Question 1

An experiment was performed in which DNAase enzyme digestion prevented transformation. This finding

Accepted Answer

A)    supports Hypothesis I. 
B)    supports Hypothesis II. 
C)    supports Hypothesis III. 
D)    rejects Hypothesis I only. 
E)    rejects Hypothesis II only. F)   rejects Hypothesis III only. G)   does not support any of these hypotheses. H) A) and D)
I) F) and G)

Question 2

If one strand of DNA has the base sequence AAGCAA, the complementary strand has which of the following sequences?

Accepted Answer

A)   UUCGUU
B)   TTCGTT
C)   AAGCAA
D)   UTCGTU
E)   TTCGTGF) A) and D)
G) A) and B) B

Question 3

Which section of the pre-mRNA contains the protein coding regions?

Accepted Answer

A)   exons
B)   introns
C)   The entire pre-mRNA contains protein coding regions.
D)   The pre-mRNA does not code for proteins at all.E) All of the above
F) None of the above

Question 4

The X-ray diffraction photography of Rosalind Franklin and Maurice Wilkins was critical evidence in the study of DNA,

Accepted Answer

A)   indicating that DNA has a double helix structure.
B)   showing equal numbers of purines and pyrimidines.
C)   showing the bases of DNA were held together by hydrogen bonds.
D)   revealing the structure of the deoxyribose sugar.
E)   of the location of each adenine, guanine, cytosine, and thymine.F) B) and C)
G) C) and D)

Question 5

Which of the following amino acid chains would be produced from the mRNA sequence AUACUUCCUAGUUGA?

Accepted Answer

A)   Isoleucine - leucine- proline- serine- stop
B)   Isoleucine - leucine- stop - proline- serine
C)   Glycine - glutamate - lysine - lysine - stop
D)   Isoleucine - alanine- proline- serine- stopE) B) and C)
F) A) and D)

Question 6

The first codon to be deciphered was ______, which codes for ________.

Accepted Answer

A)   AAA, proline
B)   GGG, alanine
C)   UUU, phenylalanine
D)   TTT, arginine
E)   CCC, glycineF) C) and D)
G) A) and D) C

Question 7

If a DNA sample contains 13% adenine, what percentage of the sample contains cytosine?

Accepted Answer

A)   13%
B)   37%
C)   26%
D)   74%E) A) and B)
F) All of the above

Question 8

Nucleotides contain all of the following except

Accepted Answer

A)   a phosphate group.
B)   a 5 - carbon sugar.
C)   a nitrogen base.
D)   histones.
E)   a phosphate and a nitrogen base.F) A) and D)
G) A) and E)

Question 9

An unknown chemical is analyzed and found to contain the bases thymine and guanine. This chemical is most likely

Accepted Answer

A)   tRNA.
B)   mRNA.
C)   DNA.
D)   rRNA.E) C) and D)
F) B) and D)

Question 10

The correct sequence of events in translation is

Accepted Answer

A)   initiation, termination, elongation.
B)   elongation, termination, initiation.
C)   termination, elongation, initiation.
D)   elongation, initiation, termination.
E)   initiation, elongation, termination.F) A) and B)
G) B) and C)

Question 11

Which of the following polypeptide chain would be sequenced from the mRNA code AGGGAGCCC?

Accepted Answer

A)   arginine - glutamate - proline
B)   serine - leucine - proline
C)   arginine - glutamate - alanine
D)   serine - asparatate - prolineE) None of the above
F) A) and B) A

Question 12

Which statement is NOT true about DNA replication in eukaryotes?

Accepted Answer

A)   Replication of the entire genome takes about ten minutes.
B)   A replication fork occurs at each growing point of the replicating chromosome(s) .
C)   Eukaryotes have many different chromosomes, with replication occurring in each at the same time.
D)   Replication occurs at the rate of about 500-5000 base pairs per minute.
E)   Multiple sites of replication are present on each chromosome.F) B) and C)
G) C) and E)

Question 13

Which of the following statements concerning ribosomes are true?

Accepted Answer

A)   Several ribosomes are often attached to and translating the same mRNA.
B)   Ribosomes join amino acids to form a polypeptide.
C)   Ribosomes have a binding site for mRNA and three binding sites for tRNA molecules.
D)   No protein synthesis within a cell would occur without ribosomes.
E)   All of the above statements are true.F) A) and B)
G) All of the above

Question 14

During the replication of DNA, DNA polymerase has to synthesize the daughter strand in the 5' to 3' direction because DNA polymerase can only join nucleotides to the 3' end of the growing new strand.

Accepted Answer

A) True 
 B)False

Question 15

Which is NOT true about the genetic code?

