AnswersLincoln Biology A-CRUnit Test

Protein Synthesis Answers

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1
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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.
2
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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
3

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
4

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

A
ribose
B
deoxyribose
C
phosphate group
D
nitrogenous base
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 represents a strand of RNA bases?

A
TGGCTCGAA
B
UGGCUCGAA
C
GTTAGTGCC
D
CAATCTAGG
7

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
8

Where is the DNA located in a eukaryotic cell?

A
ribosomes
B
nucleus
C
cytoplasm
D
cell membrane
9

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
10

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.

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