Question 1

Deoxyribose has a carbon atom that is not part of the pentose ring.In a nucleotide, what is attached to this carbon?

Accepted Answer

A) a nitrogenous base 
B) a phosphate group 
C) three hydrogen atoms 
D) one hydrogen atom 
A) a nitrogenous base 
B) a phosphate group 
C) three hydrogen atoms 
D) one hydrogen atom B

Question 2

When a mixture of live nonvirulent bacteria and dead virulent bacteria was injected into mice, Griffith unexpectedly found that the injected mice died.He explained this result by suggesting that the nonvirulent bacteria are being

Accepted Answer

A) activated. 
B) transformed. 
C) translated. 
D) transcribed. 
A) activated. 
B) transformed. 
C) translated. 
D) transcribed. B

Question 3

The site where the two original DNA strands separate and active replication occurs is called the

Accepted Answer

A) replication fork. 
B) replisome. 
C) primosome. 
D) lagging strand. 
A) replication fork. 
B) replisome. 
C) primosome. 
D) lagging strand. A

Question 4

Which is not a component of nucleic acids?

Accepted Answer

A) organic nitrogenous base 
B) pentose sugar 
C) phosphate 
D) sulfur 
A) organic nitrogenous base 
B) pentose sugar 
C) phosphate 
D) sulfur

Question 5

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 non-pathogenic to a pathogenic form. 
D) genetic material is transferred from one bacterial cell to another. 
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 non-pathogenic to a pathogenic form. 
D) genetic material is transferred from one bacterial cell to another.

Question 6

DNA replication always proceeds by adding new bases to the _______ end of an existing strand.

Accepted Answer

A) 1' 
B) 2' 
C) 3' 
D) 4' 
A) 1' 
B) 2' 
C) 3' 
D) 4'

Question 7

During replication, which enzyme unwinds the DNA double helix?

Accepted Answer

A) DNA primase 
B) DNA polymerase I 
C) DNA helicase 
D) DNA gyrase 
A) DNA primase 
B) DNA polymerase I 
C) DNA helicase 
D) DNA gyrase

Question 8

DNA consists of two antiparallel strands of nucleotides held together by

Accepted Answer

A) peptide bonds. 
B) covalent bonds. 
C) ionic bonds. 
D) hydrogen bonds. 
A) peptide bonds. 
B) covalent bonds. 
C) ionic bonds. 
D) hydrogen bonds.

Question 9

Which of the following statements about DNA replication is false?

Accepted Answer

A) The two strands are separated. 
B) Each existing strand is used as a template for making a new strand. 
C) Synthesis of both new strands is in the 5' to 3' direction. 
D) The newly synthesized DNA is packaged into one nucleus, and the original DNA is packaged into another nucleus. 
A) The two strands are separated. 
B) Each existing strand is used as a template for making a new strand. 
C) Synthesis of both new strands is in the 5' to 3' direction. 
D) The newly synthesized DNA is packaged into one nucleus, and the original DNA is packaged into another nucleus.

Question 10

Which enzyme adds new nucleotides to the end of a growing strand?

Accepted Answer

A) ligase 
B) polymerase 
C) gyrase 
D) helicase 
A) ligase 
B) polymerase 
C) gyrase 
D) helicase

Question 11

Chargaff's rules for the pairing of nitrogen bases is

Accepted Answer

A) A = C and G = T. 
B) A = T and G =C. 
C) A = G and C = T. 
A) A = C and G = T. 
B) A = T and G =C. 
C) A = G and C = T.

Question 12

Genetic analysis indicates that an unknown organism contains a gene that codes for a defective form of telomerase.Based on this information alone, you can conclude that this organism

Accepted Answer

A) is prokaryotic. 
B) is eukaryotic. 
C) has unusually long telomeres. 
D) has an increased risk of developing cancer. 
A) is prokaryotic. 
B) is eukaryotic. 
C) has unusually long telomeres. 
D) has an increased risk of developing cancer.

Question 13

The synthesis of a growing strand of DNA is carried out by adding nucleotides to the ___ end of an existing strand.

