Which of the following is a protein maintained at steady levels throughout the cell cycle that requires cyclin to become catalytically active?
A) PDGF
B) MPF
C) cyclin
D) Cdk
D
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The movement of potassium out of a resting neuron is a consequence of:
A. the electrical gradient across the membrane. B. the high concentration of potassium inside the cell. C. the presence of potassium leak channels in the membrane. D. the high concentration of potassium inside the cell AND the presence of potassium leak channels in the membrane.
A third mutant allele of gene B (allele b3) causes the frogs' eyes to become green, instead of their normal red color. Normally, gene B effects only skin color. What term describes this allele?
A) Hypermorphic B) Neomorphic C) Hypomorphic D) Amorphic E) Haploinsufficient
Will our modern forests eventually become coal? What will be an ideal response?
Which best describes a catabolic reaction?
a. It involves the expenditure of energy. b. It involves the anabolic production of complex molecules. c. It involves the breakdown of life sustaining processes within cells. d. It involves the breakdown of large organic molecules to simple building blocks. e. It involves the building up of complex organic molecules from simple building blocks.