Biology

Molecular Genetics

851 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 process by which DNA is copied during cell division called?

  1. Replication

  2. Transcription

  3. Translation

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

DNA replication is the process by which a cell makes a copy of its DNA.

Multiple choice

What is the process by which DNA is used to create RNA called?

  1. Replication

  2. Transcription

  3. Translation

  4. Mutation
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Transcription is the process by which DNA is used to create RNA.

Multiple choice

What is the process by which RNA is used to create proteins called?

  1. Replication

  2. Transcription

  3. Translation

  4. Mutation
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Translation is the process by which RNA is used to create proteins.

Multiple choice

Which enzyme is responsible for the hydrolysis of RNA to its constituent nucleotides?

  1. Ribonuclease A

  2. Ribonuclease H

  3. Ribonuclease P

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

Ribonuclease A is an endoribonuclease that catalyzes the hydrolysis of RNA at specific internal phosphodiester bonds, resulting in the release of individual nucleotides.

Multiple choice

What is the first step in protein synthesis?

  1. Transcription

  2. Translation

  3. Replication

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

Transcription is the process of copying the genetic information from DNA into a complementary RNA molecule.

Multiple choice

Which enzyme is responsible for catalyzing the transcription of DNA into RNA?

  1. RNA polymerase

  2. DNA polymerase

  3. Helicase

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

RNA polymerase is the enzyme that catalyzes the transcription of DNA into RNA.

Multiple choice

What is the role of the promoter region in transcription?

  1. It signals the start of transcription

  2. It provides the template for RNA synthesis

  3. It helps RNA polymerase bind to the DNA

  4. It terminates transcription
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The promoter region is a specific DNA sequence that signals the start of transcription.

Multiple choice

What is the process of converting RNA into a protein called?

  1. Transcription

  2. Translation

  3. Replication

  4. Mutation
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Translation is the process of converting the genetic information in RNA into a protein.

Multiple choice

What is the role of tRNA in translation?

  1. It carries amino acids 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

tRNA molecules carry amino acids to the ribosome during translation.

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.