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 of the following is a type of nucleic acid?

  1. DNA

  2. RNA

  3. Proteins

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

DNA is a type of nucleic acid that carries genetic information.

Multiple choice

What is the term for the process by which cells regulate the expression of genes?

  1. Transcription

  2. Translation

  3. Gene regulation

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

The term for the process by which cells regulate the expression of genes is gene regulation.

Multiple choice

What is the primary 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 (deoxyribonucleic acid) is the primary molecule that carries genetic information in cells. It is a double-stranded molecule composed of nucleotides, each consisting of a sugar molecule, a phosphate group, and a nitrogenous base.

Multiple choice

What is the process by which DNA is copied during cell division?

  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 cell division. During replication, the DNA double helix unwinds and each strand serves as a template for the synthesis of a new complementary strand. This results in the formation of two identical copies of the original DNA molecule.

Multiple choice

What is the process by which the genetic information in DNA is used to direct the synthesis of proteins?

  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 the genetic information in DNA is used to direct the synthesis of proteins. During transcription, a specific region of DNA is copied into a complementary RNA molecule. This RNA molecule, known as messenger RNA (mRNA), carries the genetic information to the ribosomes, where it is used to direct the synthesis of proteins.

Multiple choice

What is the process by which the genetic information in mRNA is used to direct the synthesis of proteins?

  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 used to direct the synthesis of proteins. During translation, the mRNA molecule is read by ribosomes, which use the genetic code to determine the sequence of amino acids in the protein. The amino acids are then linked together to form a polypeptide chain, which folds into a specific three-dimensional structure to form the functional protein.

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.