Question 1

Imagine that the short DNA base sequence GGCTGC is transcribed and then translated by a ribosome. The following activated tRNA molecules are available in the cytoplasm:  What resulting dipeptide will form?

Accepted Answer

A)   Glycine-cysteine
B)   Proline-threonine
C)   Cysteine-alanine
D)   Threonine-glycine
E)   Alanine-alanineF) A) and D)
G) A) and E)

Question 2

The sequence of nitrogen-containing bases on one strand of DNA could determine all of the following EXCEPT the sequence of

Accepted Answer

A)   nitrogen-containing bases in mRNA.
B)   nitrogen-containing bases in the other DNA strand.
C)   ribose and phosphate molecules in tRNA.
D)   amino acids in a protein molecule.E) A) and C)
F) B) and D)

Question 3

Which of the following contains four types of nucleotides but no uracil?

Accepted Answer

A)   Ribosomal RNA
B)   DNA
C)   Messenger RNA
D)   Transfer RNA
E)   RNA polymeraseF) All of the above
G) B) and C)

Question 4

How can RNA be distinguished from DNA?

Accepted Answer

A)   RNA does not contain a sugar.
B)   RNA is single-stranded.
C)   RNA is never found in the nucleus.
D)   RNA lacks the base uracil.E) C) and D)
F) B) and D)

Question 5

A mutation that results in a change in the codon-reading pattern could result from

Accepted Answer

A)   a base substitution only.
B)   either an insertion or a deletion of a base.
C)   a base insertion only.
D)   a base deletion only.E) A) and B)
F) All of the above

Question 6

Which of the following has anticodons?

Accepted Answer

A)   DNA
B)   Messenger RNA
C)   RNA polymerase
D)   Transfer RNA
E)   Ribosomal RNAF) A) and E)
G) A) and D)

Question 7

Which of the following molecules function to transfer genetic information from one generation to the next?

Accepted Answer

A)   mRNA
B)   Protein molecules
C)   DNA
D)   Lipid molecules
E)   tRNAF) None of the above
G) B) and D)

Question 8

Suppose one strand of a ʺmini-geneʺ has the base sequence TACCCGGATTCA. The last codon in the mRNA sequence will be

Accepted Answer

A)   AGU.
B)   TCA.
C)   AGT.
D)   UGA.E) A) and D)
F) B) and C)

Question 9

The nitrogenous base uracil pairs with

Accepted Answer

A)   cytosine.
B)   thymine.
C)   adenine.
D)   uracil.
E)   guanine.F) None of the above
G) B) and E)

Question 10

In the intestinal bacteria Escherichia coli, the DNA segment that contains the coding for the enzymes of lactose metabolism is called the lactose _________.

Accepted Answer

The answer of In the intestinal bacteria Escherichia coli, the...

Question 11

Determine the sequence of bases in mRNA if the original DNA base sequence is TAGGCTAA.

Accepted Answer

The answer of Determine the sequence of bases in mRNA...

Question 12

What is the site of protein synthesis in the cell?

Accepted Answer

A)   Smooth endoplasmic reticulum
B)   Nucleus
C)   Ribosome
D)   Nucleolus
E)   Eukaryotic chromosomeF) A) and E)
G) A) and B)

Question 13

The type of RNA that binds to a specific amino acid is

Accepted Answer

A)   nuclear RNA.
B)   messenger RNA.
C)   transfer RNA.
D)   ribosomal RNA.E) None of the above
F) A) and B)

Question 14

A gene mutation is defined as change in the

Accepted Answer

A)   structure of ribosomes.
B)   nucleotide sequence of DNA.
C)   activation of a gene.
D)   nucleotide sequence of RNA.E) None of the above
F) A) and B)

Question 15

Which of the following contains codons?

