AnswersSTPSB_Biology CR 2627 MitchellLab: Building Proteins from RNA

Lab: Building Proteins from RNA — Unit test Answers

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1
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Which is not something that occurs in translation?

A
A codon and an anticodon pair.
B
A peptide bond is created.
C
A molecule of mRNA is formed.
D
An amino acid is added to a polypeptide.
2
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What does DNA provide the code for?

A
nitrogenous base pairing
B
protein synthesis
C
deoxyribose formation
D
nucleotide synthesis
3

Francois Jacob and Jacques Monod studied Escherichia coli (E. coli) bacteria by using lab experimentation. What revision to their initial hypothesis did they come up with?

A
The lac operon is repressed by allolactose.
B
E. coli are unable to process lactose sugar.
C
All E. coli operons are always turned on.
D
Two operons regulate gene control in E. coli.
6

Which does not occur during translation?

A
tRNA pairs with complementary mRNA.
B
Met-tRNA binds to the start codon.
C
DNA is transcribed into a complementary strand of mRNA.
D
A chain of amino acids, linked by peptide bonds, is formed.
8

Which base is found only in DNA?

A
adenine
B
guanine
C
cytosine
D
thymine
9

Which step in transcription occurs first?

A
mRNA moves the code from the nucleus to the ribosome for protein production.
B
A gene is expressed through protein production.
C
RNA polymerase attaches to the promoter.
D
A repressor protein must attach to the operator.
10

Which of the following difference between DNA and RNA allows them to perform their unique functions?

A
DNA contains ribose, while RNA contains deoxyribose.
B
DNA is single-stranded, whereas RNA is double-stranded.
C
DNA contains thymine, while RNA contains uracil.
D
RNA is found only in the nucleus, while DNA is found only in the cytoplasm.
12

Which accurately describes the relationship between cancer risk and exposure to mutagens?

A
Cancer risk decreases when a person is exposed to mutagens because the risk of DNA mutation decreases as well.
B
Cancer risk increases when a person is exposed to mutagens because the risk of DNA mutations increases as well.
C
Cancer risk increases when a person is exposed to mutagens because the risk of DNA mutations decreases considerably.
D
Cancer risk decreases when a person is exposed to mutagens because the risk of DNA mutations increases considerably.

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