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NCERT Class 12 Biology Chapters
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1.
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Central dogma in molecular biology states that genetic information flows from:
(a) DNA → DNA → Lipid (b) DNA → mRNA → Protein
(c) Protein → mRNA → DNA (d) DNA → Protein → mRNA
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2.
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Identify the flow of information according to the ‘Central Dogma’ of Molecular biology:
(a) mRNA → Protein → DNA (b) mRNA → tRNA → RNA
(c) DNA → mRNA → Protein (d) Protein → mRNA → DNA
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3.
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Adenine pairs with Thymine through how many hydrogens bonds?
(a) 2 (b) 3 (c) 4 (d) 5
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4.
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Identify the statements true for RNA.
(A) RNA acts as a genetic material for some viruses.
(B) RNA also functions as an adapter molecule.
(C) RNA has hexose sugar as its backbone.
(D) RNA also acts as catalyst in some cases.
Choose the correct answer from the options given below:
(a) (A), (B) and (C) only (b) (A), (B) and (D) only
(c) (B), (C) and (D) only (d) (A), (C) and (D) only
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5.
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Arrange the following steps of experiments performed by Griffith in correct series.
(A) 'S' strain → injected into mice → Mice died
(B) 'S' strain (Heat killed) → injected into mice → Mice lived
(C) 'R' strain → injected into mice → Mice lived
(D) 'S' strain (Heat killed) + 'R' Strain (Live) → injected into mice → Mice died
Choose the correct answer from the options given below:
(a) (A), (B), (C), (D) (b) (B), (A), (C), (D) (c) (B), (C), (D), (A) (d) (A), (C), (B), (D)
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1.
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A segment of DNA molecule comprises of 546 nucleotides. How many cytosine nucleotides would be present in it if the number of adenine nucleotides is 96?
(CBSE 2019, 2M)
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2.
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The length of DNA in any cell is far greater than the dimension of its nucleus. Explain how this enormous DNA is packaged in a eukaryotic cell.
(CBSE 2023, 3M)
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3.
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Explain the discovery made by Hershey and Chase using radioactive sulphur and phosphorus in their experiment.
(CBSE 2020, 3M)
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4.
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Hershey and Chase carried out their experiment under three steps :
(a) Infection, (b) Blending, and (c) Centrifugation.
Explain each one of these steps that helped them to prove that DNA is the hereditary material.
(CBSE 2019, 3M)
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5.
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Describe the experiment carried out by Hershey and Chase. Write the conclusion they arrived at.
(CBSE 2020, 5M)
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Chapter Name
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Sub Topics
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Molecular Basis of Inheritance
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5.1 Introduction
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5.2 Structure of DNA and RNA
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5.3 Replication of DNA
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5.4 Transcription and its Regulation
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5.5 Translation and its Mechanism
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5.6 Genetic Code
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5.7 Mutations
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5.8 Gene Expression and Regulation
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