Accepted Answer

A)   Messenger RNA
B)   Transfer RNA
C)   DNA
D)   Ribosomal RNA
E)   RNA polymeraseF) C) and E)
G) None of the above

Question 16

Suppose the template DNA strand of a ʺmini-geneʺ has the base sequence TACCCGGATTCA. The anticodon of the tRNA that carries the first amino acid to the ribosome will be

Accepted Answer

A)   AGU.
B)   UAG.
C)   UCA.
D)   AUG.
E)   UAC.F) B) and E)
G) B) and D)

Question 17

How can a single gene code for more than one protein?

Accepted Answer

A)   Different types of ribosomes translate the resulting mRNA, producing different proteins.
B)   The exons within an mRNA can be spliced together in different ways.
C)   Different RNA polymerases transcribe it and produce different proteins.
D)   Different amino acid chains can be coded by the same mRNA.E) A) and B)
F) None of the above

Question 18

What kind of mutation occurs when one base is changed to another at a single location in the DNA?

Accepted Answer

A)   Deletion
B)   Substitution
C)   Neutral
D)   InsertionE) A) and B)
F) A) and C)

Question 19

A gene can be mutated with no resulting functional change in the protein that is produced from that gene if

Accepted Answer

A)   an entire codon has been removed.
B)   RNA polymerase can edit the mutation from the mRNA produced during translation.
C)   a codon has changed, but it codes for the same amino acid as the original codon.
D)   the mutation alters the active site of an enzyme.E) C) and D)
F) A) and C)

Question 20

The process of converting the ʺmessageʺ of mRNA into a sequence of amino acids is called

Accepted Answer

A)   translation.
B)   transcription.
C)   replication.
D)   repression.
E)   activation.F) C) and D)
G) B) and E)

Exam 13: Gene Expression and Regulation

A gene mutation is defined as change in the

Correct AnswerverifiedShow Answer

In the intestinal bacteria Escherichia coli, the DNA segment that contains the coding for the enzymes of lactose metabolism is called the lactose _________.

Correct AnswerverifiedShow Answer

What kind of mutation occurs when one base is changed to another at a single location in the DNA?

Correct AnswerverifiedShow Answer

Which of the following contains four types of nucleotides but no uracil?

Correct AnswerverifiedShow Answer

Suppose the template DNA strand of a ʺmini-geneʺ has the base sequence TACCCGGATTCA. The anticodon of the tRNA that carries the first amino acid to the ribosome will be

Correct AnswerverifiedShow Answer

Determine the sequence of bases in mRNA if the original DNA base sequence is TAGGCTAA.

Correct AnswerverifiedShow Answer

Imagine that the short DNA base sequence GGCTGC is transcribed and then translated by a ribosome. The following activated tRNA molecules are available in the cytoplasm: What resulting dipeptide will form?

Correct AnswerverifiedShow Answer

Which of the following has anticodons?

Correct AnswerverifiedShow Answer

Which of the following contains codons?

Correct AnswerverifiedShow Answer

A gene can be mutated with no resulting functional change in the protein that is produced from that gene if

Correct AnswerverifiedShow Answer

How can a single gene code for more than one protein?

Correct AnswerverifiedShow Answer

A mutation that results in a change in the codon-reading pattern could result from

Correct AnswerverifiedShow Answer

Which of the following molecules function to transfer genetic information from one generation to the next?

Correct AnswerverifiedShow Answer

The process of converting the ʺmessageʺ of mRNA into a sequence of amino acids is called

Correct AnswerverifiedShow Answer

The sequence of nitrogen-containing bases on one strand of DNA could determine all of the following EXCEPT the sequence of

Correct AnswerverifiedShow Answer

How can RNA be distinguished from DNA?

Correct AnswerverifiedShow Answer

What is the site of protein synthesis in the cell?

Correct AnswerverifiedShow Answer

The type of RNA that binds to a specific amino acid is

Correct AnswerverifiedShow Answer

Suppose one strand of a ʺmini-geneʺ has the base sequence TACCCGGATTCA. The last codon in the mRNA sequence will be

Correct AnswerverifiedShow Answer

The nitrogenous base uracil pairs with

Correct AnswerverifiedShow Answer

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