In somatic cells, if a base is mismatched in one new daughter strand during DNA replication, and is not repaired, what fraction of the DNA duplexes will have a permanent change in the DNA sequence after the second round of DNA replication?

(a) 1/2
(b) 1/4
(c) 1/8
(d) 1/16


(b)

Biology & Microbiology

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________ is a technique used to measure ion currents passing through individual channels along a nerve cell

Fill in the blank with correct word.

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The only invertebrates capable of flight are arachnids

Indicate whether the statement is true or false

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An embryo with meroblastic cleavage, extra-embryonic membranes, and a primitive streak must be that of

A) an insect. B) a fish. C) an amphibian. D) a bird. E) a sea urchin.

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K+ leak channels are found in the plasma membrane. These channels open and close in an unregulated, random fashion. What do they accomplish in a resting cell?

(a) They set the K+ concentration gradient to zero. (b) They set the membrane potential to zero. (c) They disrupt the resting membrane potential. (d) They keep the electrochemical gradient for K+ at zero.

Biology & Microbiology