Gaseous Exchange 2

Which protein has high affinity towards oxygen?

• Insulin

• Collagen

• Haemoglobin

• Myoglobin

Answer explanation

Haemoglobin has high affinity towards oxygen, allowing it to efficiently transport oxygen in the blood.

What happens to the percentage of oxygen saturation as PO2 increases for haemoglobin?

• Remains constant

• Decreases

• Increases

• Fluctuates

Answer explanation

As PO2 increases, the percentage of oxygen saturation for haemoglobin increases. This is due to the higher affinity of haemoglobin for oxygen at higher partial pressures of oxygen.

How many oxygen molecules can one myoglobin bind with?

• Three

• Two

• One

• Four

Answer explanation

Myoglobin can bind with one oxygen molecule, making the correct answer choice 'One'.

Where does myoglobin store O2?

• Liver

• Brain

• Heart

• Skeletal muscle

Answer explanation

Myoglobin stores O2 in skeletal muscle, not in the liver, brain, or heart.

At what PO2 does myoglobin release O2?

• Low

• Very low

• Medium

• High

Answer explanation

Myoglobin releases O2 at a very low PO2, making the correct answer choice 'Very low'.

Which protein exhibits cooperative binding of oxygen?

• Haemoglobin

• Actin

• Myoglobin

• Keratin

Answer explanation

Haemoglobin exhibits cooperative binding of oxygen, allowing it to efficiently transport oxygen in the blood.

What shape is the oxygen dissociation curve for myoglobin?

• Linear

• Exponential

• Parabolic

• Hyperbolic

Answer explanation

The correct shape of the oxygen dissociation curve for myoglobin is hyperbolic, not linear, exponential, or parabolic.

What happens to the oxygen dissociation curve for myoglobin compared to haemoglobin?

• Shifts to the left

• Becomes steeper

• Remains the same

• Shifts to the right

Answer explanation

Myoglobin has a higher affinity for oxygen than hemoglobin, causing the oxygen dissociation curve to shift to the left, indicating increased oxygen binding at lower partial pressures.

Does myoglobin exhibit cooperative binding of oxygen?

• No

• Sometimes

• Yes

• Depends

Answer explanation

Myoglobin does not exhibit cooperative binding of oxygen, therefore the correct answer is 'No'.

At what grade level is this quiz suitable for?

• Grade 8

• Grade 10

• Grade 12

• College

Answer explanation

The quiz is suitable for Grade 12 because it is the correct answer choice provided.