Question 1

A unit of a chromosome that consists of DNA wound around a core of eight histone proteins is a transposon.

Accepted Answer

A) True 
 B)False

Question 2

A (an) _______ is a group of three bases on tRNA that is complementary to a specific mRNA codon.

Accepted Answer

A)  codon
B)  anticodon
C)  poly-A tail
D)  capE) C) and D)
F) All of the above

Question 3

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) B) and D)
F) A) and D)

Question 4

Codons:

Accepted Answer

A)  are triplets coding for a single amino acid.
B)  are the alphabet of the genetic language.
C)  each have only one meaning.
D)  All of the choices are correct.
E)  Only two of the choices are true.F) B) and E)
G) All of the above

Question 5

Transcription is initiated when:

Accepted Answer

A)  initiation factors assemble ribosomal subunits,mRNA,and initiator tRNA.
B)  RNA polymerase comes to a stop sequence.
C)  RNA polymerase binds to a region of DNA called the promoter.
D)  new nucleotides are added to an existing strand of nucleotides.E) All of the above
F) C) and D)

Question 6

Which statement is NOT true about DNA replication in prokaryotes?

Accepted Answer

A)  Replication begins at a single origin of replication.
B)  Replication is bidirectional from the origin(s) .
C)  Replication occurs at about 1 million base pairs per minute.
D)  Since bacterial cells replicate so rapidly,a second round of replication may begin before the first has been completed.
E)  There are many bacterial chromosomes,with replication occurring in each at the same time.F) B) and D)
G) A) and D)

Question 7

Which of the following statements is NOT true about the debate over the nature of genetic material?

Accepted Answer

A)  Many scientists believed that DNA was not the genetic material because,with only four types of nucleotides,DNA did not have enough variability to store information.
B)  Scientists focused on carbohydrate and protein in their studies of possible genetic material since they knew that genes were on chromosomes and that chromosomes were made of carbohydrate and protein.
C)  Many scientists thought that proteins had a greater capacity for storing information because proteins contain 20 amino acids that could be sequenced differently.
D)  Some scientists thought that RNA was likely to be the genetic material.E) A) and B)
F) A) and C)

Question 8

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

Question 9

Determine the number of codon sequences it would require to produce the following amino acid sequence: alanine - proline - serine - isoleucine - stop.

Accepted Answer

A)  It would take 5 codon sequences.
B)  It would take 3 codon sequences.
C)  It would take 6 codon sequences.
D)  It would take 4 codon sequences.E) B) and C)
F) None of the above

Question 10

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

Question 11

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) C) and D)
F) A) and C)

Question 12

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) B) and D)
F) C) and D)

Question 13

Scientists have created genetically modified organisms (GMOs) by isolating and then transferring the jellyfish gene for green fluorescent protein into pigs,bacteria,plants and mice.The result was bioluminescent organisms! These experiments demonstrate that:

Accepted Answer

A)  jellyfish genes may be transferred into other aquatic ectotherms,but not mammals
B)  genes have no difficulty crossing the species barrier
C)  animal genes will not function if transferred into animals
D)  genes can only be transferred to other organisms within the same speciesE) A) and B)
F) All of the above

Question 14

The poly-A tail is a modified guanine nucleotide that tells a ribosome where to attach when translation begins.

Accepted Answer

A) True 
 B)False

Question 15

Telomerase is an enzyme that unwinds DNA during DNA replication.

Accepted Answer

A) True 
 B)False

Question 16

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) All of the above
G) A) and E)

Question 17

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) C) and D)
G) B) and E)

Question 18

In the Watson and Crick model of DNA,the "steps" of the ladder are composed of

Accepted Answer

A)  sugars.
B)  a purine and a pyrimidine.
C)  two purines.
D)  two pyrimidines.
E)  a sugar and a phosphate molecule.F) A) and D)
G) C) and D)

Question 19

Ribozymes are RNA molecules that function as enzymes,catalyzing reactions during RNA splicing.

Accepted Answer

A) True 
 B)False

Question 20

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 E)
G) B) and C)

Exam 12: Molecular Biology of the Gene

A (an) _______ is a group of three bases on tRNA that is complementary to a specific mRNA codon.

Correct AnswerverifiedShow Answer

Ribozymes are RNA molecules that function as enzymes,catalyzing reactions during RNA splicing.

Correct AnswerverifiedShow Answer

Which is NOT true about the genetic code?

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

Determine the number of codon sequences it would require to produce the following amino acid sequence: alanine - proline - serine - isoleucine - stop.

Correct AnswerverifiedShow Answer

In the Watson and Crick model of DNA,the "steps" of the ladder are composed of

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Codons:

Correct AnswerverifiedShow Answer

Scientists have created genetically modified organisms (GMOs) by isolating and then transferring the jellyfish gene for green fluorescent protein into pigs,bacteria,plants and mice.The result was bioluminescent organisms! These experiments demonstrate that:

Correct AnswerverifiedShow Answer

The poly-A tail is a modified guanine nucleotide that tells a ribosome where to attach when translation begins.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which statement is NOT true about DNA replication in prokaryotes?

Correct AnswerverifiedShow Answer

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

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Telomerase is an enzyme that unwinds DNA during DNA replication.

Correct AnswerverifiedShow Answer

A unit of a chromosome that consists of DNA wound around a core of eight histone proteins is a transposon.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which statement is NOT true about DNA replication in eukaryotes?

Correct AnswerverifiedShow Answer

Transcription is initiated when:

Correct AnswerverifiedShow Answer

Which of the following statements is NOT true about the debate over the nature of genetic material?

Correct AnswerverifiedShow Answer

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