Question 1

Which of the following statements concerning genes and chromosomes is correct?

Accepted Answer

A)  A gene is a segment of a DNA molecule that contains instructions for the synthesis of one or more proteins. 
B)  A chromosome contains several DNA molecules bound to protein. 
C)  Genes directly interact with amino acids during protein synthesis. 
D)  More than one correct response. 
E)  No correct response. 
A)  A gene is a segment of a DNA molecule that contains instructions for the synthesis of one or more proteins. 
B)  A chromosome contains several DNA molecules bound to protein. 
C)  Genes directly interact with amino acids during protein synthesis. 
D)  More than one correct response. 
E)  No correct response.

Question 2

Use the following to answer the questions below:
For each of the nucleic acid situations, select the process with which it is associated using the response list. Responses may be used more than once or need not be used at all.

-hnRNA is edited to form mRNA.

Accepted Answer

A) translation phase of protein synthesis 
B) transcription phase of protein synthesis 
C) replication of DNA 
D) post-transcription phase of protein synthesis 
A) translation phase of protein synthesis 
B) transcription phase of protein synthesis 
C) replication of DNA 
D) post-transcription phase of protein synthesis

Question 3

Which of the following statements concerning tRNA molecules is incorrect?

Accepted Answer

A)  They are carriers of the amino acids needed for protein synthesis. 
B)  They have a "cloverleaf" shape with four hairpin loops. 
C)  They interact with mRNA at the site of protein synthesis. 
D)  An anticodon is present within their structure. 
A)  They are carriers of the amino acids needed for protein synthesis. 
B)  They have a "cloverleaf" shape with four hairpin loops. 
C)  They interact with mRNA at the site of protein synthesis. 
D)  An anticodon is present within their structure.

Question 4

Use the following to answer the questions below:
In each of the following multiple-choice questions, characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices:
-Statements: (1) The variable portion of a nucleic acid molecule is the sequence of bases attached to the nucleic acid "backbone."
(2) A polysome is a complex containing several mRNA molecules that simultaneously participate in protein synthesis.
(3) T, A, and G are all fused-ring nucleotide bases.

Accepted Answer

A)  All three statements are true. 
B)  Two of the three statements are true. 
C)  Only one of the statements is true. 
D)  None of the statements is true. 
A)  All three statements are true. 
B)  Two of the three statements are true. 
C)  Only one of the statements is true. 
D)  None of the statements is true.

Question 5

Use the following to answer the questions below:
For each of the nucleic acid situations, select the process with which it is associated using the response list. Responses may be used more than once or need not be used at all.

-Complete unwinding of a DNA molecule occurs.

Accepted Answer

A) translation phase of protein synthesis 
B) transcription phase of protein synthesis 
C) replication of DNA 
D) post-transcription phase of protein synthesis 
A) translation phase of protein synthesis 
B) transcription phase of protein synthesis 
C) replication of DNA 
D) post-transcription phase of protein synthesis

Question 6

Replication of DNA produces two daughter DNA molecules in which:

Accepted Answer

A)  One daughter molecule contains both parent strands and one daughter molecule contains both newly synthesized strands. 
B)  Each daughter molecule contains one parent strand and one newly synthesized strand. 
C)  Each daughter molecule contains two newly synthesized strands. 
D)  each daughter molecule contains a segment of both parent strands. 
A)  One daughter molecule contains both parent strands and one daughter molecule contains both newly synthesized strands. 
B)  Each daughter molecule contains one parent strand and one newly synthesized strand. 
C)  Each daughter molecule contains two newly synthesized strands. 
D)  each daughter molecule contains a segment of both parent strands.

Question 7

RNA molecules differ from DNA molecules in that they

Accepted Answer

A)  are single stranded rather than double stranded 
B)  contain four different bases instead of three 
C)  have a greater polarity 
D)  contain 2-dexoyribose rather than 2-deoxyglucose 
A)  are single stranded rather than double stranded 
B)  contain four different bases instead of three 
C)  have a greater polarity 
D)  contain 2-dexoyribose rather than 2-deoxyglucose

Question 8

Use the following to answer the questions below:
Match the RNA-related items with the various types of RNA given in the response list. Responses may be used more than once or need not be used at all.

-Hairpin loop

Accepted Answer

A) mRNA 
B) hnRNA 
C) rRNA 
D) tRNA 
A) mRNA 
B) hnRNA 
C) rRNA 
D) tRNA

Question 9

The genetic code is a listing that gives relationships between codons and

Accepted Answer

A)  anticodons 
B)  amino acids 
C)  exons 
D)  genes 
A)  anticodons 
B)  amino acids 
C)  exons 
D)  genes

Question 10

In DNA replication the two strands of the double helix separate, and each strand

Accepted Answer

A)  serves as a template for the construction of its own complement 
B)  forms an exact duplicate of itself 
C)  serves as a site for the formation of Okazaki fragments, which are then connected together to give the new DNA molecule 
D)  more than one correct response 
E)  no correct response 
A)  serves as a template for the construction of its own complement 
B)  forms an exact duplicate of itself 
C)  serves as a site for the formation of Okazaki fragments, which are then connected together to give the new DNA molecule 
D)  more than one correct response 
E)  no correct response

Question 11

Which of the following events occurs during the translation phase of protein synthesis?

Accepted Answer

A)  mRNA interacts with a chromosome. 
B)  Codon-anticodon base pairing occurs. 
C)  rRNAs carry amino acids to the site for protein synthesis. 
D)  More than one correct response. 
E)  No correct response. 
A)  mRNA interacts with a chromosome. 
B)  Codon-anticodon base pairing occurs. 
C)  rRNAs carry amino acids to the site for protein synthesis. 
D)  More than one correct response. 
E)  No correct response.

