Identify the labelings i, ii , and iii in the hemoglobin-oxygen dissociation curve .

Options

A. i. Binding of 1st oxygen molecule (difficult to bind).
ii. Binding of 3rd oxygen molecule (easy to bind)
iii. Binding of 2nd oxygen molecules (very difficult to bind).
B. i. Binding of 1st oxygen molecule (easy to bind).
ii. Binding of 2nd oxygen molecules (easy to bind).
iii. Binding of 3rd oxygen molecule (very difficult to bind)
C. i. Binding of 1st oxygen molecule (easy to bind).
ii. Binding of 2nd oxygen molecules ( difficult to bind).
iii. Binding of 3rd oxygen molecule (difficult to bind)
D. i. Binding of 1st oxygen molecule (difficult o bind)
ii. Binding of 2nd oxygen molecules (easy to bind).
iii. Binding of 3rd oxygen molecule (very difficult to bind)

Answer

D