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NEET Biology 2023 PYQs
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100 questions in NEET 2023
In angiosperm, the haploid, diploid and triploid structures of a fertilized embryo sac sequentially are:
A
Synergids, antipodals and Polar nuclei
B
Synergids, Primary endosperm nucleus and zygote
C
Antipodals, synergids, and primary endosperm nucleus
D
Synergids, Zygote and Primary endosperm nucleus
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What is the function of tassels in the corn cob?
A
To protect seeds
B
To attract insects
C
To trap pollen grains
D
To disperse pollen grains
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The phenomenon of pleiotropism refers to:
A
more than two genes affecting a single character.
B
presence of several alleles of a single gene controlling a single crossover
C
presence of two alleles, each of the two genes controlling a single trait
D
a single gene affecting multiple phenotypic expression.
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Frequency of recombination between gene pairs on same chromosome as a measure of the distance between genes to map their position on chromosome, was used for the first time by:
A
Henking
B
Thomas Hunt Morgan
C
Sutton and Boveri
D
Alfred Sturtevant
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What is the role of RNA polymerase III in the process of transcription in Eukaryotes?
A
Transcription of only snRNAS
B
Transcription of rRNAs (28S, 18S and 5.8S)
C
Transcription of tRNA, 5 srRNA and snRNA
D
Transcription of precursor of mRNA
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Expressed Sequence Tags (ESTs) refers to:
A
Certain important expressed genes.
B
All genes that are expressed as RNA.
C
All genes that are expressed as proteins
D
All genes whether expressed or unexpressed.
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Unequivocal proof that DNA is the genetic material was first proposed by:
A
Wilkins and Franklin
B
Fedrick, Griffith
C
Alfred Hershey and Martha Chase
D
Avery, Macleoid and McCarthy
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Upon exposure to UV radiation, DNA stained with ethidium bromide will show:
A
Bright orange colour
B
Bright red colour
C
Bright blue colour
D
Bright yellow colour
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In gene gun method used to introduce alien DNA into host cells, microparticles of ______ metal are used.
A
Silver
B
Copper
C
Zinc
D
Tungsten or gold
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During the purification process for recombinant DNA
technology, addition of chilled ethanol precipitates out:
A
Polysaccharides
B
RNA
C
DNA
D
Histones
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