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Types of Proteins (GATE)

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Questions

Question 1 Multiple Choice (Single Answer)

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
Question 2 Multiple Choice (Single Answer)

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
Question 3 Multiple Choice (Single Answer)

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
Question 4 Multiple Choice (Single Answer)

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
Question 5 Multiple Choice (Single Answer)

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
Question 6 Multiple Choice (Single Answer)

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
Question 7 Multiple Choice (Single Answer)

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
Question 8 Multiple Choice (Single Answer)

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
Question 9 Multiple Choice (Single Answer)

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
Question 10 Multiple Choice (Single Answer)

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
Question 11 Multiple Choice (Single Answer)

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
Question 12 Multiple Choice (Single Answer)

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
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