AnswersFirst Semester BiologyDNA and RNA Structure

DNA and RNA Structure Answers

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1
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Which represents a strand of RNA bases?

A
TGGCTCGAA
B
UGGCUCGAA
C
GTTAGTGCC
D
CAATCTAGG
2
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Which base is found only in RNA?

A
ribose
B
thymine
C
uracil
D
deoxyribose
3

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.
4

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
5

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
6

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

Question illustration
A
phosphate
B
uracil
C
deoxyribose
D
ribose
7

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

A
nucleotides
B
phosphate groups
C
ribosomes
D
proteins
8

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.
9

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

A
ribose
B
deoxyribose
C
phosphate group
D
nitrogenous base
10

What is the role of RNA?

A
to provide the original blueprint for protein production
B
to move information from the ribosomes to the nucleus for protein synthesis
C
to break down proteins into amino acid monomers
D
to move information from the nucleus to the ribosomes for protein synthesis
11

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
12

What is the role of RNA?

A
to provide the original blueprint for protein production
B
to move information from the ribosomes to the nucleus for protein synthesis
C
to break down proteins into amino acid monomers
D
to move information from the nucleus to the ribosomes for protein synthesis
13

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

A
nucleotides
B
phosphate groups
C
ribosomes
D
proteins
14

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

A
ribose
B
deoxyribose
C
phosphate group
D
nitrogenous base
15

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.
16

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
17

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
18

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
19

Which represents a strand of RNA bases?

A
TGGCTCGAA
B
UGGCUCGAA
C
GTTAGTGCC
D
CAATCTAGG
20

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.

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