The number of different alleles for ABO blood types
in the total human population is
a. 4.
b. 6.
c. 9.
d. undetermined.
e. 3.
Answer: e
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Many of the specific functions that are triggered when a cell passes one of the cell cycle checkpoints result from activation of enzymes and other proteins. A common mechanism for this activation is:
A. phosphorylation of specific proteins. B. signal transduction. C. polymerization of tubulin. D. ATP synthesis.
Which of the following is NOT accurate about the shoot apical meristem?
A. Its central zone maintains actively dividing cells. B. It gives rise to stems, leaves, and flowers. C. Its peripheral zone contains dividing and differentiating cells. D. It is found in the central region of the seedling. E. It has an organizing center that preserves the correct number of stem cells.
Beadle and Tatum used nutritional mutants called ____ to study the relationship between genes and proteins in
Neurospora.
a. transposons b. chaperones c. polysomes d. auxotrophs e. wild types
____ is one of the substances that maintains our blood pH between 7.35 and 7.45
a. Water b. Carbonic acid c. Hydrochloric acid d. Hydrogen peroxide e. Sodium hydroxide