AnswersPMHS Biology I Q2Asexual and Sexual Reproduction

DNA and RNA Structure Answers

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The diagram shows a nucleic acid in the shape of a helix.Which sugar is present in the nucleic acid that is represented in the diagram?

Question illustration
A
uracil
B
thymine
C
deoxyribose
D
ribose
2
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Which base is found only in RNA?

A
ribose
B
thymine
C
uracil
D
deoxyribose
3

DNA is a nucleic acid polymer composed of which repeating structural unit?

A
nucleotides
B
phosphate groups
C
ribosomes
D
proteins
4

A single strand of DNA helix has the code ATAGGC. Which would be the complementary code on the other strand of the helix?

A
AUACCG
B
CGCTTA
C
GCGAAT
D
TATCCG
5

Proteins are made in ribosomes, but DNA is stored in the nucleus. How does RNA help in this process?

A
RNA copies DNA and transports it to ribosomes for protein synthesis.
B
RNA changes the DNA sequence to create new proteins.
C
RNA breaks down DNA so that proteins can be formed.
D
RNA helps in the replication of DNA before protein synthesis.
6

Which discovery is attributed to Phoebus Levene?

A
extraction and observation of DNA
B
identification of ribose and deoxyribose
C
recognition of RNA as DNA’s messenger
D
construction of an accurate DNA model
7

Which of the following could be a nucleotide of RNA?

A
deoxyribose + phosphate group + thymine
B
deoxyribose + phosphate group + uracil
C
ribose + phosphate group + thymine
D
ribose + phosphate group + uracil
8

Why can uracil be used as a “clue” to identify RNA in a strand?

A
Because uracil is found in both DNA and RNA.
B
Because uracil indicates a damaged DNA strand.
C
Because uracil is always paired with thymine.
D
Because uracil is unique to RNA.
9

What did Chargaff discover while studying bases in the DNA of organisms?

A
The bases in the DNA of each organism were unique.
B
The ratios of thymine and adenine were similar, as were the ratios of guanine and cytosine.
C
The overall percentages of bases were different from one organism to the next.
D
There were equal amounts of all four bases in every organism, or 25 percent of each base.
10

On an RNA molecule, which would base pair with adenine?

A
thymine
B
guanine
C
cytosine
D
uracil
11

Which structural characteristic is seen in RNA but not in DNA?

A
double strands
B
a single strand
C
chains of nucleotides
D
a helical shape
12

Which structural component is found in DNA but not in RNA?

A
ribose
B
deoxyribose
C
phosphate group
D
nitrogenous base

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