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NEET - September 2020 Previous Year Questions



NEET Biology Previous Year Questions - September 2020

Meiotic division of the secondary oocyte is completed:

NEET-(Sept)2020 [Human-Reproduction] [class-xii ]

  • Prior to ovulation
  • At the time of copulation
  • After zygote formation
  • At the time of fusion of a sperm with an ovum
  • Correct Option: D  [ At the time of fusion of a sperm with an ovum ]

    Remark:

Select the option including all sexually transmitted diseases.

NEET-(Sept)2020 [Reproductive-Health] [class-xii ]

  • Gonorrhoea, Syphilis, Genital herpes
  • Gonorrhoea, Malaria, Genital herpes
  • AIDS, Malaria, Filaria
  • Cancer, AIDS, Syphilis
  • Correct Option: A  [ Gonorrhoea, Syphilis, Genital herpes ]

    Remark:

In which of the following techniques, the embryos are transferred to assist those females who cannot conceive?

NEET-(Sept)2020 [Reproductive-Health] [class-xii ]

  • ZIFT and IUT
  • GIFT and ZIFT
  • ICSI and ZIFT
  • GIFT and ICSI
  • Correct Option: A  [ ZIFT and IUT ]

    Remark:

How many true breeding pea plant varieties did Mendel select as pairs, which were similar except in one character with contrasting traits?

NEET-(Sept)2020 [Principles-of-Inheritance-and-Variation] [class-xii ]

  • 4
  • 2
  • 14
  • 8
  • Correct Option: C  [ 14 ]

    Remark:

Identify the wrong statement with reference to the gene 'I' that controls ABO blood groups.

NEET-(Sept)2020 [Principles-of-Inheritance-and-Variation] [class-xii ]

  • The gene (I) has three alleles.
  • A person will have only two of the three alleles.
  • When IA and IB are present together, they express same type of sugar.
  • Allele 'i' does not produce any sugar.
  • Correct Option: C  [ When IA and IB are present together, they express same type of sugar. ]

    Remark:

Experimental verification of the chromosomal theory of inheritance was done by:

NEET-(Sept)2020 [Principles-of-Inheritance-and-Variation] [class-xii ]

  • Mendel
  • Sutton
  • Boveri
  • Morgan
  • Correct Option: D  [ Morgan ]

    Remark:

Select the correct match.

NEET-(Sept)2020 [Principles-of-Inheritance-and-Variation] [class-xii ]

  • Haemophilia - Y linked
  • Phenylketonuria - Autosomal dominant trait
  • Sickle cell anaemia - Autosomal recessive trait, chromosome-11
  • Thalassemia - X linked
  • Correct Option: C  [
    Sickle cell anaemia - Autosomal recessive trait, chromosome-11
    ]

    Remark:

Name the enzyme that facilitates opening of DNA helix during transcription.

NEET-(Sept)2020 [Molecular-Basis-of-Inheritance] [class-xii ]

  • DNA ligase
  • DNA helicase
  • DNA polymerase
  • RNA polymerase
  • Correct Option: D  [ RNA polymerase ]

    Remark:

Which of the following statements is correct?

NEET-(Sept)2020 [Molecular-Basis-of-Inheritance] [class-xii ]

  • Adenine pairs with thymine through two H-bonds.
  • Adenine pairs with thymine through one H-bond.
  • Adenine pairs with thymine through three H-bonds.
  • Adenine does not pair with thymine.
  • Correct Option: A  [ Adenine pairs with thymine through two H-bonds. ]

    Remark:

If the distance between two consecutive base pairs is 0.34 nm and the total number of base pairs of a DNA double helix in a typical mammalian cell is 6.6×109 bp, then the length of the DNA is approximately:

NEET-(Sept)2020 [Molecular-Basis-of-Inheritance] [class-xii ]

  • 2.0 meters
  • 2.5 meters
  • 2.2 meters
  • 2.7 meters
  • Correct Option: C  [ 2.2 meters ]

    Remark: