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)
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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.
The only invertebrates capable of flight are arachnids
Indicate whether the statement is true or false
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.
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.