Question 1

The enzyme peptidyl transferase catalyzes peptide bond formation during the elongation stage of translation.
__________________

Accepted Answer

A) True 
 B)False

Question 2

A transposon is a DNA sequence that "jumps" into the middle of a gene.
__________________

Accepted Answer

A) True 
 B)False

Question 3

Figure 13-1
Use the figure to answer the corresponding question(s) . 
-RNA differs from DNA in all of the following except:

Accepted Answer

A)   RNA is usually single-standed.
B)   RNA lacks thymine.
C)   RNA contains uracil.
D)   RNA contains ribose.
E)   RNA contains cytosine.

Question 4

A mutation that replaces one amino acid in a protein with another is called a __________ mutation.

Accepted Answer

A)   frameshift
B)   recombinant
C)   nonsense
D)   missense
E)   neutral

Question 5

The 3' end of eukaryotic pre-mRNAs are changed by:

Accepted Answer

A)   removing the last phosphate group.
B)   adding a "cap."
C)   copying the last few bases so that it can form a duplex structure.
D)   adding 100-250 adenine nucleotides.
E)   phosphorylation of the mRNA molecule.

Question 6

Which of the following is made from DNA?

Accepted Answer

A)   tRNA only
B)   mRNA only
C)   rRNA only
D)   mRNA and tRNA only
E)   mRNA, tRNA, and rRNA

Question 7

Frameshift mutations result from:

Accepted Answer

A)   the substitution of one base pair for another.
B)   the substitution of more than one base pair.
C)   the insertion or deletion of one or two base pairs.
D)   the substitution of a stop codon for an amino acid-specifying codon.
E)   the substitution of a start codon for an amino acid codon.

Question 8

How does the first nucleotide at the 5' end of a new mRNA chain differ from the other nucleotides in the chain?

Accepted Answer

A)   The first nucleotide is always a uracil.
B)   The first nucleotide is always a cytosine.
C)   The first nucleotide retains its triphosphate group, while the others do not.
D)   The first nucleotide does not retain its triphosphate group, while the others in the chain do.
E)   The first nucleotide is always a modified cytosine.

Question 9

The enzyme peptidyl transferase, which catalyzes the transfer of the polypeptide chain attached to the tRNA in the __________ site to the aminoacyl-tRNA in the __________ site, is thought to be a(n)  __________ molecule and not a protein.

Accepted Answer

A)   A; P; rDNA
B)   P; A; tRNA
C)   A; P; mRNA
D)   P; A; rRNA
E)   P; A; sugar

Question 10

The poly-A tail is thought to faciliate the export of mRNA from the nucleus.
__________________

Accepted Answer

A) True 
 B)False

Question 11

Why is only one strand of DNA transcribed into mRNA?

Accepted Answer

A)   Because mRNA is only required in small quantities.
B)   Because transcribing both DNA strands would produce different amino acid sequences.
C)   Because the other strand would produce the same amino acid sequence in reverse order.
D)   Because all genes are located on the same DNA strand, while the other strand acts as protection.
E)   Because the other strand is transcribed directly into amino acids.

Question 12

Which of the following serves as an "adapter" in protein synthesis and bridges the gap between mRNA and proteins?

Accepted Answer

A)   tRNA
B)   cDNA
C)   rRNA
D)   promoter sequences
E)   DNA

Question 13

Translocation is the process whereby the __________ moves in order to place the tRNA bound to the growing polypeptide chain in the __________ site, thereby freeing the __________ site for a new aminoacyl-tRNA.

Accepted Answer

A)   mRNA; A; P
B)   ribosome; P; A
C)   tRNA; P; A
D)   ribosome; A; P
E)   tRNA; A; P

Question 14

What evolutionary role is served by the redundancy of the genetic code?

Accepted Answer

Concepts to Consider: The redu...

Question 15

In essentially all organisms, the AUG codon codes for:

Accepted Answer

A)   the initiation of translation.
B)   the termination of transcription.
C)   the termination of chain elongation.
D)   the amino acid valine.
E)   a termination tRNA molecule.

Question 16

Use a flow diagram to illustrate the flow of genetic information from DNA to protein.Include appropriate structures, chemical and cellular, as well as processes in your diagram.

Accepted Answer

The flow diagram should resemb...

Exam 13: Gene Expression

The poly-A tail is thought to faciliate the export of mRNA from the nucleus. __________________

Correct Answer
verified

A transposon is a DNA sequence that "jumps" into the middle of a gene. __________________

Correct Answer
verified

Frameshift mutations result from:

Correct Answer
verified

Use a flow diagram to illustrate the flow of genetic information from DNA to protein.Include appropriate structures, chemical and cellular, as well as processes in your diagram.

Correct Answer
verified
The flow diagram should resemb...
View Answer

A mutation that replaces one amino acid in a protein with another is called a __________ mutation.

Correct Answer
verified

Why is only one strand of DNA transcribed into mRNA?

Correct Answer
verified

How does the first nucleotide at the 5' end of a new mRNA chain differ from the other nucleotides in the chain?

Correct Answer
verified

Which of the following is made from DNA?

Correct Answer
verified

The 3' end of eukaryotic pre-mRNAs are changed by:

Correct Answer
verified

Figure 13-1 Use the figure to answer the corresponding question(s) . -RNA differs from DNA in all of the following except:

Correct Answer
verified

Translocation is the process whereby the moves in order to place the tRNA bound to the growing polypeptide chain in the site, thereby freeing the __ site for a new aminoacyl-tRNA.

Correct Answer
verified

What evolutionary role is served by the redundancy of the genetic code?

Correct Answer
verified
Concepts to Consider: The redu...
View Answer

In essentially all organisms, the AUG codon codes for:

Correct Answer
verified

The enzyme peptidyl transferase catalyzes peptide bond formation during the elongation stage of translation. __________________

Correct Answer
verified

Which of the following serves as an "adapter" in protein synthesis and bridges the gap between mRNA and proteins?

Correct Answer
verified

The enzyme peptidyl transferase, which catalyzes the transfer of the polypeptide chain attached to the tRNA in the site to the aminoacyl-tRNA in the site, is thought to be a(n) __ molecule and not a protein.

Correct Answer
verified

Exam 13: Gene Expression

The poly-A tail is thought to faciliate the export of mRNA from the nucleus. __________________

Correct AnswerverifiedShow Answer

A transposon is a DNA sequence that "jumps" into the middle of a gene. __________________

Correct AnswerverifiedShow Answer

Frameshift mutations result from:

Correct AnswerverifiedShow Answer

Use a flow diagram to illustrate the flow of genetic information from DNA to protein.Include appropriate structures, chemical and cellular, as well as processes in your diagram.

Correct AnswerverifiedThe flow diagram should resemb...View AnswerShow Answer

A mutation that replaces one amino acid in a protein with another is called a __________ mutation.

Correct AnswerverifiedShow Answer

Why is only one strand of DNA transcribed into mRNA?

Correct AnswerverifiedShow Answer

How does the first nucleotide at the 5' end of a new mRNA chain differ from the other nucleotides in the chain?

Correct AnswerverifiedShow Answer

Which of the following is made from DNA?

Correct AnswerverifiedShow Answer

The 3' end of eukaryotic pre-mRNAs are changed by:

Correct AnswerverifiedShow Answer

Figure 13-1 Use the figure to answer the corresponding question(s) . -RNA differs from DNA in all of the following except:

Correct AnswerverifiedShow Answer

Translocation is the process whereby the __________ moves in order to place the tRNA bound to the growing polypeptide chain in the __________ site, thereby freeing the __________ site for a new aminoacyl-tRNA.

Correct AnswerverifiedShow Answer

What evolutionary role is served by the redundancy of the genetic code?

Correct AnswerverifiedConcepts to Consider: The redu...View AnswerShow Answer

In essentially all organisms, the AUG codon codes for:

Correct AnswerverifiedShow Answer

The enzyme peptidyl transferase catalyzes peptide bond formation during the elongation stage of translation. __________________

Correct AnswerverifiedShow Answer

Which of the following serves as an "adapter" in protein synthesis and bridges the gap between mRNA and proteins?

Correct AnswerverifiedShow Answer

The enzyme peptidyl transferase, which catalyzes the transfer of the polypeptide chain attached to the tRNA in the __________ site to the aminoacyl-tRNA in the __________ site, is thought to be a(n) __________ molecule and not a protein.

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
The flow diagram should resemb...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Translocation is the process whereby the moves in order to place the tRNA bound to the growing polypeptide chain in the site, thereby freeing the __ site for a new aminoacyl-tRNA.

Correct Answer
verified

Correct Answer
verified
Concepts to Consider: The redu...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

The enzyme peptidyl transferase, which catalyzes the transfer of the polypeptide chain attached to the tRNA in the site to the aminoacyl-tRNA in the site, is thought to be a(n) __ molecule and not a protein.

Correct Answer
verified