Question 12

Use the following to answer the questions below:
For each of the nucleic acid situations, select the process with which it is associated using the response list. Responses may be used more than once or need not be used at all.

-Partial unwinding of a DNA molecule occurs.

Accepted Answer

A) translation phase of protein synthesis 
B) transcription phase of protein synthesis 
C) replication of DNA 
D) post-transcription phase of protein synthesis 
A) translation phase of protein synthesis 
B) transcription phase of protein synthesis 
C) replication of DNA 
D) post-transcription phase of protein synthesis

Question 13

The number of different kinds of nucleotides present in any RNA molecule is

Accepted Answer

A)  four 
B)  five 
C)  six 
D)  two 
A)  four 
B)  five 
C)  six 
D)  two

Question 14

Use the following to answer the questions below:
For each of the heterocyclic bases, choose a correct characterization from the response list. Responses may be used more than once or need not be used at all.

-Adenine

Accepted Answer

A) base found only in DNA 
B) base found only in RNA 
C) "single ring" base found in both DNA and RNA 
D) "double ring" base 
A) base found only in DNA 
B) base found only in RNA 
C) "single ring" base found in both DNA and RNA 
D) "double ring" base

Question 15

Use the following to answer the questions below:
In each of the following multiple-choice questions, characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices:
-Statements: (1) The acronym PCR stands for protein condensation reaction.
(2) A codon is a sequence of three nucleotides in an mRNA molecule that codes for a specific amino acid.
(3) Most of the mass of a chromosome is protein material rather than DNA.

Accepted Answer

A)  All three statements are true. 
B)  Two of the three statements are true. 
C)  Only one of the statements is true. 
D)  None of the statements is true. 
A)  All three statements are true. 
B)  Two of the three statements are true. 
C)  Only one of the statements is true. 
D)  None of the statements is true.

Question 16

Which of the following statements concerning codons is incorrect?

Accepted Answer

A)  They are found within mRNA molecules. 
B)  They are sequences of three nucleotides. 
C)  There are 64 of them. 
D)  They are short segments of a gene. 
A)  They are found within mRNA molecules. 
B)  They are sequences of three nucleotides. 
C)  There are 64 of them. 
D)  They are short segments of a gene.

Question 17

Use the following to answer the questions below:
For each of the nucleic acid situations, select the process with which it is associated using the response list. Responses may be used more than once or need not be used at all.

-A mRNA-ribosome complex is formed.

Accepted Answer

A) translation phase of protein synthesis 
B) transcription phase of protein synthesis 
C) replication of DNA 
D) post-transcription phase of protein synthesis 
A) translation phase of protein synthesis 
B) transcription phase of protein synthesis 
C) replication of DNA 
D) post-transcription phase of protein synthesis

Question 18

Which of the following is a correct base pairing sequence between a codon and anticodon?

Accepted Answer

A)    
B)    
C)    
D)    
A)    
B)    
C)    
D)

Question 19

Use the following to answer the questions below:
Match the RNA-related items with the various types of RNA given in the response list. Responses may be used more than once or need not be used at all.

-Codon

Accepted Answer

A) mRNA 
B) hnRNA 
C) rRNA 
D) tRNA 
A) mRNA 
B) hnRNA 
C) rRNA 
D) tRNA

Question 20

Use the following to answer the questions below:
In each of the following multiple-choice questions, characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices:
-Statements: (1) The type of DNA that contains exons and introns is rRNA.
(2) A "free" phosphate group is associated with the 5' end of a nucleic acid.
(3) AMP and dAMP nucleotides differ in the sugar subunit that is present.

Accepted Answer

A)  All three statements are true. 
B)  Two of the three statements are true. 
C)  Only one of the statements is true. 
D)  None of the statements is true. 
A)  All three statements are true. 
B)  Two of the three statements are true. 
C)  Only one of the statements is true. 
D)  None of the statements is true.

Exam 22: Nucleic Acids

Which of the following statements concerning genes and chromosomes is correct?

Use the following to answer the questions below: For each of the nucleic acid situations, select the process with which it is associated using the response list. Responses may be used more than once or need not be used at all. -hnRNA is edited to form mRNA.

Which of the following statements concerning tRNA molecules is incorrect?

Use the following to answer the questions below: For each of the nucleic acid situations, select the process with which it is associated using the response list. Responses may be used more than once or need not be used at all. -Complete unwinding of a DNA molecule occurs.

Replication of DNA produces two daughter DNA molecules in which:

RNA molecules differ from DNA molecules in that they

Use the following to answer the questions below: Match the RNA-related items with the various types of RNA given in the response list. Responses may be used more than once or need not be used at all. -Hairpin loop

The genetic code is a listing that gives relationships between codons and

In DNA replication the two strands of the double helix separate, and each strand

Which of the following events occurs during the translation phase of protein synthesis?

Use the following to answer the questions below: For each of the nucleic acid situations, select the process with which it is associated using the response list. Responses may be used more than once or need not be used at all. -Partial unwinding of a DNA molecule occurs.

The number of different kinds of nucleotides present in any RNA molecule is

Use the following to answer the questions below: For each of the heterocyclic bases, choose a correct characterization from the response list. Responses may be used more than once or need not be used at all. -Adenine

Which of the following statements concerning codons is incorrect?

Use the following to answer the questions below: For each of the nucleic acid situations, select the process with which it is associated using the response list. Responses may be used more than once or need not be used at all. -A mRNA-ribosome complex is formed.

Which of the following is a correct base pairing sequence between a codon and anticodon?

Use the following to answer the questions below: Match the RNA-related items with the various types of RNA given in the response list. Responses may be used more than once or need not be used at all. -Codon

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