NEET Botany Molecular Basis of Inheritance Questions Solved

Choose the correct statements:
I. Binding of mRNA to the ribosome is loose and reversible.
II. The ribosome, which is composed of tRNA and proteins, consists of a small and large subunit.
III. Each of the 20 amino acids has a minimum of one specific tRNA molecule.
IV. tRNAMET binds to the first codon (AUG) - this is called the START codon.
V. The second tRNA binds to the second codon so that their attached monosaccharides are next to each other
VI. The newly formed polypeptide may undergo post-transcriptional modification.
(a) I, III and IV         (b) II, IV, VI               (c) II, V and VI           (d) I, V, VI

All the statements are correct except:-
II. The ribosome consists of structural RNAs and 80 different proteins.In its inactive state, it exists as two subunits; a large subunit and a small subunit.
V. Complexes composed of an amino acid linked to tRNA bind to the appropriate codon in mRNA by forming complementary base pairs with the tRNA anticodon. The ribosome moves from codon to codon along the mRNA. Amino acids are added one by one, translated into Polypeptide sequences.
VI. The newly formed polypeptide undergoes post-translational modifications.

Difficulty Level:

  • 39%
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