Accepted Answer

A)   Most amino acids have only one codon.
B)   It is composed of a triplet code of three bases per codon.
C)   It produces 64 different possibilities of base sequences.
D)   It was cracked through the use of a cell-free system of enzymes.
E)   It contains start and stop codons as instructions.F) A) and D)
G) B) and C)

Question 16

Which statement is NOT true about DNA replication?

Accepted Answer

A)   It proceeds in a 5'-to-3' direction only.
B)   One strand of new DNA is replicated faster than the other strand at the replication fork.
C)   DNA can only replicate at one point on a chromosome at one time.
D)   It occurs more rapidly in bacteria than in eukaryotes.
E)   Replication can only begin at a special origin of replication.F) A) and B)
G) A) and C)

Question 17

Before the DNA repair enzyme complex has completed its function, approximately how many base-pairs are still improperly matched?

Accepted Answer

A)   1 in 10,000
B)   1 in 100,000
C)   1 in 1,000,000
D)   1 in 10,000,000
E)   1 in a billionF) None of the above
G) B) and D)

Question 18

An experiment was performed that demonstrated that the addition of protein-degrading enzyme did not prevent transformation. This finding

Accepted Answer

A)    supports Hypothesis I. 
B)    supports Hypothesis II. 
C)    supports Hypothesis III. 
D)    rejects Hypothesis I only. 
E)    rejects Hypothesis II only. F)   rejects Hypothesis III only. G)   does not support any of these hypotheses. H) C) and D)
I) E) and F)

Question 19

For translation to take place, which of the following would NOT be required to be present?

Accepted Answer

A)   DNA
B)   mRNA
C)   tRNA-amino acid complex
D)   rRNA
E)   ribosomeF) A) and C)
G) C) and D)

Question 20

Which of the following statements about DNA replication is NOT correct?

Accepted Answer

A)   Unwinding of the DNA molecule occurs as hydrogen bonds break.
B)   Replication occurs as each base is paired with another exactly like it.
C)   The process is known as semiconservative replication because one old strand is conserved in the new molecule.
D)   The enzyme that catalyzes DNA replication is DNA polymerase.
E)   Complementary base pairs are held together with hydrogen bonds.F) D) and E)
G) C) and E)

Exam 12: Molecular Biology of the Gene

An experiment was performed in which DNAase enzyme digestion prevented transformation. This finding

Correct AnswerverifiedShow Answer

If one strand of DNA has the base sequence AAGCAA, the complementary strand has which of the following sequences?

Correct AnswerverifiedB

Which section of the pre-mRNA contains the protein coding regions?

Correct AnswerverifiedShow Answer

The X-ray diffraction photography of Rosalind Franklin and Maurice Wilkins was critical evidence in the study of DNA,

Correct AnswerverifiedShow Answer

Which of the following amino acid chains would be produced from the mRNA sequence AUACUUCCUAGUUGA?

Correct AnswerverifiedShow Answer

The first codon to be deciphered was ______, which codes for ________.

Correct AnswerverifiedC

If a DNA sample contains 13% adenine, what percentage of the sample contains cytosine?

Correct AnswerverifiedShow Answer

Nucleotides contain all of the following except

Correct AnswerverifiedShow Answer

An unknown chemical is analyzed and found to contain the bases thymine and guanine. This chemical is most likely

Correct AnswerverifiedShow Answer

The correct sequence of events in translation is

Correct AnswerverifiedShow Answer

Which of the following polypeptide chain would be sequenced from the mRNA code AGGGAGCCC?

Correct AnswerverifiedA

Which statement is NOT true about DNA replication in eukaryotes?

Correct AnswerverifiedShow Answer

Which of the following statements concerning ribosomes are true?

Correct AnswerverifiedShow Answer

During the replication of DNA, DNA polymerase has to synthesize the daughter strand in the 5' to 3' direction because DNA polymerase can only join nucleotides to the 3' end of the growing new strand.

Correct AnswerverifiedShow Answer

Which is NOT true about the genetic code?

Correct AnswerverifiedShow Answer

Which statement is NOT true about DNA replication?

Correct AnswerverifiedShow Answer

Before the DNA repair enzyme complex has completed its function, approximately how many base-pairs are still improperly matched?

Correct AnswerverifiedShow Answer

An experiment was performed that demonstrated that the addition of protein-degrading enzyme did not prevent transformation. This finding

Correct AnswerverifiedShow Answer

For translation to take place, which of the following would NOT be required to be present?

Correct AnswerverifiedShow Answer

Which of the following statements about DNA replication is NOT correct?

Correct AnswerverifiedShow Answer

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B

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The first codon to be deciphered was , which codes for __.

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C

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A

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