Question 1

DNA replication is called semiconservative because

Accepted Answer

A)   one of the resulting DNA molecules is comprised of entirely old DNA and one is comprised of entirely new DNA.
B)   each resulting DNA molecules is comprised of one new DNA strand and one old strand.
C)   both of the resulting DNA molecules are comprised of entirely new strands of nucleotides.
D)   no extra nucleotides are incorporated into the replicated DNA molecules.
E)   the sequence of nucleotides in one strand is conserved, whereas the new DNA molecule consists of a unique sequence of nucleotides.F) None of the above
G) A) and C)

Question 2

For a DNA strand that is two nucleotides long, how many different sequences are possible?

Accepted Answer

A)   2
B)   4
C)   8
D)   16
E)   64F) All of the above
G) A) and C)

Question 3

The sequence of the mRNA that would result from transcribing a DNA template strand with the bases TACGCTAAT would be

Accepted Answer

A)   AUGCGAUUA.
B)   AUUAGCGUA.
C)   UACGCUAAU.
D)   UAAUCGCAU.
E)   ATGCGATTA.F) A) and C)
G) C) and D)

Question 4

Prokaryote regulate gene expression at which of the following levels?

Accepted Answer

A)   epigenetic inheritance only
B)   mRNA translation, mRNA translation and epigenetic inheritance
C)   alternative mRNA processing and chromatin compaction
D)   mRNA translation and epigenetic inheritance
E)   mRNA transcriptionF) All of the above
G) A) and B)

Question 5

Female mammals form Barr bodies because

Accepted Answer

A)   compacting the chromatin of one of their X chromosomes allows them to inactivate it and produce the same amount of gene product as a male.
B)   unpacking one of their X chromosomes allows them to produce more gene product than a male.
C)   compacting the chromatin in one of their X chromosomes allows them to conserve histone proteins.
D)   compacting the chromatin in one of their X chromosomes allows them to produce more gene product than a male from the other X chromosome.
E)   unpacking one of their X chromosomes allows them to choose which allele they wish to express, which a male cannot do.F) A) and E)
G) A) and D)

Question 6

The three steps that are required for DNA replication are

Accepted Answer

A)   unwinding, complementary base pairing, and joining.
B)   base doubling, unwinding, and joining.
C)   complementary base pairing, transcription, and translation.
D)   unwinding, transcription, and translation.
E)   unwinding, base doubling, and base pairing.F) B) and C)
G) A) and E)

Question 7

The unpacking of heterochromatin into euchromatin does not immediately result in DNA transcription because

Accepted Answer

A)   Barr bodies are still present.
B)   histones still block the binding of RNA polymerase to the promoter.
C)   euchromatin is always transcriptionally inactive.
D)   transcription factors still block the binding of RNA polymerase to the promoter.
E)   heterochromatin contains DNA with accessible promoters.F) A) and B)
G) C) and E)

Question 8

Histone displacement is necessary for transcription to occur in euchromatin.

Accepted Answer

A) True 
 B)False

Question 9

Transcription activators are different from transcription factors in that

Accepted Answer

A)   transcription activators are required for RNA polymerase binding, while transcription factors slow RNA polymerase binding.
B)   transcription factors assist RNA polymerase binding while transcription activators accelerate the mRNA processing.
C)   transcription activators slow transcription, while transcription factors accelerate transcription.
D)   transcription factors prevent RNA polymerase binding, while transcription activators assist RNA polymerase binding.
E)   transcription factors are required for RNA polymerase binding, while transcription activators accelerate transcription.F) A) and B)
G) A) and E)

Question 10

What would be the most likely result on the regulation of the lac operon from a nonfunctional repressor protein?

Accepted Answer

A)   transcription of the lactose metabolizing genes, even when lactose is absent
B)   no transcription of the lactose metabolizing genes, even when lactose is present
C)   binding of the repressor protein to the operator, even when lactose is present
D)   binding of the repressor protein to the regulatory gene in both the presence and absence of lactose
E)   no transcription of the regulatory gene, even in the presence of lactoseF) C) and E)
G) A) and D)

Question 11

Using three bases to represent each amino acid in a polypeptide

Accepted Answer

A)   ensures that all amino acids are represented at least once by the code.
B)   ensures that other organisms can read the code too.
C)   ensures that DNA can replicate properly.
D)   prevents the wrong amino acid from being incorporated into a protein.
E)   prevents early termination of transcription.F) None of the above
G) A) and B)

Question 12

The term semiconservative refers specifically to

Accepted Answer

A)   DNA replication.
B)   translation.
C)   transcription.
D)   transformation.
E)   RNA processing.F) A) and E)
G) A) and D)

Question 13

Which base is found in DNA, but not in RNA?

