Biology Dna Questions Page 2
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29. Which diagram best represents a basic structural unit of DNA?
Key
P = Phosphate
D = Deoxyribose sugar
R = Ribose sugar
U= Uracil
A= Adenine
(1)
(2)
(3)
(4)
10. The parts of a DNA nucleotide are indicated in the chart below by letters A, B, and C, An X indicates which
chemical elements are present in each part.
Which diagram best represents a DNA nucleotide.
(1)
(3)
(4)
(2)
11. When bonded together chemically, deoxyribose, phosphate, and an adenine molecule make up
(1) a DNA nucleotide
(2) an RNA nucleotide
(3) a DNA molecule
(4) an RNA molecule
12. In addition to a phosphate group, a DNA nucleotide could contain
(1) thymine and deoxyribose
(3) thymine and ribose
(2) uracil and deoxyribose
(4) uracil and ribose
13. Which molecule is correctly paired with its building blocks?
(1) cellulose – polypeptides
(3) protein – monosaccharides
(4) fat – disaccharides
(2) DNA – nucleotides
14. The specificity of genetic material is the result of the
(1) type of sugar present in DNA
(3) order of the nitrogen bases in DNA
(2) type of phosphate found in a cell
(4) order of the amino acids in a protein
15. During the replication of a DNA molecule, separation or "unzipping" of the DNA molecule will normally occur
when hydrogen bonds are broken between
(1) thymine and thymine (2) guanine and uracil
(3) adenine and cytosine
(4) cytosine and guanine
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