Which of the following statements concerning the cell cycle is FALSE?
a. The activity of Cdks increases and decreases during the cell cycle.
b. Cyclins fluctuate during the cell cycle.
c. Cdks are active only when they bind to cyclins.
d. The anaphase-promoting complex stimulates the separation of sister chromatids
e. M-Cdk inhibits mitosis
E
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A heteroduplex is a DNA double helix that contains mismatches
Indicate whether the statement is true or false
Accommodation involves the ability to
a. change the sensitivity of the rods and cones by means of neurotransmitters. b. change the curvature of the cornea. c. change the width of the lens by contracting or relaxing certain muscles. d. adapt to large changes in light intensity. e. see variations in color.
Ribosomes are organelles that are involved in ____
a. plasma membrane selectivity b. cellular energy production c. protein synthesis d. transport of materials e. DNA replication
What might be the predominant lifestyle on Earth?
A. parasitism B. mutualism C. predation D. commensalism E. herbivory