Biology · Chemistry

Biomolecules and Enzymes

1,501 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

Enzymes behave as

  1. proteins

  2. fats

  3. carbohydrates

  4. nucleic acid

  5. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Most enzymes are proteins, although a few are catalytic RNA molecules. 

Multiple choice

Which amino acid acts as alpha-helix terminator?

  1. Proline

  2. Tryptophan

  3. Lysine

  4. Tyrosine

  5. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Proline acts as a structural disruptor in the middle of regular secondary structure elements, such as alpha helices and beta sheets.

Multiple choice

Which of the following compounds shows the aromatic properties?

  1. Valine

  2. Leucine

  3. Serine

  4. Tryosine

  5. None of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This option is correct because the tryosine can represent the aromatic properties. It is a alpha-amino beta(p-hydroxyphenyl) propionoic acid. It has aromatic nucleus. It is aromatic amino acid.

Multiple choice

Which of the following statements is/are not false?

  1. The solubility of α-Amino acid is minimum at isoelectric point.

  2. The blood platelets provides immunity against microorganisms.

  3. The bigger molecules are breaking down in smaller molecules during respiration.

  4. Cancer is a congenital disease.

  5. Denaturation involves changes in the primary structure of proteins.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This statement is true because at isoelectric point an α-amino acid has the minimum solubility.

Multiple choice

The enzymes used in many medical diagnostic techniques are ________.

  1. transferases

  2. lyases

  3. isomerases

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

This class of enzymes is responsible for the catalysis, of biochemical reactions, during which the ions other than hydrogen, are transferred between the reactants. A good example of this type of enzyme, is the class known as the transamidases, that transfer amide ions across reactants; many medical diagnostic techniques employ these enzymes.

Multiple choice

Coprophagus refers to animals feeding on _______.

  1. dead and / or decaying organic matter

  2. feces

  3. blood

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

Coprophagia is the consumption of feces. Many animal species practice coprophagia .Coprophagy refers to many kind of feces eating including eating feces, of other species, other individuals, or its own, those once deposited or taken directly, from the anus.

Multiple choice

Proteolytic protein digesting enzymes belongs to _____.

  1. hydrolases

  2. transferases

  3. lyases

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

This class of enzymes, are involved in the catalysis of chemical reactions, in which the chemical bonds are broken off through the addition, of a molecule of water. More properly, it can be understood as the addition of hydrogen [H] to a fragment of the molecule, while a hydroxide [OH] ion is fixed to the other molecule fragment. This important class of enzymes includes the familiar proteolytic protein digesting enzymes, the lipolytic fat digesting enzymes and the amylolytic carbohydrate digesting enzymes.

Multiple choice

Transamides are examples of _____.

  1. hdrolases

  2. transferases

  3. lyases

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

This class of enzymes is responsible for the catalysis, of biochemical reactions, during which the ions other than hydrogen are transferred, between the reactants. A good example of this type of enzyme, is the class known as the transamidases, that transfer amide ions across reactants; many medical diagnostic techniques employ these enzymes.

Multiple choice

Which of the following is not an acute phase protein in human beings?

  1. Serum amyloid P component

  2. Chondroitin sulphate

  3. C-reactive protein

  4. Mannose binding lectin

  5. Fibrinogen
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Chondroitin sulphate is a molecule that is found naturally in the body. It has mostly been used to treat joint disorders such as osteoarthritis. This is a cell matrix component.

Multiple choice

The enzyme present in tears is

  1. ensozyme

  2. lysozyme

  3. lactozyme

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The enzyme present in tears is lysozyme. It has antimicrobial action.