Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

51.

Study the pedigree chart of a certain family given below and select the correct conclusion which can be drawn for the character.

  • The female parent is heterozygous

  • The parents could not have a had a normal daughter for this character

  • The trait under study could not be colour blindness

  • The trait under study could not be colour blindness


A.

The female parent is heterozygous

The given pedigree chart shows that both the daughters received the gene from the parents, while son may be normal or affected. It shows that the female parent is heterozygous.

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52.

The lac operon consists of 

  • four regulatory genes only

  • one regulatory gene and three structural genes

  • two regulatory genes and two structural genes

  • two regulatory genes and two structural genes


B.

one regulatory gene and three structural genes

Lac operon is the operon that regulates lactose metabolism in the bacterium Escherichia coli. Its form wast first postulated in 1961 by Francois Jacob and Jacques Monod to explain the control of β- galactosidase synthesis and for this work, they were awarded Nobel Prize. Lac operon system or inducible operon system consists of regulator gene (i) promoter gene (z, y and a), repressor protein and inducer.
Drosophila

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53.

Study the cycle shown below and select the option which gives correct words for all the four blanks A, B, C and D.

  • A

    B

    C

    D

    Nitrification

    Ammonification

    Animals

    plants

  • A

    B

    C

    D

    Dentirificiation

    Ammonification

    Plants

    Animals

  • A

    B

    C

    D

    Nitrification

    Denitrification

    Animals

    Plants

  • A

    B

    C

    D

    Nitrification

    Denitrification

    Animals

    Plants


B.

A

B

C

D

Dentirificiation

Ammonification

Plants

Animals

A- Denitrification

B-Ammonification

C- Plants

D-Animals

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54.

Given below is the diagram of a bacteriophage in which one of the options, all the four parts A, B, C and D are correct?


  • A

    B

    C

    D

    Tail fibres

    Head

    Sheath

    Collar

  • A

    B

    C

    D

    Sheath

    Collar

    Head

    Tail fibres

  • A

    B

    C

    D

    Head

    Collar

    Sheath

    Tail fibres

  • A

    B

    C

    D

    Head

    Collar

    Sheath

    Tail fibres


C.

A

B

C

D

Head

Collar

Sheath

Tail fibres

Plasmids are the extrachromosomal DNA found in bacterial cells. These are commonly used as vectors in genetic engineering programmes because these have the capacity of binding with eukaryotic DNA.
A bacteriophage is a virus that is parasitic within a bacterium. These also, are the important tools in genetic engineering s cloning vectors.

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