When mast cells degranulate and release histamine, which of the following events may occur?
A) constriction of small blood vessels
B) bronchial spasms
C) increased mucus production
D) both constriction of small blood vessels and bronchial spasms
E) both bronchial spasms and increased mucus production
E
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What is thought to be a consequence of the increased oxygen (O2) in the atmosphere during and after the Silurian Period?
A. Conquest of land by arthropods. B. Conquest of land by arthropods and vertebrates. C. Increases in animal body sizes and conquest of land by plants. D. Conquest of land by arthropods and vertebrates, and plants. E. Conquest of land by arthropods and vertebrates and an increase in animal body sizes.
An oral contraceptive pill contains ____
a. estrogen only b. progesterone only c. FSH d. LH e. estrogen and progesterone
The seeds of fleshy fruits are most likely to be spread
by a. animals. b. water. c. wind. d. propulsion from the plant. e. none of these.
A mutagen has introduced a frame-shift mutation by adding one nucleotide base. Which of the following could be a reversion mutation for this particular mutant?
A) deleting 2 bases only B) adding 1 base only C) deleting 1 base or adding 1 base D) deleting 1 base or adding 3 bases E) deleting 1 base or adding 2 bases