Molecular Basis of Inheritance Chapter-Wise Test 12

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following enzymes is responsible for synthesizing rRNA in eukaryotes?

RNA polymerase I
RNA polymerase II
RNA polymerase III
DNA polymerase
1

RNA polymerase I synthesizes ribosomal RNA (rRNA) in eukaryotic cells.

Which of the following statements about DNA fingerprinting is correct?

It relies on variations in protein sequences
It analyzes repetitive DNA sequences
It is identical in all humans
It does not require DNA polymerase
2

DNA fingerprinting analyzes variations in repetitive DNA sequences, such as VNTRs, to identify individuals.

Which of the following statements about transcription is correct?

RNA polymerase requires a primer to initiate transcription.
Transcription occurs in the nucleus in eukaryotic cells.
Both DNA strands act as templates simultaneously.
Transcription produces proteins directly.
2

In eukaryotes, transcription occurs in the nucleus, while in prokaryotes, it occurs in the cytoplasm.

Which of the following is a post-transcriptional modification in eukaryotes?

RNA splicing
DNA replication
Protein folding
Translation
1

RNA splicing is a post-transcriptional modification that removes introns from pre-mRNA in eukaryotes.

Which of the following best describes the function of the TATA box?

It terminates transcription
It binds RNA polymerase for transcription initiation
It enhances translation
It signals splicing sites
2

The TATA box is a promoter sequence that binds transcription factors and RNA polymerase to initiate transcription.

Which of the following statements about the genetic code is incorrect?

The genetic code is triplet in nature.
Each codon codes for multiple amino acids.
The genetic code is universal.
The genetic code is non-overlapping.
2

Each codon codes for only one specific amino acid, not multiple amino acids.

What is the main function of a nucleosome in eukaryotic cells?

To regulate gene expression
To store genetic material
To package DNA into a compact structure
To synthesize proteins
3

A nucleosome helps package DNA into a compact structure by wrapping it around histone proteins.

Which scientist(s) confirmed that DNA is the genetic material through experiments with bacteriophages?

Hershey and Chase
Watson and Crick
Avery, MacLeod, and McCarty
Rosalind Franklin
1

Hershey and Chase used bacteriophage experiments to confirm that DNA, not protein, is the genetic material.

What is the role of topoisomerase in DNA replication?

Unwinds the DNA helix
Prevents overwinding of DNA ahead of the replication fork
Synthesizes RNA primer
Joins Okazaki fragments
2

Topoisomerase prevents the overwinding of DNA ahead of the replication fork by relieving torsional strain.

Which of the following statements about the lac operon is correct?

The lac operon is normally active in the absence of lactose.
The lac operon is regulated by a repressor protein.
The lac operon does not require a promoter sequence.
Lactose acts as a repressor in the lac operon.
2

The lac operon is regulated by a repressor protein, which prevents transcription in the absence of lactose.

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