6

Which of the following lists represents the chemical components of a nucleotide?

a nitrogenous base, a phosphate group, and a pentose sugar

Which of the following make up the backbone of a polynucleotide strand?

sugar and phosphate

How many polynucleotides are found in one molecule of DNA?

two

Which of the following pairs of base sequences could form a short stretch of a normal double helix of DNA?

5´-ATGC-3´ with 5´-GCAT-3´

If a DNA double helix is 100 nucleotide pairs long and contains 25 adenine bases, how many guanine bases does it contain?

75

Which molecule is a nucleotide?

ATP

If a strand of DNA has the nitrogen base sequence 5'-ATTTGC-3', what will be the sequence of the matching strand?

Adenine pairs with thymine and guanine pairs with cytosine.

Although the base pairing between two strands of DNA in a DNA molecule can be thousands to millions of base pairs long, base pairing in an RNA molecule is limited to short stretches of nucleotides in the same molecule or between two RNA molecules.

True

Based on complementary base pairing, you would expect the percentage of __________ to be equal to the percentage of __________.

adenine ... thymine

Which of the following is the largest unit of DNA organization?

genome

A sugar, a phosphate, and a base are the components of a __________.

nucleotide

A nucleotide is composed of a(n) _____.

phosphate group, a nitrogen-containing base, and a five-carbon sugar