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 name of the process by which RNA is translated 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 translated into protein. During translation, a ribosome binds to the mRNA template strand and reads the genetic code in a 5' to 3' direction, using transfer RNA (tRNA) molecules to bring the appropriate amino acids to the ribosome.

Multiple choice

Which of the following is NOT a type of RNA polymerase?

  1. RNA polymerase I

  2. RNA polymerase II

  3. RNA polymerase III

  4. RNA polymerase IV
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

RNA polymerase IV is not a type of RNA polymerase. RNA polymerase I, II, and III are the three main types of RNA polymerase in eukaryotes.

Multiple choice

What is the name of the process by which DNA is packaged into chromosomes?

  1. Replication

  2. Transcription

  3. Translation

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

Condensation is the process by which DNA is packaged into chromosomes. This process involves the coiling and folding of DNA around proteins called histones, resulting in the formation of compact structures called nucleosomes.

Multiple choice

Which of the following is NOT a type of gene regulation?

  1. Transcriptional regulation

  2. Translational regulation

  3. Post-translational regulation

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

Epigenetic regulation is not a type of gene regulation. Transcriptional regulation, translational regulation, and post-translational regulation are the three main types of gene regulation.

Multiple choice

Which of the following is the genetic material in most living organisms?

  1. DNA

  2. RNA

  3. Proteins

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

DNA (deoxyribonucleic acid) is the genetic material in most living organisms, including humans, animals, and plants. It contains the instructions for an organism's development, growth, and functioning.

Multiple choice

What is the central dogma of molecular biology?

  1. DNA → RNA → Proteins

  2. RNA → DNA → Proteins

  3. Proteins → DNA → RNA

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

The central dogma of molecular biology states that genetic information flows from DNA to RNA to proteins. DNA is transcribed into RNA, and RNA is translated into proteins.

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 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 RNA is synthesized from DNA?

  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 RNA is synthesized from DNA. During transcription, one strand of DNA serves as a template for the synthesis of a complementary RNA molecule. The RNA molecule is then released from the DNA template and can be used for protein synthesis or other cellular processes.

Multiple choice

What is the process by which proteins are synthesized from RNA?

  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 proteins are synthesized from RNA. During translation, the RNA molecule is read by a ribosome, which assembles amino acids in the correct order to form a protein. The sequence of amino acids in a protein is determined by the sequence of nucleotides in the RNA molecule.

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. Genes contain the instructions for an organism's development, growth, and functioning. Each gene codes for a specific protein, which performs a specific function in the organism.

Multiple choice

What is the name of the process by which developmental genes are expressed in the correct place and time?

  1. Gene regulation

  2. Transcription

  3. Translation

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

Gene regulation is the process by which the expression of genes is controlled. This includes the processes of transcription, translation, and differentiation.

Multiple choice

Which of the following is not a type of gene regulation?

  1. Transcriptional regulation

  2. Translational regulation

  3. Post-translational regulation

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

Post-translational regulation is the process by which the activity of a protein is modified after it has been translated. This is not a type of gene regulation.

Multiple choice

What is the term used to describe the process by which a gene is expressed to produce a protein?

  1. Gene Expression

  2. Protein Synthesis

  3. Translation

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

Gene expression is the process by which a gene is expressed to produce a protein.

Multiple choice

What is the central dogma of molecular biology?

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

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

  3. Protein is transcribed into DNA, which is then translated into RNA.

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

The central dogma of molecular biology states that the information in DNA is transcribed into RNA, which is then translated into protein. This process is essential for the production of proteins, which are the building blocks of cells and are responsible for a wide range of cellular functions.

Multiple choice

What is the role of DNA in the central dogma?

  1. It stores genetic information.

  2. It is transcribed into RNA.

  3. It is translated into protein.

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

DNA stores genetic information, is transcribed into RNA, and is translated into protein. It is the blueprint for all of the proteins that are produced in a cell.