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 molecule that carries genetic information from DNA to the ribosome?

  1. Messenger RNA (mRNA)

  2. Transfer RNA (tRNA)

  3. Ribosomal RNA (rRNA)

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

Messenger RNA (mRNA) carries genetic information from DNA to the ribosome, where it is used to direct protein synthesis.

Multiple choice

What is the difference between a transcriptome and a genome?

  1. A transcriptome is a complete set of RNA molecules in a cell, while a genome is a complete set of DNA molecules in a cell.

  2. A transcriptome is a subset of the genome that is expressed as RNA, while a genome is the complete set of DNA molecules in a cell.

  3. A transcriptome is a dynamic entity that changes over time, while a genome is a static entity that does not change.

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

A transcriptome is a complete set of RNA molecules in a cell, while a genome is a complete set of DNA molecules in a cell. A transcriptome is a subset of the genome that is expressed as RNA, and it is a dynamic entity that changes over time.

Multiple choice

What are the main types of RNA molecules?

  1. Messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA)

  2. Small nuclear RNA (snRNA), small interfering RNA (siRNA), and microRNA (miRNA)

  3. Long non-coding RNA (lncRNA), circular RNA (circRNA), and pseudogenes

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

The main types of RNA molecules are messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). Other types of RNA molecules include small nuclear RNA (snRNA), small interfering RNA (siRNA), microRNA (miRNA), long non-coding RNA (lncRNA), circular RNA (circRNA), and pseudogenes.

Multiple choice

What is the role of mRNA in protein synthesis?

  1. mRNA carries the genetic code from the nucleus to the cytoplasm.

  2. mRNA is used to create a template for protein synthesis.

  3. mRNA is translated into a chain of amino acids.

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

mRNA carries the genetic code from the nucleus to the cytoplasm, where it is used to create a template for protein synthesis. mRNA is translated into a chain of amino acids, which are then folded into a protein.

Multiple choice

What is the role of tRNA in protein synthesis?

  1. tRNA brings amino acids to the ribosome.

  2. tRNA matches the codon on the mRNA to the correct amino acid.

  3. tRNA helps to form the peptide bond between amino acids.

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

tRNA brings amino acids to the ribosome, where it matches the codon on the mRNA to the correct amino acid. tRNA also helps to form the peptide bond between amino acids.

Multiple choice

What is the role of rRNA in protein synthesis?

  1. rRNA is a component of the ribosome.

  2. rRNA helps to catalyze the formation of the peptide bond between amino acids.

  3. rRNA provides a structural framework for the ribosome.

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

rRNA is a component of the ribosome, where it helps to catalyze the formation of the peptide bond between amino acids. rRNA also provides a structural framework for the ribosome.

Multiple choice

What is the role of aptamers in biosensor technology?

  1. Synthetic DNA or RNA molecules

  2. Antibodies produced by the immune system

  3. Enzymes that catalyze specific reactions

  4. Receptors for specific molecules
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Aptamers are synthetic DNA or RNA molecules that can bind to specific target molecules with high affinity and specificity. They are often used in biosensors as recognition elements for detecting the presence of target molecules.

Multiple choice

What is the process of using a complementary DNA strand to synthesize a new DNA strand called?

  1. Transcription

  2. Translation

  3. Replication

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

Reverse Transcription is the process of synthesizing a complementary DNA strand from an RNA template using the enzyme Reverse Transcriptase.

Multiple choice

What is the term for the process by which a gene is transcribed into RNA?

  1. Gene Expression

  2. Transcription

  3. Translation

  4. Replication
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Transcription is the process by which the information encoded in a gene is copied 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 responsible for synthesizing RNA molecules from a DNA template during transcription.

Multiple choice

What is the process of converting RNA into a protein called?

  1. Gene Expression

  2. Transcription

  3. Translation

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

Translation is the process by which the information encoded in an RNA molecule is used to synthesize a protein.

Multiple choice

What is the term for the region of DNA that codes for a specific protein?

  1. Exon

  2. Intron

  3. Promoter

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

Exons are the regions of DNA that code for a specific protein, while introns are non-coding regions that are removed during RNA splicing.

Multiple choice

What is the term for the process of using a complementary RNA strand to synthesize a new RNA strand?

  1. PCR

  2. DNA Sequencing

  3. RNA Replication

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

RNA replication is the process by which a new RNA strand is synthesized using a complementary RNA strand as a template.

Multiple choice

What is the term used to describe the hypothetical stage in the evolution of life on Earth when RNA molecules played a central role in genetic information storage and catalysis?

  1. The RNA World Hypothesis

  2. The DNA World Hypothesis

  3. The Protein World Hypothesis

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

The RNA world hypothesis proposes that RNA molecules, rather than DNA or proteins, were the primary carriers of genetic information in the early stages of life on Earth.

Multiple choice

Which type of molecule is responsible for carrying genetic information in cells?

  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 molecule responsible for carrying genetic information in cells, providing the instructions for an organism's development and functioning.