System Physiology - Animal-Respiratory System [CSIR (Council of Scientific & Industrial Research) Life Sciences]: Questions 1 - 2 of 6

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Question 1

Appeared in Year: 2018

Question MCQ▾

The oxygen-haemoglobin dissociation curve illustrates the relationship between pO2 in blood and the number of molecules bound to haemoglobin. The ‘S’ shape of the curve has been explained in the following proposed statements. (December)

1. The quaternary structure of haemoglobin determines its affinity to .

2. In deoxy haemoglobin, the globin unit s are tightly bound in a T-configuration.

3. The interactions between globin subunits are altered when binds with deoxy haemoglobin.

4. The affinity to in T-configuration of haemoglobin is increased

5. In the relaxed configuration of haemoglobin, the affinity to is reduced.

Choose one of the following combinations with both INCORRECT statements:

Choices

Choice (4)Response

a.

4 and 5

b.

2 and 3

c.

1 and 2

d.

3 and 4

Edit

Question 2

Appeared in Year: 2019

Question MCQ▾

The dissociation curves of oxygenated and deoxygenated blood are given along with dissolved below: Following are the statements deduced from the curves above and/or based on the knowledge about transport,

Which may or may not be correct: (June)

1. The deoxygenated haemoglobin has greater affinity for than oxygenated haemoglobin.

2. The deoxygenated haemoglobin does not bind with free H + ions released during the formation of - from .

3. The haemoglobin saturation with O2 has no effect on dissociation curve.

4. and bind to haemoglobin at different sites.

Which one of the following options represents a combination of all correct statements?

Choices

Choice (4)Response

a.

1 and 4

b.

3 and 4

c.

1 and 2

d.

2 and 3

Edit