Accepted Answer

A) 2' 
B) 3' 
C) 5' 
D) 1' 
A) 2' 
B) 3' 
C) 5' 
D) 1'

Question 14

An organism has been found to contain a defective form of photolyase.What function might be impaired in this organism?r

Accepted Answer

A) Lengthening of the tips of chromosomes 
B) Repair of DNA damage caused by UV light 
C) Stabilization of single-stranded DNA during DNA replication 
D) Recognition of damaged DNA by the UvrABC complex 
A) Lengthening of the tips of chromosomes 
B) Repair of DNA damage caused by UV light 
C) Stabilization of single-stranded DNA during DNA replication 
D) Recognition of damaged DNA by the UvrABC complex

Question 15

Who proposed that in any DNA molecule, A =T and G = C?

Accepted Answer

A) Hershey and Chase 
B) Chargaff 
C) Franklin 
D) Watson and Crick 
A) Hershey and Chase 
B) Chargaff 
C) Franklin 
D) Watson and Crick

Question 16

Who proposed that the structure of DNA is a double helix with two polynucleotide chains running in opposite directions and held together by hydrogen bonding between pairs of nitrogenous bases?

Accepted Answer

A) Hershey and Chase 
B) Chargaff 
C) Franklin 
D) Watson and Crick 
A) Hershey and Chase 
B) Chargaff 
C) Franklin 
D) Watson and Crick

Question 17

Avery and his coworkers showed that the agent responsible for changing nonvirulent bacteria into virulent bacteria was

Accepted Answer

A) protein. 
B) polysaccharide. 
C) DNA. 
D) RNA. 
A) protein. 
B) polysaccharide. 
C) DNA. 
D) RNA.

Question 18

Avery, MacLeod, and McCarty's experiments revealed that the transforming principle had all of the following properties except

Accepted Answer

A) its activity was destroyed by treatment with proteases. 
B) its activity was unaffected by RNA-digesting enzymes. 
C) its activity was unaffected by lipid extraction. 
D) its activity was destroyed by treatment with DNA endonucleases. 
A) its activity was destroyed by treatment with proteases. 
B) its activity was unaffected by RNA-digesting enzymes. 
C) its activity was unaffected by lipid extraction. 
D) its activity was destroyed by treatment with DNA endonucleases.

Question 19

In DNA, complementary nitrogen bases are held together by

Accepted Answer

A) nitrogen bonds. 
B) hydrogen bonds. 
C) hydrophobic bonds. 
D) peptide bonds. 
A) nitrogen bonds. 
B) hydrogen bonds. 
C) hydrophobic bonds. 
D) peptide bonds.

Question 20

After DNA replication is complete, each strand of the original molecule is bound to a new complementary strand.This process is known as

Accepted Answer

A) disruptive replication. 
B) conservative replication. 
C) semiconservative replication. 
D) dispersive replication. 
A) disruptive replication. 
B) conservative replication. 
C) semiconservative replication. 
D) dispersive replication.

Exam 14: Dna: the Genetic Material

Deoxyribose has a carbon atom that is not part of the pentose ring.In a nucleotide, what is attached to this carbon?

When a mixture of live nonvirulent bacteria and dead virulent bacteria was injected into mice, Griffith unexpectedly found that the injected mice died.He explained this result by suggesting that the nonvirulent bacteria are being

The site where the two original DNA strands separate and active replication occurs is called the

Which is not a component of nucleic acids?

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

DNA replication always proceeds by adding new bases to the _______ end of an existing strand.

During replication, which enzyme unwinds the DNA double helix?

DNA consists of two antiparallel strands of nucleotides held together by

Which of the following statements about DNA replication is false?

Which enzyme adds new nucleotides to the end of a growing strand?

Chargaff's rules for the pairing of nitrogen bases is

Genetic analysis indicates that an unknown organism contains a gene that codes for a defective form of telomerase.Based on this information alone, you can conclude that this organism

The synthesis of a growing strand of DNA is carried out by adding nucleotides to the ___ end of an existing strand.

An organism has been found to contain a defective form of photolyase.What function might be impaired in this organism?r

Who proposed that in any DNA molecule, A =T and G = C?

Who proposed that the structure of DNA is a double helix with two polynucleotide chains running in opposite directions and held together by hydrogen bonding between pairs of nitrogenous bases?

Avery and his coworkers showed that the agent responsible for changing nonvirulent bacteria into virulent bacteria was

Avery, MacLeod, and McCarty's experiments revealed that the transforming principle had all of the following properties except

In DNA, complementary nitrogen bases are held together by

After DNA replication is complete, each strand of the original molecule is bound to a new complementary strand.This process is known as

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