Outline the major differences between mitosis and meiosis I. What will be an ideal response?
Concepts to Consider: During prophase of meiosis I, there is crossing over between homologous
chromosomes, which does not take place during mitosis. In addition, during meiosis I, tetrads
composed of homologous chromosomes line up on the metaphase plate rather than sister chromatids,
as happens in mitosis. It is the homologous chromosomes that separate during anaphase of meiosis I
rather than sister chromatids (as happens during mitosis).
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Cheetahs have been through a genetic bottleneck; evidence for this is that
A. the body is long, thin, and graceful. B. these cats are members of an endangered species. C. there is very little genetic variability. D. little natural selection occurs in this species. E. they originally came from small areas of Africa.
Zircon crystals that form in molten magma are easily dated because they initially contain ____
a. no lead b. no uranium c. uranium but no lead d. lead but no uranium e. both lead and uranium
When 10,000 molecules of ATP are hydrolyzed to ADP and i in a test tube, about half as much heat is liberated as when a cell hydrolyzes the same amount of ATP. Which of the following is the best explanation for this observation?
A) Cells are open systems, but a test tube is an isolated system. B) Cells are less efficient at heat production than nonliving systems. C) The reaction in cells must be catalyzed by enzymes, but the reaction in a test tube does not need enzymes. D) Reactant and product concentrations in the test tube are different from those in the cell.
What are enzymes called that control the activities of other proteins by phosphorylating them?
A) ATPases B) chromatin C) phosphatases D) cyclins E) kinases