Retake PPSC Biology 2021-Quiz-7-Molecular Biology

  1. The term molecular biology was first time used by __?
    a. Watson & Crick
    b. Maurice Wilkins
    c. William Astbury
    d. Fredrick Miescher
  2. Wobble hypothesis is proposed by _?
    a. J. Lederberg
    b. Francis Crick
    c. F. Jacob
    d. F. Sanger
  3. Who discovered the PCR?
    a. Stanford
    b. Karry Mullis
    c. Franklin Stahl
    d. Alec Jeffreys
  4. The transfer of genetic material and restoration of the ability to form capsule in bacteria is called as?
    a. Griffith effect
    b. Bacterial transformation
    c. Both
    d. None
  5. Which one have double stranded DNA?
    a. Wound tumor
    b. Reovirus
    c. Both
    d. None
  6. Which one is not a similarity between Z-DNA and B-DNA?
    a. Both are double helix
    b. The both strands of helix are antiparallel
    c. Both are right-handed helixes
    d. All are true
  7. Phosphate backbone of the _ is zigzag course?
    a. B-DNA
    b. Z-DNA
    c. Both
    d. None
  8. DNA polymerase is helper DNA polymerase?
    a. DNA polymerase I
    b. DNA polymerase II
    c. DNA polymerase III
    d. ALL
  9. DNA polymerase synthesize new strand from?
    a. 5 – 3 Direction
    b. 3 – 5 Direction
    c. Both have equal chances
    d. Depends on the species
  10. How many replicons are present in the DNA of E. Coli?
    a. 1
    b. 2
    c. 3
    d. 4
  11. Prevents supercoils?
    a. DNA helicase
    b. DNA gyrase
    c. DNA Topoisomerase
    d. Both b & c
  12. RNA primer is excised by the __?
    a. DNA polymerase I
    b. DNA polymerase II
    c. DNA gyrase
    d. DNA Topoisomerase
  13. Which one is non-genetic ribonucleic acid?
    a. RNA
    b. DNA
    c. Both
    d. None
  14. Which one is present in the nucleolus?
    a. RNA Polymerase I
    b. RNA Polymerase II
    c. RNA Polymerase III
    d. All
  15. Goldberg-Hogness Box
    a. TTGACA
    b. TATA
    c. CAAT
    d. TTCCCG
  16. Which one have no influence on the regulation of a gene?
    a. Promoters
    b. Enhancers
    c. Silencers
    d. All have influence
  17. Which one is insoluble and more stable RNA?
    a. mRNA
    b. rRNA
    c. tRNA
    d. All are soluble and stable
  18. Which one is not a post transcriptional modification of mRNA?
    a. Addition of &-MeG on 5Prime b. Addition of poly A tail on 3 Prime
    c. RNA splicing
    d. All are posttranscriptional modification
  19. How many introns are in alpha-globin gene?
    a. 1
    b. 2
    c. 3
    d. 4
  20. Average life of E. Coli mRNA is?
    a. 2 min
    b. 2 hours
    c. Several hours
    d. Several days
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