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Science (English Medium) Class 12 - CBSE Important Questions for Biology

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What do 'Y' and 'B' stand for in 'YAC' and 'BAC' used in Human Genome Project (HGP).

Mention their role in the project.

Appears in 1 question paper
Chapter: [5] Molecular Basis of Inheritance
Concept: Human Genome Project

Describe the process of transcription in bacteria

Appears in 1 question paper
Chapter: [5] Molecular Basis of Inheritance
Concept: Protein Synthesis >> Transcription

How do m-RNA, t-RNA and ribosomes help in the process of translation?

Appears in 1 question paper
Chapter: [5] Molecular Basis of Inheritance
Concept: Protein Synthesis >> Transcription

Explain the process of transcription in prokaryotes.

Appears in 1 question paper
Chapter: [5] Molecular Basis of Inheritance
Concept: Protein Synthesis >> Transcription

Name the enzyme and state its property that is responsible for continuous and discontinuous replication of the two strands of a DNA molecule

Appears in 1 question paper
Chapter: [5] Molecular Basis of Inheritance
Concept: Deoxyribonucleic Acid (DNA)

It is established that RNA is the first genetic material. Explain giving three reasons.

Appears in 1 question paper
Chapter: [5] Molecular Basis of Inheritance
Concept: Properties of Genetic Material

Name the enzyme responsible for the transcription of tRNA and the amino acid the initiator tRNA gets linked with.

Appears in 1 question paper
Chapter: [5] Molecular Basis of Inheritance
Concept: Protein Synthesis >> Transcription

State the aim and describe Messelson and Stahl’s experiment.

Appears in 1 question paper
Chapter: [5] Molecular Basis of Inheritance
Concept: Protein Synthesis >> Transcription

How are the following formed and involved in DNA packaging in a nucleus of a cell?

(i) Histone octomer
(ii) Nucleosome
(iii) Chromatin
Appears in 1 question paper
Chapter: [5] Molecular Basis of Inheritance
Concept: Packaging of DNA Helix

Differentiate between Euchromatin and Heterochromatin.

Appears in 1 question paper
Chapter: [5] Molecular Basis of Inheritance
Concept: Packaging of DNA Helix

List the criteria a molecule that can act as genetic material must fulfill. Which one of the criteria are best fulfilled by DNA or by RNA thus making one of them a better genetic material than the other? Explain.

Appears in 1 question paper
Chapter: [5] Molecular Basis of Inheritance
Concept: Properties of Genetic Material

Give an example of a codon having dual function.

Appears in 1 question paper
Chapter: [5] Molecular Basis of Inheritance
Concept: Genetic Code

State the difference between the structural genes in a Transcription Unit of Prokaryotes and Eukaryotes.

Appears in 1 question paper
Chapter: [5] Molecular Basis of Inheritance
Concept: Protein Synthesis >> Transcription Unit and the Gene

List two essential roles of ribosomes during translation.

Appears in 1 question paper
Chapter: [5] Molecular Basis of Inheritance
Concept: Protein Synthesis >> Translation

How is Prokaryotic Transcription process different in eukaryotes?

Appears in 1 question paper
Chapter: [5] Molecular Basis of Inheritance
Concept: Protein Synthesis >> Transcription

Explain the processing the hnRNA needs to undergo before becoming functional mRNA eukaryotes.

Appears in 1 question paper
Chapter: [5] Molecular Basis of Inheritance
Concept: Protein Synthesis >> Transcription

Explain the role of initiator tRNA in the initiation of protein synthesis.

Appears in 1 question paper
Chapter: [5] Molecular Basis of Inheritance
Concept: Protein Synthesis >> Transcription

Write the percentage of the total human genome that codes for proteins and the percentage of discovered genes whose functions are known as observed during HGP.

Appears in 1 question paper
Chapter: [5] Molecular Basis of Inheritance
Concept: Human Genome Project

Expand 'SNPs' identified by scientists in HGP

Appears in 1 question paper
Chapter: [5] Molecular Basis of Inheritance
Concept: Human Genome Project

How does a degenerate code differ from an unambiguous one?

Appears in 1 question paper
Chapter: [5] Molecular Basis of Inheritance
Concept: Genetic Code >> tRNA – the Adapter Molecule
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