Question 1

Which of the following statements is TRUE concerning mRNA?

Accepted Answer

A)   mRNA has a very short half-life.
B)   mRNA has complex secondary structure.
C)   mRNA is catalytic.
D)   mRNA is the product of translation.

Question 2

Termination of RNA synthesis is ultimately determined by

Accepted Answer

A)   exhaustion of RNA polymerase activity.
B)   special protein factors.
C)   terminases.
D)   specific nucleotide sequences on the template strand.

Question 3

Supercoiling is important for DNA structure,because

Accepted Answer

A)   it holds together the antiparallel strands of DNA in the double helix.
B)   it provides energy for transcription.
C)   it condenses the DNA so that it can fit inside the cell.
D)   it prevents RNA from pairing with DNA in the double helix.

Question 4

Transfer RNA molecules

Accepted Answer

A)   function to transfer ribonucleotides to RNA polymerase during transcription.
B)   function to transfer the correct amino acids to the ribosome during translation.
C)   contain codons that bind to ribosomes during translation.
D)   are only present in the nucleus or eukaryotes.

Question 5

rRNA has an enzymatic role in all stages of protein synthesis.

Accepted Answer

A) True 
 B)False

Question 6

DNA participates in protein synthesis through

Accepted Answer

A)   cyclic messengers.
B)   direct pairing with amino acids.
C)   an RNA intermediate.
D)   protein folding.

Question 7

The following is the sequence of bases in the sense strand of a DNA segment and contains the beginning of a gene.
DNA 3' A T A T T A C C A G G C A T G G A C C C C C G G G 5'
Based on this sequence,write the sequence of the anti-sense DNA strand and the mRNA.Label the 5' and 3' ends in your predicted sequences.The start codon in this organism is AUG.Indicate where the start codon is in your sequence.Why is the start codon important? Why does there have to be a specific start codon?

Accepted Answer

The start codon is bolded and underlin...

Question 8

DNA replication is bidirectional in prokaryotes with circular chromosomes.

Accepted Answer

A) True 
 B)False

Question 9

Proteins known as chaperones are found only in Bacteria.

Accepted Answer

A) True 
 B)False

Question 10

Which of the following is an example of one codon?

Accepted Answer

A)   CATT
B)   GCCATT
C)   CAG
D)   CCGUAA

Question 11

Speculate why the half-life of mRNA is short,while the half-lives of rRNA and tRNA are long.

Accepted Answer

An important feature present in rRNA and...

Question 12

Genes that encoded for polymerases,gyrases,ribosomal proteins,and other proteins essential to replication,transcription,and translation are present on

Accepted Answer

A)   chromosomes.
B)   plasmids.
C)   chromosomes and plasmids.
D)   neither chromosomes nor plasmids.

Question 13

Polycistronic transcription units are common in

Accepted Answer

A)   Archaea.
B)   Bacteria.
C)   Eukarya.
D)   both Archaea and Bacteria.

Question 14

You experimentally change the DNA sequence directly upstream of a start codon of an operon in E.coli to investigate the function of this region of DNA.Analysis reveals that after the change the same amount of mRNA is made from the operon,but there are very few proteins made from the operon.What is the most likely function of the DNA sequence that you changed?

Accepted Answer

A)   The DNA sequence likely functions as a ribosome-binding site.
B)   The DNA sequence likely functions as a promoter.
C)   The DNA sequence likely functions as a termination sequence.
D)   The DNA sequence likely functions as in transcriptional regulation.

Question 15

tRNA is released from the ribosome at the ________ site.

Accepted Answer

A)   P
B)   A
C)   R
D)   E

Question 16

Most prokaryotic genomes are double-stranded circular DNA.

Accepted Answer

A) True 
 B)False

Question 17

In ________ several ribosomes can simultaneously translate a single mRNA molecule in a complex called a(n) ________.

Accepted Answer

A)   prokaryotes / polysome
B)   eukaryotes / polysome
C)   prokaryotes / initiation complex
D)   eukaryotes / splicing complex

Question 18

Explain the difference between an intrinsic terminator and a Rho-dependent termination site.

Accepted Answer

Intrinsic terminators occur at the nucle...

Question 19

Transposable elements are

Accepted Answer

A)   segments of DNA that move from one site to another.
B)   transcribed genes.
C)   segments of RNA that are involved in transposing DNA into proteins.
D)   proteins that aid in the secretion of enzymes out of the cell.

