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?

  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 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 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

What is a gene?

  1. A segment of DNA that codes for a protein

  2. A segment of RNA that codes for a protein

  3. A segment of DNA that codes for a non-protein molecule

  4. A segment of RNA that codes for a non-protein molecule
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A gene is a segment of DNA that codes for a protein.

Multiple choice

What is the term used to describe the hypothetical first self-replicating molecules that may have given rise to life on Earth?

  1. Protobionts

  2. Ribozymes

  3. RNA World

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

Protobionts are hypothetical first self-replicating molecules that may have given rise to life on Earth.

Multiple choice

What is the process by which DNA is copied?

  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. During replication, the two strands of DNA separate and each strand serves as a template for the synthesis of a new strand.

Multiple choice

What is 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. During transcription, one of the two strands of DNA serves as a template for the synthesis of a complementary RNA strand.

Multiple choice

What is 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. During translation, the sequence of nucleotides in an RNA molecule is used to determine the sequence of amino acids in a protein.

Multiple choice

What is the genetic material in viruses?

  1. DNA

  2. RNA

  3. Both DNA and RNA

  4. Neither DNA nor RNA
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The genetic material in viruses can be either DNA or RNA, depending on the type of virus.

Multiple choice

Which of the following is an example of a transcription factor involved in signal transduction?

  1. Nuclear factor kappa-B (NF-κB)

  2. Signal transducer and activator of transcription (STAT)

  3. Activator protein-1 (AP-1)

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

Nuclear factor kappa-B (NF-κB), signal transducer and activator of transcription (STAT), and activator protein-1 (AP-1) are all examples of transcription factors involved in signal transduction.

Multiple choice

What is the primary mechanism by which nuclear receptors mediate gene regulation?

  1. By binding to DNA and directly activating transcription

  2. By binding to DNA and inhibiting transcription

  3. By binding to G proteins and activating downstream signaling cascades

  4. By binding to ion channels and regulating ion flow
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Nuclear receptors are transcription factors that bind to specific DNA sequences and directly activate transcription of target genes.

Multiple choice

What is the capsid of a virus made of?

  1. Protein

  2. DNA

  3. RNA

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

The capsid of a virus is made up of protein molecules.

Multiple choice

What is the role of RNA polymerase in transcription?

  1. Unwinding the DNA double helix

  2. Synthesizing the RNA molecule

  3. Proofreading the RNA molecule

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

RNA polymerase is the enzyme that synthesizes the RNA molecule by adding nucleotides to the growing RNA chain.

Multiple choice

Which of the following is a type of RNA polymerase found in eukaryotes?

  1. RNA polymerase I

  2. RNA polymerase II

  3. RNA polymerase III

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

Eukaryotes have three types of RNA polymerase: RNA polymerase I, RNA polymerase II, and RNA polymerase III, each with specific roles in transcribing different types of RNA molecules.

Multiple choice

What is the function of the promoter region in a gene?

  1. Binding site for transcription factors

  2. Site of transcription initiation

  3. Region of DNA that is transcribed

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

The promoter region is a region of DNA located upstream of the transcription start site that contains binding sites for transcription factors, serves as the site of transcription initiation, and is part of the DNA that is transcribed.