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

The incorrect match is

  1. Silk—Polyamide

  2. Indigo - Azo dye

  3. Lipase - Enzyme

  4. Keratin - Protein
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Indigo is a natural vat dye, not an azo dye. Azo dyes contain the N=N group, which indigo does not.

Multiple choice

Enzymes are made of

  1. carbohydrates

  2. amino acids

  3. nucleosides

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

Enzymes are biological catalysts that are almost exclusively proteins, which are polymers composed of amino acids.

Multiple choice

The protein present in the finger nail is

  1. Globin

  2. Myosin

  3. Keratin

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

Keratin is a fibrous structural protein that is the key component of hair, skin, and nails in humans and other vertebrates.

Multiple choice

Ceruloplasmin is a type of

  1. metalloprotein

  2. phospholipid

  3. polysaccaharide

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Ceruloplasmin is a copper-carrying protein in the blood, making it a metalloprotein.

Multiple choice

Viruses synthesize their protein coat

  1. outside the host

  2. inside the host

  3. both inside and outside the host

  4. in sugary medium
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Viruses are obligate intracellular parasites, meaning they lack the machinery to synthesize proteins on their own and must use the host cell's ribosomes.

Multiple choice

Haemoglobin is an iron-containing

  1. nucleic acid

  2. protein

  3. antibody

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

Haemoglobin is a complex protein found in red blood cells that contains iron and is responsible for transporting oxygen. It is not an acid, antibody, or hormone.

Multiple choice

In the process of blood clotting, the threads formed are made up of:

  1. thrombin

  2. fibrin

  3. fibrinogen

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

Fibrin (also called Factor Ia) is a fibrous protein, involved in the clotting of blood, and is non-globular. It is a fibrillar protein, that is polymerised to form a mesh, that forms a hemostatic plug or clot (in conjunction with platelets) over a wound site. Fibrin is involved in the following biological processes: signal transduction, blood coagulation, platelet activation and protein polymerization.

Multiple choice

Which of the following is a protein that occurs in the cell membranes of some single-celled prokaryotes?

  1. Alpha secretase

  2. Amino acid permease

  3. Archaeosortase

  4. Sheddase

  5. LRRC24
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This option is correct. Archaeosortase is a protein that occurs in the cell membranes of some single-celled prokaryotes. Archaeosortases recognise and remove carboxyl-terminal protein sorting signals, about 25 amino acids long from secreted proteins.

Multiple choice

Which of the following protein families consists of small proteins having 50 to 65 amino acyl residues and exhibits a single N-terminal transmembrane domain?

  1. Tellurium ion resistance family

  2. Vibrio holin family

  3. NP-holin family

  4. EPPE-holin family

  5. P68 holin family
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This option is correct. Vibrio holin family consists of small proteins having 50 to 65 amino acyl residues in length and exhibits a single N-terminal transmembrane domain.

Multiple choice

Match List I (polymers) with List II (types of hybridisation).

 
List I List II
(i) Cellulosome a. Nitrocellulose
(ii) Ethulose b. Membrane made of cellulose
(iii) Cuprophane c. Laxative
(iv) Parkesine d. Multi-enzyme complex

  1. (i) - d, (ii) - c, (iii) - b, (iv) - a

  2. (i) - a, (ii) - c, (iii) - b, (iv) - d

  3. (i) - c, (ii) - d, (iii) - b, (iv) - a

  4. (i) - d, (ii) - b, (iii) - c, (iv) - a

  5. (i) - b, (ii) - d, (iii) - a, (iv) - c
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This option is correct. Cellulosome is a multi-enzyme complex. Ethulose is a laxative. Cuprophane is a membrane made of cellulose. Parkesine is a nitrocellulose.

Multiple choice

The permeases are

  1. structural membrane proteins

  2. enzymatic membrane proteins

  3. carrier membrane proteins

  4. None of above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Permeases are carrier membrane proteins which helps in transmembrane transportation.