Question 20

The functional unit of genetic information is the

Accepted Answer

A)   nucleotide.
B)   gene.
C)   chromosome.
D)   protein.

Exam 4: Molecular Biology

Polycistronic transcription units are common in

Correct Answer
verified

DNA participates in protein synthesis through

Correct Answer
verified

Supercoiling is important for DNA structure,because

Correct Answer
verified

Proteins known as chaperones are found only in Bacteria.

Correct Answer
verified

Transfer RNA molecules

Correct Answer
verified

rRNA has an enzymatic role in all stages of protein synthesis.

Correct Answer
verified

Which of the following is an example of one codon?

Correct Answer
verified

Most prokaryotic genomes are double-stranded circular DNA.

Correct Answer
verified

Termination of RNA synthesis is ultimately determined by

Correct Answer
verified

The functional unit of genetic information is the

Correct Answer
verified

DNA replication is bidirectional in prokaryotes with circular chromosomes.

Correct Answer
verified

Which of the following statements is TRUE concerning mRNA?

Correct Answer
verified

Transposable elements are

Correct Answer
verified

Explain the difference between an intrinsic terminator and a Rho-dependent termination site.

Correct Answer
verified
Intrinsic terminators occur at the nucle...
View Answer

Speculate why the half-life of mRNA is short,while the half-lives of rRNA and tRNA are long.

Correct Answer
verified
An important feature present in rRNA and...
View Answer

Correct Answer
verified

Correct Answer
verified

The start codon is bolded and underlin...
View Answer

In several ribosomes can simultaneously translate a single mRNA molecule in a complex called a(n) .

Correct Answer
verified

tRNA is released from the ribosome at the ________ site.

Correct Answer
verified

Genes that encoded for polymerases,gyrases,ribosomal proteins,and other proteins essential to replication,transcription,and translation are present on

Correct Answer
verified

Exam 4: Molecular Biology

Polycistronic transcription units are common in

Correct AnswerverifiedShow Answer

DNA participates in protein synthesis through

Correct AnswerverifiedShow Answer

Supercoiling is important for DNA structure,because

Correct AnswerverifiedShow Answer

Proteins known as chaperones are found only in Bacteria.

Correct AnswerverifiedShow Answer

Transfer RNA molecules

Correct AnswerverifiedShow Answer

rRNA has an enzymatic role in all stages of protein synthesis.

Correct AnswerverifiedShow Answer

Which of the following is an example of one codon?

Correct AnswerverifiedShow Answer

Most prokaryotic genomes are double-stranded circular DNA.

Correct AnswerverifiedShow Answer

Termination of RNA synthesis is ultimately determined by

Correct AnswerverifiedShow Answer

The functional unit of genetic information is the

Correct AnswerverifiedShow Answer

DNA replication is bidirectional in prokaryotes with circular chromosomes.

Correct AnswerverifiedShow Answer

Which of the following statements is TRUE concerning mRNA?

Correct AnswerverifiedShow Answer

Transposable elements are

Correct AnswerverifiedShow Answer

Explain the difference between an intrinsic terminator and a Rho-dependent termination site.

Correct AnswerverifiedIntrinsic terminators occur at the nucle...View AnswerShow Answer

Speculate why the half-life of mRNA is short,while the half-lives of rRNA and tRNA are long.

Correct AnswerverifiedAn important feature present in rRNA and...View AnswerShow Answer

Correct AnswerverifiedShow Answer

Correct Answerverified The start codon is bolded and underlin...View AnswerShow Answer

In ________ several ribosomes can simultaneously translate a single mRNA molecule in a complex called a(n) ________.

Correct AnswerverifiedShow Answer

tRNA is released from the ribosome at the ________ site.

Correct AnswerverifiedShow Answer

Genes that encoded for polymerases,gyrases,ribosomal proteins,and other proteins essential to replication,transcription,and translation are present on

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified
Intrinsic terminators occur at the nucle...
View Answer

Correct Answer
verified
An important feature present in rRNA and...
View Answer

Correct Answer
verified

Correct Answer
verified

The start codon is bolded and underlin...
View Answer

In several ribosomes can simultaneously translate a single mRNA molecule in a complex called a(n) .

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified