Reversible Binding of a Protein to a Ligand: Oxygen-Binding Proteins MCQ

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When oxygen binds to a heme-containing protein, the two open coordination bonds of Fe2+ are occupied by___________

ক
One O atom and one amino acid atom

খ
One O2 molecule and one amino acid atom

গ
One O2 molecule and one heme atom

ঘ
Two O atoms
The interactions of ligands with proteins are ___________

ক
Relatively nonspecific

খ
Relatively rare in biological systems

গ
Usually irreversible

ঘ
Usually transient
Myoglobin and the subunits of hemoglobin have ___________

ক
Very different primary and tertiary structures

খ
Very similar primary and tertiary structures

গ
Very similar primary structures, but different tertiary structures

ঘ
Very similar tertiary structures, but different primary structures
In the binding of oxygen to myoglobin, the relationship between the concentration of oxygen and the fraction of binding sites occupied can best be described as ___________

ক
Hyperbolic

খ
Linear with a negative slope

গ
Linear with a positive slope

ঘ
Parabolic
Myoglobin binding of O2 depends on ___________

ক
Hemoglobin concentration

খ
O2 concentration and affinity of myoglobin for O2

গ
Ka

ঘ
Kd
Which of the following is a correct relation? = ⁄ b) Kd = ⁄ c) Kd = × d) Kd = ⁄

ক
Kd = ⁄

খ
L

গ
L

ঘ
L
Which of the following is a correct relation? = ⁄ b) Ka = ⁄ c) Ka = × d) Ka = ⁄

ক
Ka = ⁄

খ
L

গ
L

ঘ
L
His93 is also called ________

ক
His F8

খ
His F7

গ
His F6

ঘ
His F5
Myoglobin is particularly abundant in ________

ক
Nerves

খ
Muscles

গ
Blood cells

ঘ
Skin