Select the true statement

Co-operative binding is present in hemoglobin, not in myoglobin

Co-operative binding is present in both hemoglobin and myoglobin

Quarternary structure is present in myoglobin not in hemoglobin

Bohr effect is present in myoglobin not in hemoglobin

Myoglobin - High Yield Topic Series

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| By Kar

Kar, Assistant Professor (Biochemistry)

Karthikeyan Pethusamy is an assistant professor in the Department of Biochemistry at the All India Institute of Medical Sciences in New Delhi

Quizzes Created: 33 | Total Attempts: 47,807

Questions: 5 | Attempts: 236 | Updated: Mar 21, 2023

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Questions and Answers

1.

Number of Haem molecule(s) in myoglobin, number of subunit(s) in myoglobin and number of oxygen molecule(s) carried by myglobin are _________ respectively
- A.
  
  2,3,1
- B.
  
  1,1,1
- C.
  
  1,1,3
- D.
  
  3,1,2
Correct Answer
B. 1,1,1

Explanation
Myoglobin is a protein found in muscle tissues that binds and stores oxygen. It consists of a single polypeptide chain, which means it has only one subunit. Each myoglobin molecule can bind to only one molecule of oxygen, hence the number of oxygen molecules carried by myoglobin is 1. Therefore, the correct answer is 1,1,1.

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2.

Shape of oxygen dissociation curve of Myoglobin
- A.
  
  Hyperbola
- B.
  
  Parbolia
- C.
  
  Sigmoid
- D.
  
  Linear
Correct Answer
A. Hyperbola

Explanation
The shape of the oxygen dissociation curve of myoglobin is hyperbola. This is because myoglobin has a high affinity for oxygen at low partial pressures, meaning it binds to oxygen strongly in environments with low oxygen levels. As the partial pressure of oxygen increases, myoglobin becomes saturated with oxygen and its binding capacity decreases. This results in a hyperbolic curve, where the rate of oxygen binding slows down as the oxygen concentration increases.

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3.

Function of myoglobin is
- A.
  
  Oxygen carrier
- B.
  
  Oxygen reservoir
- C.
  
  Anti-oxidant
- D.
  
  None of the above
Correct Answer
B. Oxygen reservoir

Explanation
Myoglobin acts as an oxygen reservoir in muscle tissues. It stores oxygen molecules and releases them when needed during periods of low oxygen availability. This allows muscles to continue functioning properly even in oxygen-deprived conditions. Myoglobin has a higher affinity for oxygen than hemoglobin, making it a more efficient oxygen storage molecule. Its role as an oxygen reservoir helps to ensure an adequate oxygen supply to the muscles, especially during intense physical activity.

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4.

Myoglobin has high affinity for oxygen
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
Myoglobin is a protein found in muscle tissues that has a high affinity for oxygen. This means that it readily binds to oxygen molecules and holds onto them tightly. This allows myoglobin to efficiently transport and store oxygen in muscle cells, ensuring an adequate oxygen supply for muscle contraction and metabolism. Therefore, the statement "Myoglobin has high affinity for oxygen" is true.

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5.

Select the true statement
- A.
  
  Co-operative binding is present in hemoglobin, not in myoglobin
- B.
  
  Co-operative binding is present in both hemoglobin and myoglobin
- C.
  
  Quarternary structure is present in myoglobin not in hemoglobin
- D.
  
  Bohr effect is present in myoglobin not in hemoglobin
Correct Answer
A. Co-operative binding is present in hemoglobin, not in myoglobin

Explanation
The explanation for the given correct answer is that cooperative binding refers to the phenomenon where the binding of one molecule of a ligand to a protein increases the affinity of the remaining binding sites for the same ligand. Hemoglobin exhibits cooperative binding, where the binding of oxygen to one subunit of the protein increases the affinity of the remaining subunits for oxygen. This allows hemoglobin to efficiently pick up oxygen in the lungs and release it in the tissues. On the other hand, myoglobin does not exhibit cooperative binding as it only has one subunit and does not undergo conformational changes upon oxygen binding.

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Current Version
Mar 21, 2023

Quiz Edited by
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Apr 26, 2012

Quiz Created by
Kar

Myoglobin - High Yield Topic Series

Number of Haem molecule(s) in myoglobin, number of subunit(s) in myoglobin and number of oxygen molecule(s) carried by myglobin are _________ respectively

Shape of oxygen dissociation curve of Myoglobin

Function of myoglobin is

Myoglobin has high affinity for oxygen

Select the true statement