DNA Repair And Mutation
Answer each accordingly
- 1.The flow of genetic material in microbial cells usually proceeds from
- A.
Proteins through RNA to DNA
- B.
RNA through DNA to proteins
- C.
DNA through RNA to proteins
- 2.A new copy of a DNA molecule is precisely synthesized during a process called
- A.
Translation
- B.
Transcription
- C.
Replication
- 3.The final step in gene expression is protein synthesis, or
- A.
Translation
- B.
Transcription
- C.
Replication
- 4.The chromosome of almost all bacteria is in the shape of
- A.
An open circle
- B.
A closed circle
- C.
A linear chromosome
- 5.The enzyme that catalyzes the synthesis of DNA is called
- A.
Helicase
- B.
DNA gyrase
- C.
DNA polymerase
- 6.DNA polymerase catalyzes the synthesis of DNA in the
- A.
3' to 5' direction
- B.
5' to 3' direction
- C.
5' to 7' direction
- D.
7' to 5' direction
- 7.The actual process of protein synthesis takes place on ribosomes that serve as workbenches, with _____________ acting as the blueprint or template.
- 8.The bases of one strand of DNA match-up with the bases of the second strand according to base pairing rules, therefore, the two strands are said to be
- A.
Oppositely charged
- B.
Identical
- C.
Complementary
- 9.The enzymes that unwind short stretches of DNA helix immediately ahead of a replication fork are
- A.
DNA gyrase
- B.
Topoisomerases
- C.
Helicases
- D.
Single-stranded binding proteins
- E.
DNA ligase
- 10.The enzyme that repairs nicked DNA by forming a phosphodiester bond between adjacent nucleotides is
- A.
DNA ligase
- B.
DNA gyrase
- C.
Topoisomerases
- D.
Single-stranded binding proteins
- E.
Helicases
- 11.Another name for the RNA polymerase recognition/binding site upstream of a gene is the
- 12.The ____________ is nontranslated sequence that is located between the transcription start site and the translation start site
- 13.The Shine-Dalgarno sequence is
- A.
The reading frame of a gene
- B.
A short sequence that acts as a ribosomal binding site
- C.
Another name for a stop codon
- 14.Most procaryotic proteins begin with this modified amino acid
- A.
N-formylmethionine
- B.
N-formylleucine
- C.
N-formylserine
- 15.Mutations that arise without exposure to external agents are called
- A.
Induced mutations
- B.
Analogous mutations
- C.
Spontaneous mutations
- 16.A mutagen is
- A.
A chemical or physical agent that induces mutations
- B.
An enzyme that repairs mutations
- C.
A molecule which stabilizes DNA thus prevents mutations from occurring
- 17.A mutation that affects only a single nucleotide is called
- A.
A regional mutation
- B.
A site mutation
- C.
A point mutation
- 18.
![A nonsense mutation results in - ProProfs]( "A nonsense mutation results in")
A nonsense mutation results in- A.
an abnormal elongation of a polypeptide
- B.
A premature termination of the synthesis of a polypeptide
- C.
A large deletion within the reading frame of a gene
- 19.The process by which thymine dimers are directly repaired with the help of visible light is called
- A.
Photosynthesis
- B.
Excision repair
- C.
Photoreactivation
- 20.DNA repair mechanisms are able to distinguish newly synthesized DNA strands from older strands because
- A.
New strands do not contain cytosine bases
- B.
Old strands are methylated while new strands are not
- C.
New strands are methylated while old strands are not
- 21.
![The ability of the anticodon of tRNA to interact with multiple codons of mRNA is called - ProProfs]( "The ability of the anticodon of tRNA to interact with multiple codons of mRNA is called")
The ability of the anticodon of tRNA to interact with multiple codons of mRNA is called- A.
Wobble
- B.
Stagger
- C.
Promiscuity
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Sample QuestionWhich of the following is TRUE about mutation
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