A thymine dimer affects the DNA molecule by
a. breaking it apart.
b. distorting its structure.
c. preventing effective DNA repair.
d. interfering with base pairing.
e. both b and c.
E
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NADPH contains the pentose sugar ________ and the nitrogenous base ________.
A) glucose; thymine B) deoxyribose; cytosine C) deoxyribose; nicotinamide D) ribose; adenine E) ribose; nicotinamide
In his monohybrid crosses, Mendel deduced that one trait was recessive because that trait was ____
a. not present in the F1 and did not reappear in the F2 b. present in the F1 and in the F2 c. not present in the F1 and reappeared in the F2 d. present only in the parents e. present only in the F2
All of the following allow for fast gas exchange EXCEPT
a. more dense medium. b. colder temperatures. c. a steep gradient. d. a large surface area.
For a neuron, the outside of the plasma membrane has a higher concentration of ____ than the inside
of the plasma membrane.
a. Na+ b. K+ c. Ca2+ d. anions e. ATP