Question 1

Which of the following mutations would cause early termination of translation of the gene pictured?

Accepted Answer

A)   Change the 4th nucleotide of the top strand from C to T, and change the 4th nucleotide of the bottom strand from G to A
B)   Change the 5th nucleotide of the top strand from G to C, and change the 4th nucleotide of the bottom strand from C to G
C)   Change the 4th nucleotide of the top strand from C to A, and change the 4th nucleotide of the bottom strand from G to T
D)   Change the 6th nucleotide of the top strand from A to T, and change the 4th nucleotide of the bottom strand from T to A
E)   Change the last nucleotide of the top strand from A to G, and change the 4th nucleotide of the bottom strand from T to CF) A) and C)
G) A) and E)

Question 2

An intervening sequence of DNA that is not expressed is called a(n)

Accepted Answer

A)   intron.
B)   exon.
C)   gene.
D)   replicon.
E)   promoter.F) A) and C)
G) A) and B)

Question 3

If an organism's DNA contains 20% adenine nucleotides,what percentage of its DNA is composed of guanine nucleotides?

Accepted Answer

A)   10%
B)   15%
C)   20%
D)   30%
E)   40%F) None of the above
G) D) and E)

Question 4

The information contained within a gene is not directly copied into which of the following chemical forms?

Accepted Answer

A)   tRNA, rRNA
B)   mRNA, tRNA
C)   rRNA, protein
D)   mRNA, protein
E)   tRNA, proteinF) B) and D)
G) A) and C)

Question 5

Proteins are active immediately after translation occurs.

Accepted Answer

A) True 
 B)False

Question 6

If an organism's DNA contains 20% adenine nucleotides,what percentage of its DNA is composed of thymine nucleotides?

Accepted Answer

A)   10%
B)   15%
C)   20%
D)   30%
E)   40%F) A) and D)
G) A) and C)

Question 7

Heterochromatin differs from euchromatin in that heterochromatin

Accepted Answer

A)   is transcriptionally active, whereas euchromatin is not.
B)   is not found in Barr bodies.
C)   is transcriptionally inactive.
D)   is the result of the unpacking of euchromatin.
E)   contains DNA with accessible promoters.F) B) and D)
G) D) and E)

Question 8

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) A) and D)
G) C) and E)

Question 9

Which of the following series of events is in the correct order?

Accepted Answer

A)   chemical binds to receptor, signal transduction pathway stimulates transcription activator, target gene is transcribed and translated
B)   signal transduction pathway stimulates receptor, transcription activator is activated by target gene
C)   chemical binds to receptor, target gene is transcribed and translated, signal transduction pathway stimulates proteins that bring about desired changes
D)   signal transduction pathway activates receptor, chemical binds to receptor, target gene stimulates transcription activator
E)   chemical binds to receptor, signal transduction pathway stimulates target gene, target gene stimulates transcription activatorF) A) and B)
G) A) and C)

Question 10

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) C) and E)
G) A) and B)

Question 11

A point mutation in the operator of the lac operon would most likely cause

Accepted Answer

A)   no 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)   no binding of the repressor protein to the operator even when lactose is absent.
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 lactose.F) A) and B)
G) All of the above

Question 12

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) B) and D)
G) A) and B)

Question 13

Which of the following is an incorrect match?

Accepted Answer

A)   transcription - removal of introns
B)   translation - polypeptide formation
C)   transcription - tRNA formation
D)   translation - mRNA binding to rRNA
E)   replication - copying of DNAF) B) and E)
G) B) and C)

Question 14

RNA differs from DNA because RNA

Accepted Answer

A)   is double-stranded, whereas DNA is not.
B)   may double back and base pair with itself, whereas DNA does not.
C)   is never single-stranded, whereas DNA may or may not be.
D)   can self-replicate, whereas DNA replication requires enzymes.
E)   is replicated along with DNA, but does not require strand separation like DNA does.F) B) and C)
G) B) and E)

Question 15

What is the hereditary material found in all cells?

Accepted Answer

A)   DNA
B)   rRNA
C)   mRNA
D)   tRNA
E)   ATPF) A) and C)
G) C) and E)

Question 16

Which section of the DNA is inactive?

Accepted Answer

A)   heterochromatin
B)   intron
C)   exon
D)   euchromatin
E)   nucleosomeF) C) and D)
G) A) and C)

Question 17

This figure represents

Accepted Answer

A)   replication.
B)   translation.
C)   transcription.
D)   transformation.
E)   base pairing.F) B) and C)
G) A) and E)

Question 18

Which of the following processes does not occur within the nucleus?

Accepted Answer

A)   DNA replication
B)   transcription
C)   intron removal
D)   translation
E)   primary mRNA splicingF) A) and C)
G) A) and B)

Question 19

Prokaryotes cannot regulate gene expression at which of the following levels?

Accepted Answer

A)   mRNA transcription and mRNA translation
B)   mRNA translation
C)   alternative mRNA processing and chromatin compaction
D)   mRNA translation and longevity of mRNA
E)   mRNA transcription and longevity of mRNAF) A) and C)
G) B) and E)

Question 20

Which of the DNA sequences shown in the figure are transcribed and translated to produce proteins?

Accepted Answer

A)   1, 2, 3, and 4
B)   2 and 3
C)   2, 3, and 4
D)   1, 2, and 3
E)   1 and 4F) All of the above
G) B) and D)

Exam 11: DNA Biology

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

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Which of the following processes does not occur within the nucleus?

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The information contained within a gene is not directly copied into which of the following chemical forms?

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Proteins are active immediately after translation occurs.

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A point mutation in the operator of the lac operon would most likely cause

Correct AnswerverifiedShow Answer

Which of the following series of events is in the correct order?

Correct AnswerverifiedShow Answer

If an organism's DNA contains 20% adenine nucleotides,what percentage of its DNA is composed of guanine nucleotides?

Correct AnswerverifiedShow Answer

RNA differs from DNA because RNA

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What is the hereditary material found in all cells?

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Using three bases to represent each amino acid in a polypeptide

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

Correct AnswerverifiedShow Answer

Which of the DNA sequences shown in the figure are transcribed and translated to produce proteins?

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Which of the following is an incorrect match?

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Which section of the DNA is inactive?

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This figure represents

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An intervening sequence of DNA that is not expressed is called a(n)

Correct AnswerverifiedShow Answer

Heterochromatin differs from euchromatin in that heterochromatin

Correct AnswerverifiedShow Answer

Prokaryotes cannot regulate gene expression at which of the following levels?

Correct AnswerverifiedShow Answer

Which of the following mutations would cause early termination of translation of the gene pictured?

Correct AnswerverifiedShow Answer

If an organism's DNA contains 20% adenine nucleotides,what percentage of its DNA is composed of thymine nucleotides?

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