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NEET - 2021 Previous Year Questions



NEET Biology Previous Year Questions - 2021

The production of gametes by the parents, formation of zygotes, the F1 and F2 plants, can be understood from a diagram called:

[class-xii ]

  • Bullet square
  • Punch square
  • Punnett square
  • Net square
  • Correct Option: C  [ Punnett square ]

    Remark:

Complete the flow chart on central dogma.

Image

[class-xii ]

  • (A)-Replication; (B)-Transcription; (C)-Transduction; (D)-Protein
  • (A)-Translation; (B)-Replication; (C)-Transcription; (D)-Transduction
  • (A)-Replication; (B)-Transcription; (C)-Translation; (D)-Protein
  • (A)-Transduction; (B)-Translation; (C)-Replication; (D)-Protein
  • Correct Option: C  [ (A)-Replication; (B)-Transcription; (C)-Translation; (D)-Protein ]

    Remark:

The factor that leads to Founder effect in a population is:

[class-xii ]

  • Natural selection
  • Genetic recombination
  • Mutation
  • Genetic drift
  • Correct Option: D  [ Genetic drift ]

    Remark:

Mutations in plant cells can be induced by:

[class-xii ]

  • Kinetin
  • Infrared rays
  • Gamma rays
  • Zeatin
  • Correct Option: C  [ Gamma rays ]

    Remark:

Match List-I with List-II.

List-I List-II
(A)Protoplast fusion (I)Totipotency
(B)Plant tissue culture (II)Pomato
(C)Meristem culture (III)Somaclones
(D)Micropropagation (IV)Virus free plants
Choose the correct answer from the options given below:

[class-xii ]

  • A-II, B-I, C-IV, D-III
  • A-III, B-IV, C-I, D-II
  • A-IV, B-III, C-II, D-I
  • A-III, B-IV, C-II, D-I
  • Correct Option: A  [ A-II, B-I, C-IV, D-III ]

    Remark:

During the purification process for recombinant DNA technology, addition of chilled ethanol precipitates out:

[class-xii ]

  • RNA
  • DNA
  • Histones
  • Polysaccharides
  • Correct Option: B  [ DNA ]

    Remark:

DNA strands on a gel stained with ethidium bromide when viewed under UV radiation, appear as:

[class-xii ]

  • Yellow bands
  • Bright orange bands
  • Dark red bands
  • Bright blue bands
  • Correct Option: B  [ Bright orange bands ]

    Remark:

When gene targetting involving gene amplification is attempted in an individual's tissue to treat disease, it is known as:

[class-xii ]

  • Biopiracy
  • Gene therapy
  • Molecular diagnosis
  • Safety testing
  • Correct Option: B  [ Gene therapy ]

    Remark:

Which of the following is not an application of PCR (Polymerase Chain Reaction)?

[class-xii ]

  • Molecular diagnosis
  • Gene amplification
  • Purification of isolated protein
  • Detection of gene mutation
  • Correct Option: C  [ Purification of isolated protein ]

    Remark:

Which of the following is a correct sequence of steps in a PCR (Polymerase Chain Reaction)?

[class-xii ]

  • Denaturation, Annealing, Extension
  • Denaturation, Extension, Annealing
  • Extension, Denaturation, Annealing
  • Annealing, Denaturation, Extension
  • Correct Option: A  [ Denaturation, Annealing, Extension ]

    Remark: