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CLEP Biology Practice Test
Multiple Choice
CLEP Biology
Multiple Choice Practice Test
Question 1 of 3
38% Get this Question Right
Which of the following chemical moieties forms the backbone of DNA?
A
Amino groups
B
Pentose and phosphate
C
Nitrogenous bases
D
Glycerol
E
Glucose and phosphate
DNA is composed of nucleotides joined together in long chains. Nucleotides are composed of a pentose sugar, a phosphate group, and a nitrogenous base. The bases form the "rungs" of the ladder at the core of the DNA helix and the pentose-phosphates are on its outside, or backbone.
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