Biology

Molecular Genetics

917 Questions

Molecular genetics explores the mechanisms of genetic information transfer, including DNA replication, transcription, and translation. It is a core component of biology syllabi. These concepts frequently appear in general science sections of major competitive exams.

DNA replicationTranscription processTranslation processRNA typesCentral dogma

Molecular Genetics Questions

Multiple choice

What is the role of mRNA in translation?

  1. It carries the genetic information from DNA to the ribosome

  2. It helps RNA polymerase bind to the DNA

  3. It terminates translation

  4. It provides the template for RNA synthesis
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

mRNA molecules carry the genetic information from DNA to the ribosome during translation.

Multiple choice

What is the role of the ribosome in translation?

  1. It assembles amino acids into a protein

  2. It helps RNA polymerase bind to the DNA

  3. It terminates translation

  4. It provides the template for RNA synthesis
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Ribosomes assemble amino acids into a protein during translation.

Multiple choice

What is the role of the stop codon in translation?

  1. It signals the end of translation

  2. It helps RNA polymerase bind to the DNA

  3. It terminates transcription

  4. It provides the template for RNA synthesis
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The stop codon signals the end of translation.

Multiple choice

What is the role of the release factor in translation?

  1. It releases the newly synthesized protein from the ribosome

  2. It helps RNA polymerase bind to the DNA

  3. It terminates transcription

  4. It provides the template for RNA synthesis
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The release factor releases the newly synthesized protein from the ribosome.

Multiple choice

What is the name of the process by which a protein is folded into its functional shape?

  1. Protein folding

  2. Protein synthesis

  3. Transcription

  4. Translation
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Protein folding is the process by which a protein is folded into its functional shape.

Multiple choice

What is the name of the process by which a protein is modified after it is synthesized?

  1. Protein modification

  2. Protein synthesis

  3. Transcription

  4. Translation
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Protein modification is the process by which a protein is modified after it is synthesized.

Multiple choice

What is the name of the process by which a protein is degraded?

  1. Protein degradation

  2. Protein synthesis

  3. Transcription

  4. Translation
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Protein degradation is the process by which a protein is degraded.

Multiple choice

What is the name of the process by which a protein is transported to its final destination?

  1. Protein targeting

  2. Protein synthesis

  3. Transcription

  4. Translation
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Protein targeting is the process by which a protein is transported to its final destination.

Multiple choice

What is the name of the process by which a protein interacts with other molecules?

  1. Protein interaction

  2. Protein synthesis

  3. Transcription

  4. Translation
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Protein interaction is the process by which a protein interacts with other molecules.

Multiple choice

CRISPR-Cas9 is a gene-editing tool that utilizes which type of RNA?

  1. Transfer RNA (tRNA)

  2. Messenger RNA (mRNA)

  3. Small Interfering RNA (siRNA)

  4. Guide RNA (gRNA)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

CRISPR-Cas9 utilizes Guide RNA (gRNA) to target and cut specific DNA sequences, enabling precise genome editing.

Multiple choice

What are the three main types of RNA?

  1. Messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA)

  2. Messenger RNA (mRNA), transfer RNA (tRNA), and microRNA (miRNA)

  3. Messenger RNA (mRNA), transfer RNA (tRNA), and small interfering RNA (siRNA)

  4. Messenger RNA (mRNA), transfer RNA (tRNA), and long non-coding RNA (lncRNA)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The three main types of RNA are messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA).

Multiple choice

What is the role of mRNA in protein synthesis?

  1. Carries genetic information from DNA to the ribosomes

  2. Transfers amino acids to the ribosomes

  3. Catalyzes the formation of peptide bonds

  4. Proofreads the newly synthesized protein
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Messenger RNA (mRNA) carries the genetic information from DNA to the ribosomes, where it serves as a template for protein synthesis.

Multiple choice

What is the role of tRNA in protein synthesis?

  1. Carries genetic information from DNA to the ribosomes

  2. Transfers amino acids to the ribosomes

  3. Catalyzes the formation of peptide bonds

  4. Proofreads the newly synthesized protein
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Transfer RNA (tRNA) molecules carry specific amino acids to the ribosomes during protein synthesis, based on the genetic code carried by mRNA.

Multiple choice

What is the role of rRNA in protein synthesis?

  1. Carries genetic information from DNA to the ribosomes

  2. Transfers amino acids to the ribosomes

  3. Catalyzes the formation of peptide bonds

  4. Forms the structure of the ribosome
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Ribosomal RNA (rRNA) forms the structural framework of the ribosome, the cellular machinery responsible for protein synthesis.

Multiple choice

Which of the following is NOT a type of RNA molecule?

  1. Messenger RNA (mRNA)

  2. Transfer RNA (tRNA)

  3. Ribosomal RNA (rRNA)

  4. Small nuclear RNA (snRNA)
Reveal answer Fill a bubble to check yourself
Correct answer
Explanation

Small nuclear RNA (snRNA) is not a type of RNA molecule. It is a type of non-coding RNA that is involved in the processing of pre-messenger RNA (pre-mRNA) in the nucleus.