Biotechnology Questions-2

  1. Distance between two successive nitrogenous bases or base pairs of DNA is
    (a) 34 Å
    (b) 3.4 Å
    © 10 Å
    (d) 5 Å Answer: (b)

  2. DNA and RNA are similar in having
    (a) Similar nucleotides
    (b) Similar pyrimidines
    © Similar purines
    (d) Similar sugars Answer: ©

  3. DNA and RNA show similarity in having
    (a) Polymers of nucleotides
    (b) Similar pyrimidines
    © Double strands
    (d) Similar sugars Answer: (a)

  4. DNA does not occur in
    (a) Nucleus
    (b) Ribosomes
    © Mitochondria
    (d) Plastids Answer: (b)

  5. DNA duplex shows
    (a) Right handed coiling and parallel
    (b) Right handed coiling and antiparallel
    © Left handed coiling and antiparallel
    (d) Left handed coiling and parallel Answer: (b)

  6. DNA is composed of repeating units of
    (a) Ribonucleosides
    (b) Deoxyribonucleosides
    © Ribonucleotides
    (d) Deoxyribonucleotides Answer: (d)

  7. DNA replication in eucaryotes commences
    (a) From both ends of a chromosome simultaneously
    (b) Several sites along DNA of a chromosome simultaneously
    © From centromere to either end
    (d) From one end of chromosome to the other Answer: (b)

  8. DNA replication is
    (a) Conservative and discontinuous
    (b) Semiconservative and semidiscontinuous
    © Semiconservative and discontinuous
    (d) Conservative Answer: ©

  9. DNA resembles RNA as both have
    (a) Polymers of nucleotides
    (b) Similar sugars
    © Similar pyrimidine bases
    (d) Ability to replicate Answer: (a)

  10. DNA sequence is ATG. What would be the sequence of bases in anticodon of tRNA
    (a) ATG
    (b) AUG
    © UAC

(d) TAC Answer: (b)
11. DNA sequence is TAG. What shall be the sequence in anticodon of tRNA
(a) UAG
(b) ATC
© ATG
(d) UAC Answer: (a)

  1. DNA sequence of ATTCGATG is transcribed as
    (a) AUUCGAUG
    (b) UAAGCUAC
    © CAUCGAAU
    (d) GUAGCUUA Answer: (b)

  2. DNA strand with nitrogen base sequence ATTGCC will have sequence in mRNA
    (a) UAACGC
    (b) ATCGCC
    © ATTGCA
    (d) AGGACC Answer: (a)

  3. Double chained DNA strand is made radioactive in both its chains. It is
    allowed to replicate twice in non-radioactive medium. The result would be
    (a) All strands have radioactivity
    (b) Half the strands have radioactivity
    © Three strands have radioactivity
    (d) Radioactivity is absent in all strands Answer: (b)

  4. Double helical structure of DNA was proposed by
    (a) Kornberg
    (b) Nirenberg
    © Watson and Crick
    (d) Wilkins and Franklin Answer: ©

  5. Functional unit of gene that specifies synthesis of one polypeptide is
    (a) Codon
    (b) Cistron
    © Recon
    (d) Muton Answer: (b)

  6. Gene is segment of
    (a) RNA
    (b) DNA
    © RNA or DNA
    (d) Both DNA and RNA Answer: (b)

  7. Genetically engineered bacteria are being used in commercial production of
    (a) Melatonin
    (b) Testoteron
    © Human insuline
    (d) Thyroxine Answer: ©

  8. Haploid plant cultures are got from
    (a) Leaves
    (b) Root tip
    © Pollen grain
    (d) Buds Answer: ©

  9. Hydrogen bonds present between cytosine and guanosine are
    (a) 2
    (b) 3
    © 1
    (d) 4 Answer: (b)