Molecular Basis of Inheritance Chapter-Wise Test 15

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following molecules carries amino acids to the ribosome during translation?

mRNA
tRNA
rRNA
snRNA
2

tRNA (transfer RNA) carries amino acids to the ribosome for protein synthesis during translation.

Which of the following is incorrect about histones?

Histones help in DNA packaging.
Histones are positively charged proteins.
Histones are found in both prokaryotic and eukaryotic cells.
Histones form nucleosomes by wrapping DNA.
3

Histones are only found in eukaryotic cells, as prokaryotic DNA lacks histones.

Which of the following statements about transcription factors is correct?

They enhance the activity of DNA polymerase
They help regulate gene expression
They are involved in translation
They only bind to exons
2

Transcription factors regulate gene expression by binding to specific DNA sequences and influencing transcription.

What is the role of sigma (σ) factor in bacterial transcription?

Termination of transcription
Binding of RNA polymerase to the promoter
Ribosome assembly
Splicing of pre-mRNA
2

The sigma (σ) factor helps RNA polymerase recognize and bind to the promoter during transcription initiation in bacteria.

Which of the following statements about enhancers is correct?

Enhancers decrease transcription efficiency.
Enhancers function only in prokaryotes.
Enhancers increase transcription efficiency.
Enhancers act as the binding site for ribosomes.
3

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

Which type of RNA forms the major structural and catalytic component of ribosomes?

mRNA
tRNA
rRNA
snRNA
3

rRNA (ribosomal RNA) is the structural and catalytic component of ribosomes, aiding in protein synthesis.

What is the function of chaperone proteins?

To assist in protein folding
To facilitate DNA replication
To degrade misfolded proteins
To regulate transcription
1

Chaperone proteins assist in the proper folding of newly synthesized proteins to ensure their functional conformation.

Which of the following statements about rRNA is correct?

rRNA carries amino acids to the ribosome.
rRNA functions as a catalytic molecule in translation.
rRNA contains codons that specify amino acids.
rRNA is directly translated into proteins.
2

rRNA (ribosomal RNA) functions as a catalytic molecule in translation, aiding in peptide bond formation.

What is the function of the poly-A tail in eukaryotic mRNA?

It helps in ribosome binding
It protects mRNA from degradation
It plays a role in DNA replication
It assists in protein folding
2

The poly-A tail protects eukaryotic mRNA from degradation and aids in translation.

Which scientist proposed the one gene-one enzyme hypothesis?

Watson and Crick
Beadle and Tatum
Frederick Griffith
Hershey and Chase
2

Beadle and Tatum proposed the one gene-one enzyme hypothesis through experiments with Neurospora crassa.

Performance Summary

Score:

Category Details
Total Attempts:
Total Skipped:
Total Wrong Answers:
Total Correct Answers:
Time Taken:
Average Time Taken per Question:
Accuracy:
0