The mitotic spindle is made of:
a. motor proteins.
b. condensin.
c. histones.
d. Z rings.
e. microtubules
e
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Chromosomes can be condensed into compact structures, visible with the light microscope, but usually only:
A. while the nuclear pores are open. B. while the proteins are being assembled. C. after the cell is dead. D. while the DNA is being copied into RNA. E. during cell division.
Which of the following is mismatched?
a. cytokinin; promotes cell division b. abscisic acid; triggers bud and seed dormancy c. ethylene; breaks dormancy of seeds and buds d. auxin; involved in phototropism and gravitropism e. nitric oxide; involved in plant defense responses
Which of the following statements about Mendel's breeding experiments is correct?
A) None of the parental (P) plants were true-breeding. B) All of the F2 progeny showed a phenotype that was intermediate between the two parental (P) phenotypes. C) Half of the F1 progeny had the same phenotype as one of the parental (P) plants, and the other half had the same phenotype as the other parent. D) All of the F1 progeny resembled one of the parental (P) plants, but only some of the F2 progeny did. E) none of the above
One difference between mitotic cell division in animal cells and plant cells is that
A) cytokinesis occurs in animal cells but has not yet been observed in plant cells. B) animal cells do not undergo telophase. C) in animal cells, cytokinesis occurs as vesicles deposit carbohydrates along the equator. D) plant cells do not undergo anaphase. E) in plant cells, cytokinesis occurs as vesicles deposit carbohydrates along the equator.