Class 12 Biology DPP — Ch 5 — Molecular Basis of Inheritance | 7 August 2026

Assertion (A): The genetic code is universal.
Reason (R): The same codon codes for the same amino acid in almost all organisms.

Choose the correct option:

A. Both A and R are true, and R is the correct explanation of A B. Both A and R are true, but R is NOT the correct explanation of A C. A is true, but R is false D. A is false, but R is true

📝 SolutionThe genetic code is (nearly) universal because a given codon specifies the same amino acid across most organisms. R correctly explains A.

DNA replication is described as semi-conservative, meaning each new DNA has:

A. two new strands B. one old and one new strand C. two old strands D. no strand

📝 SolutionIn semi-conservative replication, each daughter DNA molecule has one original (old) strand and one newly synthesised strand.

The enzyme that joins nucleotides during DNA replication is:

A. DNA polymerase B. amylase C. lipase D. pepsin

📝 SolutionDNA polymerase adds nucleotides to the growing strand during replication.

The full form of RNA is:

A. Ribonucleic Acid B. Renal Nucleic Acid C. Ribose Neutral Acid D. Reduced Nitric Acid

📝 SolutionRNA stands for Ribonucleic Acid, a nucleic acid involved in protein synthesis.

The molecule that carries amino acids to the ribosome during translation is:

A. mRNA B. tRNA C. rRNA D. DNA

📝 SolutionTransfer RNA (tRNA) carries specific amino acids to the ribosome and matches them to codons on the mRNA.

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Class 12 · Biology

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