Duplicated centrioles move to opposite poles of a(n) ____ cell during ____ of the cell cycle
a. animal; prophase
b. plant; prophase
c. animal; metaphase
d. plant; metaphase
e. both animal and plant cells; prophase
A
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In order for a cell to respond to the signaling molecule epinephrine, it must ____
a. have ion channels b. have a lipid bilayer that allows the response to occur c. have receptors exposed on the inner plasma membrane surface d. have receptors exposed on the plasma membrane surface e. have nuclear membrane receptors
Which of the following is not a pinniped:
1.seal 2.sea lion 3.walrus 4.sea otter
The fact that a nucleic acid is a very complicated molecule suggests that
A. sophisticated enzymes were not present or available to synthesize it. B. RNA could not have arisen on its own by chance, but required enzymes to guide the synthesis of nucleotides and then nucleic acids. C. no natural system could ever generate it. D. the protein-first hypothesis is therefore the only plausible hypothesis. E. the RNA-first hypothesis is impossible.
Which peak represents cells that contain the most DNA?
A) A B) B C) C D) It cannot be determined from this figure.