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 term for the process by which a cell uses a small RNA molecule to silence the expression of a specific gene?

  1. Transcriptional silencing

  2. Translational silencing

  3. Gene silencing

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

Gene silencing is the process by which a cell uses a small RNA molecule to silence the expression of a specific gene. It is a powerful tool for studying gene function and has potential therapeutic applications.

Multiple choice

What is the genetic material of a virus?

  1. DNA

  2. RNA

  3. Both DNA and RNA

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Viruses can have either DNA or RNA as their genetic material. Some viruses, such as HIV, have a single-stranded RNA genome, while others, such as herpes simplex virus, have a double-stranded DNA genome.

Multiple choice

What is the central dogma of molecular biology?

  1. DNA is transcribed into RNA, which is then translated into proteins.

  2. RNA is transcribed into DNA, which is then translated into proteins.

  3. Proteins are transcribed into DNA, which is then translated into RNA.

  4. DNA is translated into proteins, which are then transcribed into RNA.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The central dogma of molecular biology describes the flow of genetic information from DNA to RNA to proteins.

Multiple choice

What is the relationship between DNA and RNA?

  1. DNA is transcribed into RNA, which is then translated into proteins.

  2. RNA is transcribed into DNA, which is then translated into proteins.

  3. DNA and RNA are two different forms of genetic material that do not interact with each other.

  4. DNA and RNA are identical molecules.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

DNA is transcribed into RNA, which is then translated into proteins, according to the central dogma of molecular biology.

Multiple choice

What is the role of the ribosome in protein synthesis?

  1. The ribosome assembles amino acids into a polypeptide chain.

  2. The ribosome reads the genetic code in mRNA and translates it into a sequence of amino acids.

  3. The ribosome provides the energy required for protein synthesis.

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

The ribosome plays a central role in protein synthesis, assembling amino acids into a polypeptide chain, reading the genetic code in mRNA and translating it into a sequence of amino acids, and providing the energy required for protein synthesis.

Multiple choice

What is the primary genetic material found in bacteria?

  1. DNA

  2. RNA

  3. Protein

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

DNA (deoxyribonucleic acid) is the primary genetic material found in bacteria, containing the genetic instructions for the cell's functions and characteristics.

Multiple choice

What is the function of the ribosome in bacteria?

  1. Protein synthesis

  2. DNA replication

  3. RNA transcription

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

The ribosome is a complex structure in bacteria responsible for protein synthesis, translating the genetic information in mRNA into a sequence of amino acids to form proteins.

Multiple choice

What is the process by which bacteria regulate gene expression?

  1. Transcriptional regulation

  2. Translational regulation

  3. Post-translational regulation

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

Bacteria regulate gene expression through various mechanisms, including transcriptional regulation (controlling the initiation of transcription), translational regulation (controlling the translation of mRNA into protein), and post-translational regulation (modifying proteins after translation).

Multiple choice

Which of the following is a type of RNA molecule that plays a role in gene regulation?

  1. Messenger RNA (mRNA)

  2. Transfer RNA (tRNA)

  3. Ribosomal RNA (rRNA)

  4. MicroRNA (miRNA)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

MicroRNAs (miRNAs) are small RNA molecules that play a role in gene regulation by binding to messenger RNA (mRNA) and preventing its translation into protein.

Multiple choice

Which molecule serves as the primary genetic material in most organisms?

  1. DNA

  2. RNA

  3. Protein

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

Deoxyribonucleic acid (DNA) is the primary genetic material in most organisms, carrying the instructions for an organism's development, functioning, and reproduction.

Multiple choice

What is the process by which DNA is copied to produce two identical copies?

  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 an identical copy of its DNA prior to cell division.

Multiple choice

What is the process by which the genetic information in DNA is converted into a 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 the genetic code in mRNA is converted into a sequence of amino acids, forming a protein.

Multiple choice

What is the term for a region of DNA that contains the instructions for making a specific protein?

  1. Gene

  2. Exon

  3. Intron

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

A gene is a region of DNA that contains the instructions for making a specific protein.

Multiple choice

What is the term for the study of the entire set of RNA molecules in an organism?

  1. Genomics

  2. Proteomics

  3. Transcriptomics

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

Transcriptomics is the study of the entire set of RNA molecules in an organism.

Multiple choice

Which biological molecule is responsible for storing genetic information?

  1. DNA

  2. RNA

  3. Protein

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

DNA (deoxyribonucleic acid) is the molecule responsible for storing genetic information in living organisms.