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  4. Molecular Basis of Inheritance Chapter-Wise Test 2

Molecular Basis of Inheritance Chapter-Wise Test 2

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following is incorrect about RNA processing in eukaryotes?

A 5' cap is added to mRNA.
Introns are removed during splicing.
Poly-A tail is added at the 5' end of mRNA.
RNA processing occurs in the nucleus.
3

The poly-A tail is added to the 3' end of mRNA, not the 5' end.

Which molecule serves as an adapter in protein synthesis by linking codons to amino acids?

mRNA
rRNA
tRNA
snRNA
3

tRNA acts as an adapter molecule by linking codons in mRNA to the corresponding amino acids during translation.

Which of the following is correct about a repressible operon?

It is always active, regardless of environmental conditions.
It is normally on but can be turned off by a repressor.
It is permanently inactive.
It requires an inducer for activation.
2

A repressible operon, such as the trp operon, is normally on but can be turned off when a repressor binds to it.

Which term describes the process of RNA being converted into protein?

Replication
Transcription
Translation
Splicing
3

Translation is the process in which ribosomes synthesize proteins using mRNA as a template.

Which of the following is true regarding post-transcriptional modifications in eukaryotes?

They occur in the cytoplasm
They include intron removal and exon splicing
They involve DNA polymerase
They do not affect gene expression
2

Post-transcriptional modifications in eukaryotes involve intron removal, exon splicing, 5' capping, and polyadenylation.

What is the primary function of histone proteins in eukaryotic cells?

To catalyze transcription
To package DNA into chromatin
To synthesize ribosomes
To transport RNA
2

Histone proteins help in the packaging of DNA into chromatin by forming nucleosomes.

Which of the following statements about enhancers is correct?

Enhancers prevent transcription.
Enhancers are DNA sequences that increase transcription efficiency.
Enhancers act only at the promoter site.
Enhancers function only in prokaryotic cells.
2

Enhancers are DNA sequences that increase transcription efficiency by binding to activator proteins.

Which of the following best describes a polycistronic mRNA?

It codes for only one protein
It contains multiple genes that are translated separately
It is found in eukaryotic cells
It contains only exons
2

Polycistronic mRNA contains multiple genes, typically found in prokaryotes, which are translated into different proteins.

Which type of RNA has an anticodon region?

mRNA
tRNA
rRNA
snRNA
2

tRNA has an anticodon region that pairs with the codon in mRNA during translation.

Which component of an operon serves as the binding site for RNA polymerase?

Operator
Promoter
Regulator
Structural gene
2

The promoter is the site where RNA polymerase binds to initiate transcription in an operon.

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