Biology

Molecular Biology and Genetics

985 Questions

Molecular biology and genetics explore the structure and function of DNA, RNA, genetic mutations, and heredity. Understanding these building blocks of life is essential for most biology examinations. Review these practice questions to test your molecular genetics knowledge.

DNA structure and basesGenetic mutationsNucleic acids compositionDNA sequencing and replication

Molecular Biology and Genetics Questions

Multiple choice

Which of the following is not a type of developmental gene that is discussed in Your Inner Fish?

  1. Hox genes

  2. Pax genes

  3. Wnt genes

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

Sox genes are not discussed in Your Inner Fish. Hox genes, Pax genes, and Wnt genes are all discussed in the book.

Multiple choice

What is the role of protein in the central dogma?

  1. It is the final product of gene expression.

  2. It carries out cellular functions.

  3. It regulates gene expression.

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

Protein is the final product of gene expression, carries out cellular functions, and regulates gene expression. It is a complex and essential molecule that plays a vital role in all living organisms.

Multiple choice

How many codons are there in the genetic code?

  1. 64

  2. 128

  3. 256

  4. 512
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

There are 64 codons in the genetic code. Each codon consists of three nucleotides and codes for a specific amino acid or a stop signal.

Multiple choice

Which microorganism is commonly used in the production of citric acid?

  1. Aspergillus niger

  2. Saccharomyces cerevisiae

  3. Lactobacillus acidophilus

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

Aspergillus niger is widely used in the industrial production of citric acid through fermentation.

Multiple choice

The genetic code is a set of rules that determines:

  1. The sequence of amino acids in a protein

  2. The sequence of nucleotides in a DNA molecule

  3. The sequence of nucleotides in an RNA molecule

  4. The structure of a protein
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The genetic code is a set of rules that determines the sequence of amino acids in a protein. It is based on the sequence of nucleotides in an RNA molecule, which is transcribed from a DNA molecule.

Multiple choice

A mutation is a:

  1. Change in the DNA sequence

  2. Change in the RNA sequence

  3. Change in the protein sequence

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

A mutation is a change in the DNA sequence, which can lead to a change in the RNA sequence and/or the protein sequence.

Multiple choice

Which of the following is NOT a type of mutation:

  1. Substitution

  2. Deletion

  3. Insertion

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

Transversion is not a type of mutation. Substitution, deletion, and insertion are all types of mutations that can occur in DNA.

Multiple choice

Which of the following is NOT a type of DNA repair:

  1. Base excision repair

  2. Nucleotide excision repair

  3. Mismatch repair

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

Homologous recombination is not a type of DNA repair. It is a process by which genetic information is exchanged between two similar DNA molecules.

Multiple choice

Which of the following is NOT a type of DNA mutation?

  1. Substitution

  2. Deletion

  3. Insertion

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

Transversion is a type of RNA mutation, not a DNA mutation.

Multiple choice

Which of the following is NOT a key component of systems biology?

  1. Genomics

  2. Proteomics

  3. Metabolomics

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

Thermodynamics is not a core component of systems biology, which focuses on understanding the interactions and dynamics of biological systems at the molecular and cellular levels.