Your Federal Quarterly Tax Payments are due April 15th Get Help Now >>

Microbial Genetics by gegeshandong

VIEWS: 10 PAGES: 5

									                             Microbial Genetics
Which of the following functions might be associated with genes carried on a bacterial plasmid?




      A. antibiotic resistance

      B. cellular reproduction

      C. metabolism

      D. growth




Which of the following types of plasmids is associated with bacterial conjugation?




      A. resistance factors

      B. virulence plasmids

      C. bacteriocin factors

      D. fertility factors




All of the following are events associated with RNA processing in eukaryotic cells EXCEPT




      A. transversion.

      B. capping.

      C. splicing.

      D. polyadenylation.




All of the following are associated with the process of DNA replication EXCEPT:




      A. sigma factors.

      B. DNA ligase.

      C. primase.

      D. helicases.




All of the following are functions of DNA methylation EXCEPT
       A. control of gene expression.

       B. DNA repair.

       C. protection against viral infection.

       D. DNA mutation.




All of the following are true statements concerning the replication of DNA EXCEPT:




       A. Proofreading occurs as DNA replication proceeds.

       B. DNA primers are replaced with RNA.

       C. The lagging strand is synthesized discontinuously.

       D. Each Okazaki fragment is about 1,000 nucleotides long.




All of the following are characteristics of RNA polymerase EXCEPT:




       A. incorporates ribonucleotides

       B. relatively slow polymerization

       C. proofreads

       D. does not require helicase




Which of the following is involved in the regulation of translation in cells?




       A. operators

       B. exons

       C. ethidium bromide

       D. antisense RNA




All of the following are characteristics of the genetic code EXCEPT:




       A. Most organisms use the same genetic code.
      B. More than one amino acid is associated with each codon.

      C. More than one codon is associated with each amino acid.

      D. There are 64 possible codons.




Which of the following is a molecule involved in transcription termination in prokaryotic cells?




      A. Rho

      B. sigma factor

      C. release factor

      D. anticodon




All of the following are associated with prokaryotic transcription EXCEPT:




      A. it occurs in the cytosol.

      B. it involves three types of RNA polymerase.

      C. it uses sigma factors.

      D. there are no introns in mRNA molecules.




Which of the following stages of translation does NOT require energy in the form of GTP?




      A. initiation

      B. termination

      C. elongation

      D. All of these stages require GTP energy.




Which of the following is the regulatory sequence responsible for control of an operon?




      A. the promoter

      B. the release factor

      C. the corepressor
      D. the operator




All of the following are true statements concerning genetic mutations EXCEPT:




      A. Gene mutations always result in problems for cells and organisms.

      B. A mutation is any change in the nucleotide base sequence of an organism's genome.

      C. Mutations in asexual organisms are usually passed on to the offspring.

      D. A point mutation is the most common type of mutation.




Which of the following types of point mutations is usually the most serious?




      A. frameshift

      B. substitution

      C. silent

      D. transposition




Ethidium bromide is an example of which of the following?




      A. a nucleotide-altering chemical

      B. a frameshift mutagen

      C. a nucleotide analog

      D. a pyrimidine dimer




Which of the following DNA repair mechanisms is designed to cope with the most common type of DNA
damage?



      A. the SOS response

      B. mismatch repair

      C. light repair

      D. base-excision repair
All of the following are associated with the Ames test EXCEPT:




      A. histidine auxotrophs.

      B. liver enzymes.

      C. an F plasmid.

      D. Salmonella.




Hfr cells are associated with which of the following?




      A. transformation

      B. conjugation

      C. transposons

      D. transduction




All of the following are true statements concerning transposons EXCEPT:




      A. Transposons are often called "jumping genes."

      B. Transposons are found only in prokaryotic cells.

      C. All transposons contain palindromic sequences at their ends.

      D. A special enzyme is needed for the insertion of some transposons.

								
To top