Mast cells release what during an allergic reaction?
a. prostaglandins
b. glycoproteins
c. histamine
d. glucosamine
c. histamine
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Which of the following does not describe an aspect of the three-dimensional structure of the DNA helix?
A. The deoxyribose has the C-2' endo conformation, which defines the distance between adjacent phosphate groups. B. The hydrophilic backbone of the alternating sugar and phosphate groups is on the outside of the helix. C. The nearly planar and hydrophobic bases are stacked inside the helix relatively perpendicular to the backbone. D. Additional stability is conferred by the hydrogen bonding between the complementary bases. E. All of these choices correctly describe the structure of the DNA helix.
If blood type “Y” is given to recipient __________,
the recipient will suffer an agglutination reaction. a. “W” b. “X” c. “Y” d. “Z” e. “W” or “X”
Most adipose tissue is located
a. just beneath the skin. b. in the abdominal cavity. c. surrounding organs. d. in the digestive tract. e. in all of these locations
What is one of the cellular differences between human eggs and sperm?
A) Sperm are arrested in meiosis II; eggs have completed meiosis. B) Sperm contain a haploid set of chromosomes; eggs are diploid. C) Sperm have 200,000 times the volume of eggs. D) Eggs have 200,000 times the volume of sperm. E) Sperm are arrested in meiosis I; eggs have completed meiosis.