• Types of Proteins (GATE)
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Types of Proteins (GATE)

Description: GATE
Number of Questions: 15
Created by:
Tags: GATE Transcription and Translation Amino Acids and Nucleotides Proteins Enzyme Catalysis
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Which of the following are tripeptides?

  1. Glutathione
  2. Thyrotropin-releasing hormone
  3. Carnosine
  4. Anserine

  1. 1 and 2

  2. 1 and 4

  3. 2 and 3

  4. 2 and 4

  5. 3 and 4

Show answer
Correct Option: A
Explanation:

This option is correct.

Which of the following statements is/are not correct?

P. Coordination number of iron in rubredoxin is 6. Q. Oxidation state of iron in transferrin is 2. R. Haemosiderin is a cell Fe storage protein. S. The protein coat of ferritin is a hollow sphere of 24 polypeptide chains.

  1. P and Q

  2. P and R

  3. P and S

  4. Q and R

  5. R and S

Show answer
Correct Option: A
Explanation:

This option is correct. This option is wrong because haemosiderin is a cell Fe storage protein and protein coat of ferritin is a hollow sphere of 24 polypeptide chains.

Which of the following are examples of iron-sulphur proteins?

  1. Rubredoxin
  2. Methane monooxygenase
  3. Rieske proteins
  4. Aconitase

  1. 1 and 2

  2. 1, 2 and 3

  3. 1, 3 and 4

  4. 2 and 3

  5. 2, 3 and 4

Show answer
Correct Option: C
Explanation:

This option is correct because rubredoxin is a small iron-sulphur protein found in various sulphur-metabolising bacteria.

Match the following:

 
Column – I Column – II
A. Chloramphenicol 1. Protein synthesis
B. Rifampin 2. RNA synthesis
C. Sulphadiazine 3. Folate synthesis
D. Vancomycin 4. Cell wall synthesis

  1. A - 1, B - 2, C - 3, D - 4

  2. A - 1, B - 3, C - 2, D - 4

  3. A - 2, B - 1, C - 4, D - 3

  4. A - 2, B - 3, C - 4, D - 1

  5. A - 3, B - 4, C - 2, D - 1

Show answer
Correct Option: A
Explanation:

Correct matching is A - 1, B - 2, C - 3, D - 4.

Which of the following tests is used to determine the amino acid sequence of a protein?

  1. Xanthoproteic reaction

  2. Millon’s test

  3. Hopkins-Cole test

  4. Edman’s reaction

  5. Hippuric acid test

Show answer
Correct Option: D
Explanation:

This option is correct because Edman’s reaction can be used to determine the amino acid sequence of a protein.

Match the following:

 
Group I Group II
(P) Tyrosine (1) Threonine
(Q) Serine (2) Phenylalanine
(R) Isoleucine (3) Glutamate
(S) Proline (4) Glycerate 3-phosphate

  1. P - 1, Q - 2, R - 3, S - 4

  2. P - 2, Q - 4, R - 1, S - 3

  3. P - 2, Q - 3, R - 1, S - 4

  4. P - 3, Q - 2, R - 1, S - 4

  5. P - 4, Q - 2, R - 3, S - 1

Show answer
Correct Option: B
Explanation:

This option is correct.

Which of the following statements are incorrect?

  1. All transferrins are lipoproteins.
  2. The transport of iron from storage sites in cellular ferritin or hemosiderin occurs via serum-transport protein transferrin.
  3. Each transferrin binds with only one iron atom.
  4. The protein coat of ferritin is a hollow sphere of 24 polypeptide chains.

  1. 1 and 2

  2. 1 and 3

  3. 1 and 4

  4. 2 and 3

  5. 3 and 4

Show answer
Correct Option: B
Explanation:

This option is correct because all transferrins are glycoproteins and have a high molecular weight, they bind with two iron atoms.

