The complement fixation test uses red blood cells as the target for complement activation. Test serum containing antibodies is combined with a known amount of antigen in a tube, and then the RBCs and antibodies against the RBCs are added. A positive result for the complement fixation test would be
A) a line of precipitate near the bottom of the tube.
B) a cloudy solution in the tube.
C) loss of color in the tube.
D) a fluorescent precipitate.
E) a solution that is clear due to precipitation of RBCs.
B
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The main photosynthetic area of a leaf is composed
of a. mesophyll. b. cortex. c. xylem. d. epidermis. e. none of these.
One form of hemophilia is caused by a sex-linked recessive gene. Assume that a man with hemophilia marries a phenotypically normal woman whose father had hemophilia. What is the probability that their first son will have hemophilia?
A) 1/2 B) 1/8 C) 3/4 D) 1/4 E) 1/16
Identify the following reaction: Lactose + H2O ? Glucose + Galactose
A) dehydration synthesis reaction B) hydrolysis reaction C) exchange reaction D) reversible reaction E) ionic reaction
Many antibiotics work by blocking the function of ribosomes. Therefore, these antibiotics will:
A) prevent the movement of proteins through nuclear pores. B) block RNA synthesis. C) block DNA synthesis. D) make the two nuclear membranes fuse into one. E) block protein synthesis.