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

Biology & Microbiology

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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.

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology

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.

Biology & Microbiology