In angiosperm, the haploid, diploid and triploid structures of a fertilized embryo sac sequentially are:

NEET-2023 Sexual-Reproduction-in-Flowering-Plants [class-xii ]

• Synergids, antipodals and Polar nuclei
• Synergids, Primary endosperm nucleus and zygote
• Antipodals, synergids, and primary endosperm nucleus
• Synergids, Zygote and Primary endosperm nucleus
Correct Option: D  [ Synergids, Zygote and Primary endosperm nucleus ]

Remark:

What is the function of tassels in the corn cob?

NEET-2023 Sexual-Reproduction-in-Flowering-Plants [class-xii ]

• To protect seeds
• To attract insects
• To trap pollen grains
• To disperse pollen grains
Correct Option: C  [ To trap pollen grains ]

Remark:

The phenomenon of pleiotropism refers to:

NEET-2023 Principles-of-Inheritance-and-Variation [class-xii ]

• more than two genes affecting a single character.
• presence of several alleles of a single gene controlling a single crossover
• presence of two alleles, each of the two genes controlling a single trait
• a single gene affecting multiple phenotypic expression.
Correct Option: D  [ a single gene affecting multiple phenotypic expression. ]

Remark:

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:

NEET-2023 Principles-of-Inheritance-and-Variation [class-xii ]

• Henking
• Thomas Hunt Morgan
• Sutton and Boveri
• Alfred Sturtevant
Correct Option: D  [ Alfred Sturtevant ]

Remark:

What is the role of RNA polymerase III in the process of transcription in Eukaryotes?

NEET-2023 Molecular-Basis-of-Inheritance [class-xii ]

• Transcription of only snRNAS
• Transcription of rRNAs (28S, 18S and 5.8S)
• Transcription of tRNA, 5 srRNA and snRNA
• Transcription of precursor of mRNA
Correct Option: C  [ Transcription of tRNA, 5 srRNA and snRNA ]

Remark:

Expressed Sequence Tags (ESTs) refers to:

NEET-2023 Molecular-Basis-of-Inheritance [class-xii ]

• Certain important expressed genes.
• All genes that are expressed as RNA.
• All genes that are expressed as proteins
• All genes whether expressed or unexpressed.
Correct Option: B  [ All genes that are expressed as RNA. ]

Remark:

Unequivocal proof that DNA is the genetic material was first proposed by:

NEET-2023 Molecular-Basis-of-Inheritance [class-xii ]

• Wilkins and Franklin
• Fedrick, Griffith
• Alfred Hershey and Martha Chase
• Avery, Macleoid and McCarthy
Correct Option: C  [ Alfred Hershey and Martha Chase ]

Remark:

Upon exposure to UV radiation, DNA stained with ethidium bromide will show:

NEET-2023 Biotechnology-Principles-and-Processes [class-xii ]

• Bright orange colour
• Bright red colour
• Bright blue colour
• Bright yellow colour
Correct Option: A  [ Bright orange colour ]

Remark:

In gene gun method used to introduce alien DNA into host cells, microparticles of ______ metal are used.

NEET-2023 Biotechnology-Principles-and-Processes [class-xii ]

• Silver
• Copper
• Zinc
• Tungsten or gold
Correct Option: D  [ Tungsten or gold ]

Remark:

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

NEET-2023 Biotechnology-Principles-and-Processes [class-xii ]

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

Remark: