Biology ยท Chemistry

Biomolecules and Enzymes

1,432 Questions

This topic focuses on biomolecules, specifically proteins, enzymes, and amino acids. It includes questions on enzyme structures, protein folding, and catalysis. These concepts are crucial for medical and biology competitive exams.

Enzyme catalysisProtein structuresAmino acid synthesisPolypeptide chainsBiomolecule properties

Biomolecules and Enzymes Questions

Multiple choice

Which type of biosensor utilizes the principle of antigen-antibody interaction?

  1. Electrochemical biosensors

  2. Optical biosensors

  3. Piezoelectric biosensors

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

Immunosensors employ the specific binding between antigens and antibodies to detect and quantify target molecules.

Multiple choice

Which type of biosensor utilizes the principle of surface plasmon resonance (SPR)?

  1. Electrochemical biosensors

  2. Optical biosensors

  3. Piezoelectric biosensors

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

Optical biosensors based on SPR detect and quantify target molecules by monitoring changes in the refractive index at the sensor surface.

Multiple choice

What is the process by which proteins are broken down into amino acids, which are then used for energy?

  1. Proteolysis

  2. Glycolysis

  3. Gluconeogenesis

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

Proteolysis is the process by which proteins are broken down into amino acids, which can then be used for energy.

Multiple choice

Which amino acid is most commonly used for energy during exercise?

  1. Alanine

  2. Glutamine

  3. Leucine

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

Alanine is the most commonly used amino acid for energy during exercise because it can be easily converted to glucose.

Multiple choice

What is the storage form of proteins in the body?

  1. Muscle tissue

  2. Adipose tissue

  3. Liver glycogen

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

Muscle tissue is the storage form of proteins in the body.

Multiple choice

Which of the following is a type of post-translational modification that can affect protein function?

  1. Phosphorylation

  2. Glycosylation

  3. Ubiquitination

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

Phosphorylation, glycosylation, and ubiquitination are all types of post-translational modifications that can affect protein function by altering the protein's structure, activity, or localization.

Multiple choice

What is the primary protein found in milk?

  1. Casein

  2. Whey

  3. Albumin

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

Casein is the predominant protein in milk, accounting for approximately 80% of its total protein content.

Multiple choice

What is the basic structure of an antibody molecule?

  1. Two heavy chains and two light chains

  2. Two heavy chains and one light chain

  3. Two heavy chains and three light chains

  4. Two heavy chains and four light chains
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

An antibody molecule consists of two identical heavy chains and two identical light chains, arranged in a Y-shaped structure. The heavy chains determine the antibody's class and effector functions, while the light chains contribute to antigen binding.

Multiple choice

What are enzymes?

  1. Proteins that catalyze chemical reactions

  2. Proteins that transport molecules across cell membranes

  3. Proteins that regulate gene expression

  4. Proteins that repair DNA damage
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Enzymes are proteins that catalyze chemical reactions.

Multiple choice

What are adhesins?

  1. Proteins that allow bacteria to attach to host cells

  2. Proteins that allow viruses to attach to host cells

  3. Proteins that allow fungi to attach to host cells

  4. Proteins that allow parasites to attach to host cells
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Adhesins are proteins that allow bacteria to attach to host cells.

Multiple choice

Which type of protein is best for muscle growth and repair in combat sports athletes?

  1. Plant-based protein

  2. Animal-based protein

  3. Both plant-based and animal-based protein
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Both plant-based and animal-based proteins can contribute to muscle growth and repair. A combination of both types of protein is recommended for combat sports athletes.

Multiple choice

Which of the following is the primary protein found in milk?

  1. Lactose

  2. Casein

  3. Albumin

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

Casein is the most abundant protein in milk, accounting for approximately 80% of its total protein content.

Multiple choice

Which amino acid is often supplemented in poultry diets due to its low levels in plant-based feed ingredients?

  1. Methionine

  2. Lysine

  3. Threonine

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

Methionine is commonly supplemented in poultry diets as it is often deficient in plant-based feed ingredients.

Multiple choice

Which of the following is NOT a type of alternative protein?

  1. Plant-based protein

  2. Insect-based protein

  3. Lab-grown meat

  4. Dairy-free milk
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Dairy-free milk is not a type of alternative protein.

Multiple choice

Which of the following is NOT a type of alternative protein?

  1. Plant-based protein

  2. Insect-based protein

  3. Lab-grown meat

  4. Dairy-free milk
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Dairy-free milk is not a type of alternative protein.