Fluid inside most human cells is about
a. pH 7.
b. pH 9.
c. pH 4.
d. pH 11.
e. pH 2.
A
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Among the actions listed below, which are involved in PCR, and in what order? Extension Initiation Denaturation Termination Annealing
A. Initiation, extension, termination B. Denaturation, annealing, extension C. Denaturation, extension, termination D. Initiation, denaturation, extension E. Annealing, initiation, termination
If its cells are striated and fused at the ends so that the cells contract as a unit, the tissue is:
a. smooth muscle b. dense fibrous connective c. supportive connective d. cardiac muscle e. skeletal muscle
How are humans able to produce billions of unique B and T cell receptors?
a. Each time a pathogen is encountered, a new receptor is produced. b. The two different genes that encode receptor proteins, allow for many versions of receptors to be produced. c. Random splicing of gene segments encoding receptor proteins allows for 2.5 billion potential combinations. d. Antigen presenting cells stimulate B and T cells to each produce billions of receptor molecules. e. There are billions of B and T cells, each of which produces a single receptor on its cell surface.
Which drug exerts its effect by weakening the cell wall until the bacterial cell is lysed?
A. Linezolid B. Vancomycin C. Bacitracin D. Rifampin