CD 8 is a transmembrane glycoprotein present in

  1. cytotoxic T cells
  2. helper T cells
  3. suppressor T cells

  1. Only 1

  2. Only 2

  3. Only 3

  4. 1 and 2

  5. 2 and 3

Show answer
Correct Option: C
Explanation:

This option is correct because CD 8 is a transmembrane glycoprotein present in suppressor T cells.

Match the entries:

 
Column I Column II
P. Haemoglobin 1. Scleroprotein
Q. Keratin 2. Nucleoprotein
R. Telomerase 3. Chromoprotein

  1. P - 1, Q - 2, R - 3

  2. P - 3, Q - 1, R - 2

  3. P - 2, Q - 1, R - 3

  4. P - 2, Q - 3, R - 1

  5. P - 1, Q - 3, R - 2

Show answer
Correct Option: B
Explanation:

This option is correct because all are correctly matched. Haemoglobin is an example of chromoproteins. Keratin is an example of scleroproteins (fibrous proteins). Telomerase is a ribonucleoprotein.

Which of the following is a pair of cell Fe storage proteins?

  1. Haemoglobin and myoglobin

  2. Transferrin and ferritin

  3. Ferritin and haemosiderin

  4. Haemosiderin and cytochrome c

  5. Cytochrome C and haemoglobin

Show answer
Correct Option: C
Explanation:

This option is correct because ferritin and haemosiderin are cell Fe storage proteins.

Match the entries:

 
Column I Column II
P. Urease 1. 5.0
Q. Haemoglobin 2. 6.8
R. Chymotrypsinogen 3. 9.5
S. Lysozyme 4. 11.0

  1. P - 1; Q - 2; R - 3; S - 4

  2. P - 2; Q - 1; R - 3; S - 2

  3. P - 3; Q - 2; R - 4; S - 1

  4. P - 3; Q - 2; R - 1; S - 4

  5. P - 4; Q - 3; R - 2; S - 1

Show answer
Correct Option: A
Explanation:

This option is correct.

Match the entries:

 
Column I Column II
P. Immunoglobulin G 1. Haemoprotein
Q. Casein 2. Flavoprotein
R. Succinate dehydrogenase 3. Phosphoprotein
S. Haemoglobin 4. Glycoprotein

  1. P - 1; Q - 2; R - 3; S - 4

  2. P - 3; Q - 1; R - 4; S - 2

  3. P - 4; Q - 2; R - 3; S - 1

  4. P - 4; Q - 2; R - 1; S - 3

  5. P - 4; Q - 3; R - 2; S - 1

Show answer
Correct Option: E
Explanation:

This option is correct.

Which of the following enzymes contain both zinc and calcium ions?

P. Alcohol dehydrogenase Q. Neutral protease R. DNA polymerase S. α-Amylase

  1. P and Q

  2. P and R

  3. Q and R

  4. Q and S

  5. R and S

Show answer
Correct Option: D
Explanation:

This option is correct because neutral protease and α-amylase contain zinc (Zn2+) and calcium (Ca2+) ions.

Match the following:

   
Fe containing Protein Function Oxidation state of Fe
P. Haemoglobin i. Plasma O2 transport a. 2
Q. Myoglobin ii. Muscle O2 storage b. 3
R. Transferrin iii. Plasma Fe transport
S. Catalase iv. H2O2 metabolism

  1. P - ii - a, Q - iv - b, R - i - b, S - iii - b

  2. P - iii - a, Q - iv - a, R - ii - b, S - i - b

  3. P - i - a, Q - ii - a, R - iii - b, S - iv - a

  4. P - ii - b, Q - iii - b, R - iv - a, S - i - a

  5. P - i - b, Q - iii - b, R - ii - a, S - iv - b

Show answer
Correct Option: C
Explanation:

Correct matching is P - i - a, Q - ii - a, R - iii - b, S - iv - a.

In which of the following iron-containing proteins is iron in fractional oxidation state?

  1. Myoglobin

  2. Transferrin

  3. Ferritin

  4. Haemosiderin

  5. Cytochrome C

Show answer
Correct Option: E
Explanation:

This option is correct because oxidation state of iron in cytochrome C is 2/3.

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