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CNM Microbiology Exam 3 Questions And Correct Answers
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CNM Microbiology Exam 3 Questions AndCorrect Answers
How many RNA bases are in a single codon for an amino acid? ANSWER 3
Which one of the following antibiotics inhibits peptide bond formation within a
ribosome? ANSWER Macrolide
The specially engineered strain of Salmonella used in the AMES test is unable to
produce one essential amino acid and cannot grow in agar unless that amino acid is
added to the media. What is it? ANSWER Histidine
Which HIV enzyme is responsible for the processing of viral polypeptide and final
assembly of new viruses - ANSWER Protease
What type of chemical bond brings two nitrogenous bases together in the DNA double
helix? - ANSWER Hydrogen
What kind of genetic operon regulation is controlled by levels of tryptophan in the
bacterial cell? - ANSWER Repressed
Which class of RNA serves as a template for making proteins? - ANSWER mRNA
Nucleoside analogs induce DNA sequence mutagenesis by the incorporation into the
newly replicated DNA strand by DNA Polymerase, then on subsequent rounds of
replication bonding with the incorrect base, thus effecting a change in DNA sequence.
Which of the following enzymes removes the RNA primers and replaces them with DNA
at the replication fork? - ANSWER DNA Polymerase I
, What is the name of the start site of transcription? -ANSWER Promoter
What is the name of the enzyme that relaxes the DNA molecule ahead of the replication
fork? -ANSWER DNA Gyrase
What is the name of the genetic process of making a copy of DNA from a DNA template?
-ANSWER Replication
Which of the following mutations would NOT affect regulation of expression of a genetic
operon? -ANSWER Mutation within a structural gene of the operon
Which RNA product is associated with an anti-codon? - ANSWER tRNA
Which of the following drugs alters the shape of the ribosome small unit thereby leading
to a misread of the genetic code? - ANSWER Aminoglycoside
Which of the following can take either DNA or RNA as its genome? - ANSWER Virus
What is the genetic process that produces a copy of RNA from the template DNA? -
ANSWER Transcription
Where would you find Okazaki fragments on which strand of DNA at the replication fork?
- ANS Lagging strand
Which of the following would you NOT find associated with a molecule of RNA? - ANS
Thymine
Which of the following best describes how fluoroquinolones kill bacterial cells? - ANS b.
They stack into tetrads and insert into open space created by topoisomerases
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