Which of the following statements about cyclin B is false?
a. It is a component of MPF.
b. It accumulates throughout S and G2.
c. It activates Cdc2 protein kinase.
d. It cycles between active and inactive states in the cell cycle.
Ans: d. It cycles between active and inactive states in the cell cycle.
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Which of the following actions occurs in many plants when CO2 concentrations are high?
A. CAM photosynthesis fixes CO2 at night. B. Water evaporates at a higher rate than usual. C. Guard cells lose turgor, and the stomata close. D. Calcium ions are transported faster through the phloem. E. Oxygen is used by plants for photosynthesis.
Males that tend to be taller than normal with an otherwise normal phenotype have which chromosomal makeup?
a. XX b. XO c. YY d. XXX e. YYY
The phenotype of an individual:
a. depends at least in part on the genotype. b. is either homozygous or heterozygous. c. determines the individual's genotype. d. is the genetic constitution of the organism. e. is either monohybrid or dihybrid.
The epiglottis is a
A) muscle that moves the esophagus in line with the pharynx during swallowing. B) muscle that moves the trachea out of line with the pharynx during swallowing. C) flap of cartilage that flips down to cover the entry to the trachea during swallowing. D) sphincter that closes off the entry to the trachea during swallowing.