Early in mitosis, chromatin condenses. Which process takes place more easily as a result?
a. disappearance of the nuclear envelope
b. replication of DNA
c. orderly distribution of DNA into the two new nuclei
d. formation of the mitotic spindle
e. disintegration of nucleoli
ANSWER: c
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If a population of diploid organisms has three different alleles for a particular gene, how many different genotypes are possible?
A. 2 B. 3 C. 6 D. 9 E. 12
Which of the following is the most unique aspect of archaeon cell envelopes?
A. Some archaeons have lipid monolayers in their plasma membrane. B. Archaeon capsules can be composed of protein or polysaccharide. C. The cell walls contain a modified type of peptidoglycan D. The plasma membrane is composed of phospholipids
Which of the following do humans NOT have taste buds specialized to sense?
A. salty B. sour C. sweet D. vitamins E. bitter
The age that saw a great diversification of land plants, as well as the first amphibians, was the
a. Cambrian. b. Cretaceous. c. Devonian. d. Jurassic. e. Ordovician.