perspiration an effective defense against microorganisms?
A) basic pH and low salt content B) basic pH, low salt content, and presence of lysozyme C) low salt content D) presence of lysozyme E) basic pH