Termination of translation occurs when a _______ codon reaches the A site.

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

• Start
• Sense
• Stop
• AUG
Correct Option: C  [ Stop ]

Remark: Stop codons signal termination.

The human genome has approximately _______ billion base pairs.

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

• 1
• 2
• 3
• 4
Correct Option: C  [ 3 ]

Remark: Approximately 3 billion (3.3 x 10^9).

Sickle cell anemia is caused by a _______ mutation.

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

• Frameshift
• Point
• Chromosomal
• Genomic
Correct Option: B  [ Point ]

Remark: It is a point mutation (substitution).

Taylor used Vicia faba to prove that DNA replication is _______

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

• Conservative
• Semi-conservative
• Dispersive
• Non-conservative
Correct Option: B  [ Semi-conservative ]

Remark: Taylor proved semi-conservative replication in eukaryotes.

DNA replication is _______ and semi-discontinuous.

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

• Conservative
• Semi-conservative
• Continuous
• Dispersive
Correct Option: B  [ Semi-conservative ]

Remark: It is semi-conservative.

The enzyme _______ separates the two strands of DNA during replication.

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

• Ligase
• Primase
• Helicase
• Polymerase
Correct Option: C  [ Helicase ]

Remark: Helicase unwinds the DNA.

To prevent re-annealing of separated DNA strands, _______ proteins bind to them.

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

• Histone
• SSB
• Repressor
• Operator
Correct Option: B  [ SSB ]

Remark: Single Stranded Binding proteins stabilize the strands.

_______ is the enzyme that synthesizes RNA primer.

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

• DNA Polymerase
• RNA Polymerase
• Primase
• Ligase
Correct Option: C  [ Primase ]

Remark: Primase synthesizes the RNA primer.

DNA polymerase adds nucleotides to the _______ end of the growing chain.

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

• 5'
• 3'
• Both
• None
Correct Option: B  [ 3' ]

Remark: Nucleotides are added to the 3' OH end.

Okazaki fragments are formed on the _______ strand.

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

• Leading
• Lagging
• Template
• Coding
Correct Option: B  [ Lagging ]

Remark: Okazaki fragments form on the lagging strand.