Question 1

If a mutation produced helicase that was unable to hydrolyze ATP,DNA replication would be

Accepted Answer

A)  stopped.
B)  speeded up.
C)  unaffected.
D)  more prone to errors.E) B) and D)
F) A) and B)

Question 2

You decide to repeat the Meselson-Stahl experiment,except this time you plan to grow the E.coli cells on light 14N medium for many generations and then transfer them to heavy 15N medium and allow them to grow for 2 additional generations (2 rounds of DNA replication) .If the conservative model of DNA replication was correct,what is the expected distribution of DNA in the density gradient after two rounds of replication?

Accepted Answer

A)  One band of intermediate density.
B)  One band of light density.
C)  One band of heavy density.
D)  One band of light density and one band of heavy density.
E)  One band of light density and one band of intermediate density.F) A) and E)
G) B) and D)

Question 3

Viruses that attack bacteria are called

Accepted Answer

A)  phages
B)  proviruses
C)  virulent
D)  lyticE) A) and D)
F) B) and C)

Question 4

Because the two strands of a DNA molecule are ________ to each other,either one can be used as a template to reconstruct the other.

Accepted Answer

A)  identical
B)  antiparallel
C)  bound
D)  complementaryE) A) and B)
F) B) and C)

Question 5

During replication,which enzyme unwinds the DNA double helix?

Accepted Answer

A)  DNA primase
B)  DNA polymerase I
C)  DNA helicase
D)  DNA gyrase
E)  DNA ligaseF) C) and E)
G) All of the above

Question 6

Griffith,a British microbiologist,used bacteria and mice to demonstrate the process of transformation.During transformation,

Accepted Answer

A)  a bacterial chromosome produces an exact copy of itself.
B)  the nucleus of a mouse cell repairs itself when damaged by bacterial infection.
C)  DNA from an infected mouse cell changes bacteria from a nonpathogenic to a pathogenic form.
D)  genetic material is transferred from one bacterial cell to another.
E)  a bacterial cell is transformed into a spore during unsuitable environmental conditions.F) C) and E)
G) C) and D)

Question 7

Endonucleases and exonucleases are enzymes that can remove nucleotides from a polynucleotide chain.An endonuclease removes nucleotides ________ while an exonuclease removes nucleotides ________.

Accepted Answer

A)  from the 5' end of the chain; from the 3' end of the chain
B)  from the 3' end of the chain; from the 5' end of the chain
C)  internally; from the ends of the chain
D)  from the ends of the chain; internallyE) B) and D)
F) B) and C)

Question 8

In DNA,a purine must always pair with a pyrimidine and vice versa in order to ensure that

Accepted Answer

A)  the distance between the two phosphodiester backbones remains constant.
B)  the two strands are antiparallel.
C)  the distance between one base pair and the next remains constant.
D)  each base pair is held together by three hydrogen bonds.E) B) and C)
F) All of the above

Exam 14: Dna: the Genetic Material

If a mutation produced helicase that was unable to hydrolyze ATP,DNA replication would be

Correct Answer
verified

Endonucleases and exonucleases are enzymes that can remove nucleotides from a polynucleotide chain.An endonuclease removes nucleotides while an exonuclease removes nucleotides .

Correct Answer
verified

During replication,which enzyme unwinds the DNA double helix?

Correct Answer
verified

Viruses that attack bacteria are called

Correct Answer
verified

Correct Answer
verified

In DNA,a purine must always pair with a pyrimidine and vice versa in order to ensure that

Correct Answer
verified

Because the two strands of a DNA molecule are ________ to each other,either one can be used as a template to reconstruct the other.

Correct Answer
verified

Griffith,a British microbiologist,used bacteria and mice to demonstrate the process of transformation.During transformation,

Correct Answer
verified

Exam 14: Dna: the Genetic Material

If a mutation produced helicase that was unable to hydrolyze ATP,DNA replication would be

Correct AnswerverifiedShow Answer

Endonucleases and exonucleases are enzymes that can remove nucleotides from a polynucleotide chain.An endonuclease removes nucleotides ________ while an exonuclease removes nucleotides ________.

Correct AnswerverifiedShow Answer

During replication,which enzyme unwinds the DNA double helix?

Correct AnswerverifiedShow Answer

Viruses that attack bacteria are called

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

In DNA,a purine must always pair with a pyrimidine and vice versa in order to ensure that

Correct AnswerverifiedShow Answer

Because the two strands of a DNA molecule are ________ to each other,either one can be used as a template to reconstruct the other.

Correct AnswerverifiedShow Answer

Griffith,a British microbiologist,used bacteria and mice to demonstrate the process of transformation.During transformation,

Correct AnswerverifiedShow Answer

Correct Answer
verified

Endonucleases and exonucleases are enzymes that can remove nucleotides from a polynucleotide chain.An endonuclease removes nucleotides while an exonuclease removes nucleotides .

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified