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 name of the genetic code?

  1. The codon table

  2. The anticodon table

  3. The mRNA table

  4. The tRNA table
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The genetic code is also known as the codon table. It is a set of rules that specifies the relationship between the sequence of codons in mRNA and the sequence of amino acids in a protein.

Multiple choice

What is the function of RNA?

  1. To carry genetic information from DNA to the ribosome

  2. To help ribosomes make proteins

  3. To regulate gene expression

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

RNA is a single-stranded molecule that is similar to DNA. It is involved in a number of cellular processes, including carrying genetic information from DNA to the ribosome, helping ribosomes make proteins, and regulating gene expression.

Multiple choice

What is the central dogma of molecular biology?

  1. DNA makes RNA makes protein

  2. RNA makes DNA makes protein

  3. Protein makes DNA makes RNA

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

The central dogma of molecular biology states that DNA is transcribed into RNA, which is then translated into protein. This process is essential for the production of new proteins in cells.

Multiple choice

What is the function of a ribosome?

  1. To make proteins

  2. To transcribe DNA into RNA

  3. To regulate gene expression

  4. To package DNA into chromosomes
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Ribosomes are cellular structures that make proteins. They are composed of RNA and protein and are found in all living cells.

Multiple choice

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

  1. Messenger RNA (mRNA)

  2. Transfer RNA (tRNA)

  3. Ribosomal RNA (rRNA)

  4. Small nuclear RNA (snRNA)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Small nuclear RNA (snRNA) is not a type of RNA molecule, but rather a type of small non-coding RNA that is involved in the processing of pre-messenger RNA (pre-mRNA) into mature mRNA.

Multiple choice

What is the central dogma of molecular biology?

  1. DNA → RNA → Protein

  2. RNA → DNA → Protein

  3. Protein → DNA → RNA

  4. Protein → RNA → 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 flow of information from DNA to RNA to protein is essential for the expression of genetic information.

Multiple choice

What is the function of the ribosome in protein synthesis?

  1. To unwind the DNA double helix

  2. To proofread and correct errors in DNA synthesis

  3. To synthesize new DNA strands complementary to the template strands

  4. To assemble amino acids into a polypeptide chain according to the genetic code
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The ribosome is a complex molecular machine that assembles amino acids into a polypeptide chain according to the genetic code carried by messenger RNA (mRNA).

Multiple choice

What is the name of 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. During transcription, an enzyme called RNA polymerase binds to the DNA template strand and synthesizes a complementary RNA strand.

Multiple choice

Which of the following is NOT a type of genetic material?

  1. DNA

  2. RNA

  3. Protein

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

Polysaccharide is not a type of genetic material. DNA and RNA are the two main types of genetic material, while protein is a type of macromolecule that is essential for the structure and function of cells.

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.