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

Which codons code for the stop of a protein?

  1. UAG

  2. UAA

  3. UGA

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

The codons UAG, UAA, and UGA all code for the stop of a protein.

Multiple choice

What is the name of the enzyme that catalyzes the transcription of DNA into RNA?

  1. DNA polymerase

  2. RNA polymerase

  3. Reverse transcriptase

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

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

Multiple choice

What is the name of the enzyme that catalyzes the translation of RNA into protein?

  1. DNA polymerase

  2. RNA polymerase

  3. Reverse transcriptase

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

The ribosome is the enzyme that catalyzes the translation of RNA into protein.

Multiple choice

What is the name of the molecule that carries the genetic information from DNA to the ribosome?

  1. Messenger RNA (mRNA)

  2. Transfer RNA (tRNA)

  3. Ribosomal RNA (rRNA)

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

Messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA) all carry the genetic information from DNA to the ribosome.

Multiple choice

What is the name of the short RNA molecule that primes DNA synthesis on the lagging strand during replication?

  1. Helicase

  2. Polymerase

  3. Ligase

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

Primase is the enzyme that synthesizes the short RNA molecule that primes DNA synthesis on the lagging strand during replication.

Multiple choice

What is the name of the process by which DNA is copied from one generation to the next?

  1. Replication

  2. Transcription

  3. Translation

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

Replication is the process by which DNA is copied from one generation to the next.

Multiple choice

What is the name of the process by which DNA is converted into RNA?

  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 converted into RNA.

Multiple choice

What is the name of the process by which RNA is converted into protein?

  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 converted into protein.

Multiple choice

Which biomolecule is responsible for storing and transmitting genetic information?

  1. Carbohydrates

  2. Proteins

  3. Lipids

  4. Nucleic acids
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Nucleic acids, including DNA and RNA, carry and transmit genetic information essential for cell division, protein synthesis, and inheritance.

Multiple choice

Which of the following is a commonly used bioinformatics tool for gene expression analysis?

  1. Microarray analysis

  2. RNA-Seq

  3. ChIP-Seq

  4. ATAC-Seq
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

RNA-Seq (RNA sequencing) is a high-throughput sequencing technique used to analyze gene expression levels by measuring the abundance of RNA transcripts in a sample.

Multiple choice

What is the role of RNA in protein synthesis?

  1. Genetic material

  2. Energy storage

  3. Protein synthesis

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

RNA (ribonucleic acid) plays a crucial role in protein synthesis. It carries the genetic information from DNA to the ribosomes, where it serves as a template for the synthesis of proteins.

Multiple choice

Which of the following is not a technique used in biophysics?

  1. X-ray crystallography

  2. NMR spectroscopy

  3. Electron microscopy

  4. Polymerase chain reaction
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Polymerase chain reaction is a technique used in molecular biology, not biophysics.

Multiple choice

What is the name of the molecule that carries genetic information in cells?

  1. DNA

  2. RNA

  3. Protein

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

DNA is the molecule that carries genetic information in cells.

Multiple choice

Which of the following is a type of RNA involved in protein synthesis?

  1. Messenger RNA (mRNA)

  2. Transfer RNA (tRNA)

  3. Ribosomal RNA (rRNA)

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

mRNA carries the genetic code from DNA to the ribosome, tRNA brings the appropriate amino acids to the ribosome, and rRNA is a component of the ribosome itself.

Multiple choice

What is the process by which RNA is synthesized?

  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 RNA molecule is synthesized from a DNA template.