Most of the carbon dioxide in the blood is transported:a
by being dissolved in plasma.
b. as bicarbonate ions.
c. by hemoglobin.
d. as carbonic anhydrase.
e. as carbonic acid.
b
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If an enzyme's optimal temperature is 37?C, you also know that
a. the enzyme has a cofactor. b. the enzyme is likely to be active at 30?C and at the same reaction rate. c. the enzyme will probably be inactive at a pH below 4.5. d. the enzyme will completely denature at 38?C. e. the enzyme's activity will drop at temperatures above 37?C and likely be eliminated by 60?C.
A somatic cell from a garden pea normally contains 14 chromosomes. How many sister chromatids would that cell contain during G1 of the cell cycle?
A. 7 B. 14 C. 0 D. 28
All etiologic agents are pathogens.
a. true b. false
For each of the following sentences, choose one of the options enclosed in square brackets to make a correct statement about nucleosomes
A. Nucleosomes are present in [prokaryotic/eukaryotic] chromosomes, but not in [prokaryotic/eukaryotic] chromosomes. B. A nucleosome contains two molecules each of histones [H1 and H2A/H2A and H2B] as well as of histones H3 and H4. C. A nucleosome core particle contains a core of histone with DNA wrapped around it approximately [twice/three times/four times]. D. Nucleosomes are aided in their formation by the high proportion of [acidic/basic/polar] amino acids in histone proteins. E. Nucleosome formation compacts the DNA into approximately [one-third/one-hundredth/one-thousandth] of its original length.