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 central dogma of molecular biology?

  1. DNA makes RNA, RNA makes proteins

  2. RNA makes DNA, DNA makes proteins

  3. Proteins make DNA, DNA makes RNA

  4. Proteins make RNA, RNA makes DNA
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The central dogma of molecular biology states that DNA makes RNA, and RNA makes proteins. This flow of genetic information from DNA to RNA to proteins is essential for the synthesis of proteins, which are the building blocks of cells and perform various functions in living organisms.

Multiple choice

Which of the following is NOT a type of RNA?

  1. Messenger RNA (mRNA)

  2. Transfer RNA (tRNA)

  3. Ribosomal RNA (rRNA)

  4. Deoxyribonucleic acid (DNA)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Deoxyribonucleic acid (DNA) is not a type of RNA. RNA molecules are composed of ribose sugar, while DNA molecules are composed of deoxyribose sugar.

Multiple choice

Which of the following is an example of a transcription factor?

  1. c-Jun

  2. c-Fos

  3. NF-κB

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

c-Jun, c-Fos, and NF-κB are all examples of transcription factors that are involved in various cellular signaling pathways.

Multiple choice

Which of the following is the primary genetic material in prokaryotic cells?

  1. DNA

  2. RNA

  3. Protein

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

Prokaryotic cells, such as bacteria and archaea, store their genetic information primarily in the form of DNA (deoxyribonucleic acid).

Multiple choice

Which enzyme is responsible for synthesizing the RNA primers that are required for DNA replication?

  1. DNA polymerase

  2. Helicase

  3. Ligase

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

Primase is the enzyme that is responsible for synthesizing the RNA primers that are required for DNA replication. RNA primers are short pieces of RNA that are used to initiate DNA synthesis on the lagging strand. Primase synthesizes RNA primers in a 5' to 3' direction.

Multiple choice

Which genetic material is passed from parents to offspring?

  1. DNA

  2. RNA

  3. Proteins

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

DNA is the genetic material that is passed from parents to offspring, containing the instructions for an organism's development and characteristics.

Multiple choice

What is the term for the process by which DNA is copied 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 copied into RNA, creating a messenger molecule that carries the genetic information to the ribosomes for protein synthesis.

Multiple choice

What is the term for the process by which RNA is used to synthesize 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 RNA is used to synthesize proteins, involving the decoding of the genetic code and the assembly of amino acids into a polypeptide chain.

Multiple choice

Which bioinformatics approach is used to analyze the structure and function of RNA molecules?

  1. Transcriptomics

  2. Proteomics

  3. Metabolomics

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

Transcriptomics is the study of the structure and function of RNA molecules, including their expression levels, interactions, and role in cellular processes.

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.