Which Statement About the Binding of Oxygen by Hemoglobin Is

question 93

Multiple Choice

Which statement about the binding of oxygen by hemoglobin is true?

• A) The percentage of completely O₂-saturated hemoglobin decreases as PO₂ increases.
• B) The O₂-binding/dissociation curve is U-shaped.
• C) Over the full length of the O₂-binding/dissociation curve, O₂ dissociation-association is rapid.
• D) A very low PO₂ is required for all four hemoglobin subunits to bind to O₂.
• E) Once one subunit of hemoglobin binds to O₂, the affinity of the remaining subunits for their O₂ increases until three O₂ are bound.

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Definitions:

Sex Chromosome

A type of chromosome involved in determining the sex of an organism, typically referred to as X or Y chromosomes in many species.

Male

Refers to the sex that is typically associated with the production of small gametes or sperm in the context of sexual reproduction.

Female

Pertaining to the sex that is typically characterized by the production of ova (eggs) and, in many species, by having two X chromosomes.

Pyrimidines

One of the two types of nitrogenous bases found in nucleic acids, including cytosine, thymine (in DNA), and uracil (in RNA).