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

Which molecule serves as the template for mRNA synthesis during transcription?

  1. DNA

  2. RNA

  3. Protein

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

During transcription, DNA serves as the template for synthesizing a complementary mRNA molecule, which carries the genetic information to the ribosome for protein synthesis.

Multiple choice

What is the process by which mRNA is synthesized from a DNA template 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 an mRNA molecule is synthesized from a DNA template using RNA polymerase, creating a complementary copy of the genetic information.

Multiple choice

Which molecule carries the genetic information from the nucleus to the ribosome for protein synthesis?

  1. DNA

  2. RNA

  3. Protein

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

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

Multiple choice

What is the process by which the genetic information in mRNA is converted into a sequence of amino acids 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 the genetic information in mRNA is converted into a sequence of amino acids, which are linked together to form a protein.

Multiple choice

Which molecule is responsible for recognizing the codon on mRNA and bringing the corresponding amino acid to the ribosome during translation?

  1. Transfer RNA (tRNA)

  2. Messenger RNA (mRNA)

  3. Ribosomal RNA (rRNA)

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

Transfer RNA (tRNA) molecules recognize the codons on mRNA and bring the corresponding amino acids to the ribosome during translation.

Multiple choice

What is the role of ribosomal RNA (rRNA) in protein synthesis?

  1. Catalyzing the formation of peptide bonds

  2. Carrying genetic information

  3. Recognizing codons on mRNA

  4. Providing structural support to the ribosome
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Ribosomal RNA (rRNA) provides structural support to the ribosome and facilitates the interaction between mRNA and tRNA during protein synthesis.

Multiple choice

What is the term for a mutation that results in the premature termination of protein synthesis?

  1. Silent mutation

  2. Missense mutation

  3. Nonsense mutation

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

A nonsense mutation results in the premature termination of protein synthesis by introducing a stop codon in the mRNA sequence.

Multiple choice

Which type of mutation results in a shift in the reading frame of the genetic code?

  1. Silent mutation

  2. Missense mutation

  3. Nonsense mutation

  4. Frameshift mutation
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A frameshift mutation results in a shift in the reading frame of the genetic code, causing a completely different sequence of amino acids to be produced.

Multiple choice

Which enzyme is responsible for catalyzing the formation of peptide bonds during protein synthesis?

  1. DNA polymerase

  2. RNA polymerase

  3. Ligase

  4. Peptidyl transferase
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Peptidyl transferase is the enzyme responsible for catalyzing the formation of peptide bonds between adjacent amino acids during protein synthesis.

Multiple choice

Which cellular process is responsible for synthesizing new proteins?

  1. Transcription

  2. Translation

  3. DNA Replication

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

Translation is the process by which the genetic information encoded in mRNA is converted into a sequence of amino acids, resulting in the synthesis of new proteins.

Multiple choice

What is the role of CRISPR RNA (crRNA) in CRISPR-Cas9?

  1. It guides Cas9 to the target DNA sequence.

  2. It cuts DNA at a specific location.

  3. It repairs DNA.

  4. It transcribes DNA.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

crRNA is a small RNA molecule that guides Cas9 to the target DNA sequence. This allows Cas9 to cut the DNA at the correct location.

Multiple choice

What is the name of the RNA molecule that guides Cas9 to the target DNA sequence?

  1. crRNA

  2. tracrRNA

  3. sgRNA

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

crRNA, tracrRNA, and sgRNA are all RNA molecules that can guide Cas9 to the target DNA sequence.

Multiple choice

What is the process by which genetic information encoded in DNA is copied into a complementary RNA molecule?

  1. Transcription

  2. Translation

  3. Replication

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

Transcription is the process by which an enzyme called RNA polymerase synthesizes a complementary RNA molecule using one strand of DNA as a template.

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. It unwinds the DNA double helix, synthesizes a complementary RNA strand, and then rewinds the DNA.

Multiple choice

What is the name of the RNA molecule that is synthesized during transcription and serves as a template for protein synthesis?

  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
A Correct answer
Explanation

Messenger RNA (mRNA) is the RNA molecule that is synthesized during transcription and serves as a template for protein synthesis. It carries the genetic information from DNA to the ribosomes, where it is translated into a protein.