What is the most important role of bacteria in the environment?
A) as disease-causing agents
B) as fungal control
C) as decomposers
D) as a source of restriction enzymes
C
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Which of the following is not true of the ? helix?
A. The ? helix forms a right-handed spiral. B. Amino acid R groups point toward the helical axis. C. The hydrogen bonds of an ? helix all point in the same direction. D. A typical protein contains about one-third ? helix. E. All of the answers given are correct.
Which statement concerning root hairs is not correct?
A. Root hairs are tubular extensions of individual epidermal cells. B. A root hair is isolated from its epidermal cell with a cross wall. C. Root hairs generally live only a few days before being sloughed off. D. Root hairs increase the absorption of water and minerals. E. Root hairs are located in the zone of maturation of a root.
A patient enters your clinic with a suspected helminthic infection. In support of this diagnosis, you suspect elevated levels of which antibody in the patient's serum?
A. IgE B. IgG C. IgM D. IgD
What is typically the result of receptor up-regulation?
a. A hormone's signal is amplified. b. The number of receptors decreases. c. The sensitivity of a cell to a hormone decreases. d. The number of genes that code for a receptor increases. e. The concentration of hormone molecules in the blood increases