DNA content can be determined using a method of flow cytometry that can determine 2n or 4n states of cells based on cell counting and fluorescent labeling of DNA. Which of the following phases would be identified through flow cytometry as 2n?
a. M phase
b. G1 phase
c. G2 phase
b. S phase
Ans: b. G1 phase
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Which of the following events occurs over the
longest period of time in humans? a. blastula formation b. cleavage c. fertilization d. gastrulation e. growth and tissue specialization
Which particle is able to freely cross the plasma membrane?
a. Na+ b. Clc. oxygen d. glucose e. amino acids
The phenomenon in which RNA molecules in a cell are destroyed if they have a sequence complementary to an introduced double-stranded RNA is called _____
A) RNA interference B) RNA obstruction C) RNA blocking D) RNA disposal
The observation that different geographical areas sometimes exhibit plant and animal communities of similar appearance, even though the individual plants and animals are not closely related, is called
A. homology. B. adaptation. C. the fossil record. D. convergent evolution. E. divergent evolution.