Accepted Answer

A)   cytosine
B)   uracil
C)   thymine
D)   adenine
E)   guanineF) All of the above
G) A) and B)

Question 14

The repressor protein used by Escherichia coli to control the lac operon is coded for by a gen e located within the operon.

Accepted Answer

A) True 
 B)False

Question 15

mRNA is processed in the cytoplasm before being used in protein synthesis.

Accepted Answer

A) True 
 B)False

Question 16

Which process requires the participation of all three types of RNA?

Accepted Answer

A)   transcription
B)   translation
C)   RNA processing
D)   replication
E)   complementary base pairingF) None of the above
G) A) and D)

Question 17

The sequence of amino acids that would result from transcribing and translating a DNA template strand with the bases TACGCTAAT would be

Accepted Answer

A)   Tyr-Ala-Asn.
B)   Ile-Ser-Val.
C)   no peptide would be made; the first codon means "stop."
D)   Met-Arg-Leu.
E)   Tyr-Ser-Val.F) A) and D)
G) C) and D)

Question 18

For a DNA strand composed of the sequence AGT in the 5' to 3' direction, the free phosphate is on the ________ nucleotide and the free hydroxyl is on the ________ nucleotide.

Accepted Answer

A)   T; A
B)   A; G
C)   A; A
D)   G; T
E)   A; TF) C) and E)
G) None of the above

Question 19

Which of the following processes takes place in the cytoplasm?

Accepted Answer

A)   DNA replication
B)   transcription
C)   intron removal
D)   translation
E)   primary mRNA splicingF) A) and B)
G) None of the above

Question 20

Failure to remove introns from a primary mRNA would most likely cause

Accepted Answer

A)   irregularities in transcription.
B)   abnormal translation.
C)   DNA to mutate.
D)   DNA replication to fail.
E)   transcription to terminate early.F) C) and D)
G) All of the above

Exam 11: Dna Biology

Which of the following processes takes place in the cytoplasm?

Correct AnswerverifiedShow Answer

Prokaryote regulate gene expression at which of the following levels?

Correct AnswerverifiedShow Answer

The sequence of amino acids that would result from transcribing and translating a DNA template strand with the bases TACGCTAAT would be

Correct AnswerverifiedShow Answer

Failure to remove introns from a primary mRNA would most likely cause

Correct AnswerverifiedShow Answer

The sequence of the mRNA that would result from transcribing a DNA template strand with the bases TACGCTAAT would be

Correct AnswerverifiedShow Answer

The repressor protein used by Escherichia coli to control the lac operon is coded for by a gen e located within the operon.

Correct AnswerverifiedShow Answer

The term semiconservative refers specifically to

Correct AnswerverifiedShow Answer

Which process requires the participation of all three types of RNA?

Correct AnswerverifiedShow Answer

DNA replication is called semiconservative because

Correct AnswerverifiedShow Answer

For a DNA strand composed of the sequence AGT in the 5' to 3' direction, the free phosphate is on the ________ nucleotide and the free hydroxyl is on the ________ nucleotide.

Correct AnswerverifiedShow Answer

mRNA is processed in the cytoplasm before being used in protein synthesis.

Correct AnswerverifiedShow Answer

For a DNA strand that is two nucleotides long, how many different sequences are possible?

Correct AnswerverifiedShow Answer

Transcription activators are different from transcription factors in that

Correct AnswerverifiedShow Answer

Female mammals form Barr bodies because

Correct AnswerverifiedShow Answer

The three steps that are required for DNA replication are

Correct AnswerverifiedShow Answer

Histone displacement is necessary for transcription to occur in euchromatin.

Correct AnswerverifiedShow Answer

Which base is found in DNA, but not in RNA?

Correct AnswerverifiedShow Answer

What would be the most likely result on the regulation of the lac operon from a nonfunctional repressor protein?

Correct AnswerverifiedShow Answer

The unpacking of heterochromatin into euchromatin does not immediately result in DNA transcription because

Correct AnswerverifiedShow Answer

Using three bases to represent each amino acid in a polypeptide

Correct AnswerverifiedShow Answer

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For a DNA strand composed of the sequence AGT in the 5' to 3' direction, the free phosphate is on the nucleotide and the free hydroxyl is on the nucleotide.

Correct Answer
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