Molecular Basis of Inheritance Chapter-Wise Test 18

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which feature of DNA allows its replication to be described as "semi-conservative"?

Each new DNA molecule contains two newly synthesized strands
Each new DNA molecule consists of one parental and one newly synthesized strand
Both parental strands remain intact
DNA replication occurs in only one direction
2

DNA replication is semi-conservative because each new molecule contains one parental and one new strand.

Which type of RNA carries genetic information from DNA to the ribosome?

tRNA
rRNA
mRNA
snRNA
3

mRNA (messenger RNA) carries genetic information from DNA to the ribosome for protein synthesis.

Which of the following best describes the function of a promoter?

It binds to tRNA during translation.
It prevents gene expression.
It is the binding site for RNA polymerase.
It marks the end of transcription.
3

A promoter is a DNA sequence where RNA polymerase binds to initiate transcription.

Which of the following codons serves as the start codon in most organisms?

UAA
AUG
UGA
UAG
2

AUG is the start codon, coding for methionine, and serves as the initiation signal for translation.

Which scientist discovered the phenomenon of transformation in bacteria?

Oswald Avery
Frederick Griffith
Hershey and Chase
Meselson and Stahl
2

Frederick Griffith discovered the phenomenon of transformation while working with Streptococcus pneumoniae.

Which of the following mutations does NOT alter the amino acid sequence of a protein?

Missense mutation
Nonsense mutation
Silent mutation
Frameshift mutation
3

A silent mutation changes a nucleotide sequence but does not alter the amino acid due to the degeneracy of the genetic code.

Which enzyme is required for cDNA synthesis from mRNA?

RNA polymerase
Reverse transcriptase
DNA polymerase
Ligase
2

Reverse transcriptase synthesizes complementary DNA (cDNA) from an mRNA template.

Which of the following best describes the function of the Human Genome Project (HGP)?

To identify and sequence all human genes
To find a cure for genetic diseases
To increase human intelligence
To modify human genetic material
1

The Human Genome Project aimed to identify all human genes and determine the complete DNA sequence of the human genome.

Which of the following modifications occurs at the 5' end of eukaryotic mRNA?

Polyadenylation
Splicing
Capping
Methylation of cytosine
3

In eukaryotes, a 5' cap (methyl guanosine triphosphate) is added to mRNA to enhance stability and translation efficiency.

Which enzyme is responsible for unwinding the DNA double helix during replication?

Ligase
Helicase
Topoisomerase
RNA polymerase
2

Helicase unwinds the DNA double helix, allowing replication to proceed.

Performance Summary

Score:

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