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End of Chapter Quiz
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1
Which of the following is not a type of RNA?
A)nRNA (nuclear RNA)
B)mRNA (messenger RNA)
C)rRNA (ribosomal RNA)
D)tRNA (transfer RNA)
2
Each amino acid in a protein is specified by
A)a gene.
B)a promoter.
C)an RNA molecule.
D)a codon.
3
The three-nucleotide codon system can be arranged into _______ combinations.
A)16
B)20
C)64
D)128
4
The process of obtaining a copy of the information in a gene as a strand of messenger RNA is called
A)polymerase.
B)expression.
C)transcription.
D)translation.
5
The site where RNA polymerase attaches to the DNA molecule to start the formation of an RNA molecule is called a(n)
A)promoter.
B)exon.
C)intron.
D)enhancer.
6
The process of taking the information on a strand of messenger RNA and building an amino acid chain that will become all or part of a protein molecule is called
A)polymerase.
B)expression.
C)transcription.
D)translation.
7
If an mRNA codon reads UAC, its complementary anticodon will be
A)TUC.
B)ATG.
C)AUG.
D)CAG.
8
When an mRNA leaves the cell's nucleus, it next becomes associated with
A)proteins.
B)a ribosome.
C)tRNA.
D)RNA polymerase.
9
Regarding the activity level of genes,
A)all genes are on all the time in all cells, making the needed amino acid sequences.
B)some genes are always off unless a promoter turns them on.
C)some genes are always on unless a promoter turns them off.
D)some genes are always off unless a repressor is not bound.
10
Which of the following statements is correct about prokaryotic gene expression?
A)Prokaryotic mRNAs must have introns spliced out.
B)Prokaryotic mRNAs contain the transcript of only one gene.
C)Repressors block transcription by binding to the DNA.
D)All of these statements are correct.





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