During the repolarization phase of an action potential, the membrane potential falls from +60 to -70 mV. This drop is due mostly to the movement of ________ ions
A) chloride B) potassium C) sodium D) calcium E) hydrogen
B
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The two strands of a DNA double helix are held to each other by ____ bonds between nitrogenous bases
a. phosphodiester b. disulfide c. glycosidic d. hydrogen e. peptide
In the United States, what fraction of fresh
water taken from the environment is used to irrigate agricultural fields? a. 0. b. 20. c. 40. d. 60. e. 80.
Looking at the information in the table above, if the A allele results in normal pigmentation and the a allele in albinism, what fraction of offspring would you expect to show albinism?
a) 1/4 b) 1/2 c) all of them d) 3/4 e) 2/4
If you cut out a gene using the restriction enzymes EcoRI and BamHI, what enzyme(s) will you need to insert the gene into another chromosome?
A) EcoRI only B) BamHI only C) Both EcoRI and BamHI D) Neither of these enzymes