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 role of ribosomes in translation?

  1. They bind to the RNA and read the sequence of codons

  2. They use the sequence of codons to assemble a chain of amino acids into a protein

  3. They proofread the protein for errors

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

Ribosomes are cellular structures that play a key role in translation. They bind to the RNA and read the sequence of codons. They then use the sequence of codons to assemble a chain of amino acids into a protein. Ribosomes also proofread the protein for errors.

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. 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. The three main types of RNA are messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA).

Multiple choice

What is the role of the ribosome in a bacterial cell?

  1. Protein synthesis

  2. DNA replication

  3. Energy production

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

Ribosomes are responsible for protein synthesis in both prokaryotic and eukaryotic cells.

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.

Multiple choice

What is the structure of RNA?

  1. A double helix

  2. A single helix

  3. A triple helix

  4. A quadruple helix
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

RNA is a single helix, meaning that it consists of a single strand of nucleotides.

Multiple choice

What is the process of transcription?

  1. The process of copying DNA into RNA

  2. The process of copying RNA into DNA

  3. The process of copying protein into DNA

  4. The process of copying DNA into protein
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Transcription is the process of copying DNA into RNA.

Multiple choice

What is the process of translation?

  1. The process of copying RNA into protein

  2. The process of copying DNA into protein

  3. The process of copying protein into RNA

  4. The process of copying DNA into RNA
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Translation is the process of copying RNA into protein.

Multiple choice

What is the genetic code?

  1. The set of rules that determines how DNA is translated into protein

  2. The set of rules that determines how RNA is translated into protein

  3. The set of rules that determines how protein is translated into DNA

  4. The set of rules that determines how RNA is translated into DNA
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The genetic code is the set of rules that determines how DNA is translated into protein.

Multiple choice

What is a gene?

  1. A region of DNA that codes for a protein

  2. A region of RNA that codes for a protein

  3. A region of DNA that codes for a RNA

  4. A region of RNA that codes for a DNA
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A gene is a region of DNA that codes for a protein.

Multiple choice

What is the primary focus of transcriptomics in bioinformatics?

  1. Analyzing gene expression patterns

  2. Predicting the structure of proteins

  3. Identifying disease-causing mutations

  4. Studying the interactions between biological molecules
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Transcriptomics in bioinformatics involves the study of gene expression patterns, including the identification of differentially expressed genes, the analysis of gene regulation, and the understanding of cellular responses to various stimuli or conditions.

Multiple choice

Biomolecular interactions play a crucial role in which of the following cellular processes?

  1. Signal transduction

  2. Gene expression

  3. Protein synthesis

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

Biomolecular interactions are essential for a wide range of cellular processes, including signal transduction, gene expression, and protein synthesis. These interactions allow cells to communicate with each other, respond to environmental cues, and carry out their various functions.

Multiple choice

What is the name of 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.

Multiple choice

What is the name of the process by which DNA is transcribed 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 transcribed into RNA.

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.

Multiple choice

Which codon codes for the start of a protein?

  1. AUG

  2. UAG

  3. UAA

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

The codon AUG codes for the start of a protein.