The sugar in deoxyribonucleic acid, DNA, is called 2-deoxy-D-ribose. It is found as a single stereoisomer. How many enantiomers of 2-deoxy-D-ribose exist?

A) 0
B) 1
C) 2
D) 4


B

Environmental & Atmospheric Sciences

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Which of the following correctly describes the composition of NAD+?

A) adenine, nicotinamide, a ribose and a ribitol linked by a diphosphate B) adenine, nicotinamide, and two ribose molecules linked by a diphosphate C) adenine, nicotinamide, and two ribose molecules linked by a triphosphate D) adenine, nicotinamide, and two ribitol molecules linked by a diphosphate

Environmental & Atmospheric Sciences

When the amount of dissolved minerals in ocean or lake water reach saturation they begin to _______________ and build up as a deposit on the sea or lake bottom

Fill in the blank(s) with correct word

Environmental & Atmospheric Sciences

New oceanic crust is formed at

a. subduction zones. d. glacial striations b. transform faults. e. mid-ocean ridges. c. meandering rivers

Environmental & Atmospheric Sciences

What percentage of the 25 key nonrenewable mineral resources must the US import?

A. All or nearly all B. Little to none C. 1/4 to 1/2 D. 1/2 to 3/4

Environmental & Atmospheric Sciences