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
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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
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
New oceanic crust is formed at
a. subduction zones. d. glacial striations b. transform faults. e. mid-ocean ridges. c. meandering rivers
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