Bio 205 Exam 3 With The Correct
Answers
C) a sequence of nucleotides in DNA that codes for a functional product. - CORRECT ANSWER✔✔A gene
is best defined as
A) any random segment of DNA.
B) three nucleotides that code for an amino acid.
C) a sequence of nucleotides in DNA that codes for a functional product.
D) a sequence of nucleotides in RNA that codes for a functional product.
E) the RNA product of a transcribed section of DNA.
B) RNA polymerase — makes a molecule of RNA from an RNA template - CORRECT ANSWER✔✔Which
of the following pairs is mismatched?
A) DNA polymerase — makes a molecule of DNA from a DNA template
B) RNA polymerase — makes a molecule of RNA from an RNA template
C) DNA ligase — joins segments of DNA
E) DNA gyrase — coils and twists DNA
D) DNA replication proceeds in only one direction around the bacterial chromosome.
Explanation: Replication is bidirectional and there are 2 replication forks when a replication bubble
forms. - CORRECT ANSWER✔✔Which of the following statements is FALSE?
,A) DNA polymerase joins nucleotides in one direction (5' to 3') only.
B) The leading strand of DNA is made continuously.
C) The lagging strand of DNA is started by an RNA primer.
D) DNA replication proceeds in only one direction around the bacterial chromosome.
E) Multiple replication forks are possible on a bacterial chromosome.
C) two strands of nucleotides running in an antiparallel configuration. - CORRECT ANSWER✔✔DNA is
constructed of
A) a single strand of nucleotides with internal hydrogen bonding.
B) two complementary strands of nucleotides bonded A—C and G—T.
C) two strands of nucleotides running in an antiparallel configuration.
D) two strands of identical nucleotides in a parallel configuration with hydrogen bonds between them.
E) None of the answers is correct.
A) a new strand of DNA
Explanation: All RNA products have to come from DNA codes, by means of transcription - CORRECT
ANSWER✔✔Which of the following is NOT a product of transcription?
A) a new strand of DNA
B) rRNA
C) tRNA
D) mRNA
E) None of the answers are correct; all of these are products of transcription.
A) inducible enzyme. - CORRECT ANSWER✔✔An enzyme produced in response to the presence of a
substrate is called a(n)
A) inducible enzyme.
, B) repressible enzyme.
C) restriction enzyme.
D) operator.
E) promoter.
A) by a bacteriophage. - CORRECT ANSWER✔✔Transformation is the transfer of DNA from a donor to a
recipient cell
A) by a bacteriophage.
B) as naked DNA in solution.
C) by cell-to-cell contact.
D) by crossing over.
E) by sexual reproduction.
E) All of the answers are correct. - CORRECT ANSWER✔✔Genetic change in bacteria can be brought
about by
A) mutation.
B) conjugation.
C) transduction.
D) transformation.
E) All of the answers are correct.
D) It is F+. - CORRECT ANSWER✔✔Which of the following statements regarding a bacterium that is R+
(Resistance gene+) is FALSE?
A) It possesses a plasmid.
B) R+ can be transferred to a cell of the same species.
C) It is resistant to certain drugs and heavy metals.
D) It is F+.
Answers
C) a sequence of nucleotides in DNA that codes for a functional product. - CORRECT ANSWER✔✔A gene
is best defined as
A) any random segment of DNA.
B) three nucleotides that code for an amino acid.
C) a sequence of nucleotides in DNA that codes for a functional product.
D) a sequence of nucleotides in RNA that codes for a functional product.
E) the RNA product of a transcribed section of DNA.
B) RNA polymerase — makes a molecule of RNA from an RNA template - CORRECT ANSWER✔✔Which
of the following pairs is mismatched?
A) DNA polymerase — makes a molecule of DNA from a DNA template
B) RNA polymerase — makes a molecule of RNA from an RNA template
C) DNA ligase — joins segments of DNA
E) DNA gyrase — coils and twists DNA
D) DNA replication proceeds in only one direction around the bacterial chromosome.
Explanation: Replication is bidirectional and there are 2 replication forks when a replication bubble
forms. - CORRECT ANSWER✔✔Which of the following statements is FALSE?
,A) DNA polymerase joins nucleotides in one direction (5' to 3') only.
B) The leading strand of DNA is made continuously.
C) The lagging strand of DNA is started by an RNA primer.
D) DNA replication proceeds in only one direction around the bacterial chromosome.
E) Multiple replication forks are possible on a bacterial chromosome.
C) two strands of nucleotides running in an antiparallel configuration. - CORRECT ANSWER✔✔DNA is
constructed of
A) a single strand of nucleotides with internal hydrogen bonding.
B) two complementary strands of nucleotides bonded A—C and G—T.
C) two strands of nucleotides running in an antiparallel configuration.
D) two strands of identical nucleotides in a parallel configuration with hydrogen bonds between them.
E) None of the answers is correct.
A) a new strand of DNA
Explanation: All RNA products have to come from DNA codes, by means of transcription - CORRECT
ANSWER✔✔Which of the following is NOT a product of transcription?
A) a new strand of DNA
B) rRNA
C) tRNA
D) mRNA
E) None of the answers are correct; all of these are products of transcription.
A) inducible enzyme. - CORRECT ANSWER✔✔An enzyme produced in response to the presence of a
substrate is called a(n)
A) inducible enzyme.
, B) repressible enzyme.
C) restriction enzyme.
D) operator.
E) promoter.
A) by a bacteriophage. - CORRECT ANSWER✔✔Transformation is the transfer of DNA from a donor to a
recipient cell
A) by a bacteriophage.
B) as naked DNA in solution.
C) by cell-to-cell contact.
D) by crossing over.
E) by sexual reproduction.
E) All of the answers are correct. - CORRECT ANSWER✔✔Genetic change in bacteria can be brought
about by
A) mutation.
B) conjugation.
C) transduction.
D) transformation.
E) All of the answers are correct.
D) It is F+. - CORRECT ANSWER✔✔Which of the following statements regarding a bacterium that is R+
(Resistance gene+) is FALSE?
A) It possesses a plasmid.
B) R+ can be transferred to a cell of the same species.
C) It is resistant to certain drugs and heavy metals.
D) It is F+.
