Genetic code was deciphered by _______ who argued it should be a triplet.

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

• Watson
• Crick
• George Gamow
• Khorana
Correct Option: C  [ George Gamow ]

Remark: Physicist George Gamow proposed the triplet code.

Three codons UAA, UAG, and UGA function as _______ codons.

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

• Start
• Stop
• Sense
• Ambiguous
Correct Option: B  [ Stop ]

Remark: They are the stop/termination codons.

The codon AUG codes for _______ and also acts as initiator codon.

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

• Valine
• Methionine
• Proline
• Leucine
Correct Option: B  [ Methionine ]

Remark: AUG codes for Methionine.

Since there are 64 codons for 20 amino acids, the code is _______

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

• Universal
• Specific
• Degenerate
• Unambiguous
Correct Option: C  [ Degenerate ]

Remark: Degeneracy means multiple codons code for one amino acid.

Insertion or deletion of one or two bases results in _______ mutation.

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

• Point
• Frameshift
• Silent
• Neutral
Correct Option: B  [ Frameshift ]

Remark: Indels of 1-2 bases shift the reading frame.

tRNA was formerly called _______ RNA.

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

• Messenger
• Ribosomal
• Soluble
• Transfer
Correct Option: C  [ Soluble ]

Remark: tRNA was known as sRNA (soluble RNA).

tRNA has an _______ loop that has bases complementary to the code.

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

• Acceptor
• Anticodon
• D-loop
• T-loop
Correct Option: B  [ Anticodon ]

Remark: The anticodon loop binds to the mRNA codon.

The secondary structure of tRNA looks like a _______

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

• Helix
• Clover-leaf
• L-shape
• Sphere
Correct Option: B  [ Clover-leaf ]

Remark: The 2D structure is a clover-leaf.

The actual 3D structure of tRNA looks like an inverted _______

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

• T
• L
• Y
• U
Correct Option: B  [ L ]

Remark: The 3D structure resembles an inverted L.

Translation refers to the process of polymerization of _______ to form a polypeptide.

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

• Nucleotides
• Sugars
• Amino acids
• Fatty acids
Correct Option: C  [ Amino acids ]

Remark: Translation creates a polypeptide chain from amino acids.