AnswersFirst Semester BiologyDNA and RNA Structure

DNA and RNA Structure Answers

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1
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DNA is a nucleic acid polymer composed of which repeating structural unit?

A
nucleotides
B
phosphate groups
C
ribosomes
D
proteins
2
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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
3

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
4

Which base is found only in RNA?

A
ribose
B
thymine
C
uracil
D
deoxyribose
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

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

A
thymine
B
guanine
C
cytosine
D
uracil
7

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
8

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
9

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
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

Where is the DNA located in a eukaryotic cell?

A
ribosomes
B
nucleus
C
cytoplasm
D
cell membrane
12

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

A
ribose
B
deoxyribose
C
phosphate group
D
nitrogenous base
13

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
14

Which represents a strand of RNA bases?

A
TGGCTCGAA
B
UGGCUCGAA
C
GTTAGTGCC
D
CAATCTAGG

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