In Sickle-Cell Anemia Hemoglobin

question 70

Multiple Choice

In sickle-cell anemia hemoglobin

• A) the four subunits of hemoglobin dissociate from one another
• B) the heme group is lost from all subunits
• C) the iron is in the Fe(III) form rather than the normal Fe(II)
• D) groups of hemoglobin molecules aggregate with each other

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Definitions:

Enzymes

Enzymes are biological molecules, typically proteins, that significantly speed up the rate of virtually all chemical reactions within cells without being consumed by those reactions.

Substrate

In biochemistry, the reactant that an enzyme acts upon to catalyze a chemical reaction.

Pepsin

An enzyme in the stomach that breaks down proteins into smaller peptides, facilitating digestion.

Denature

A process in which proteins lose their native shape and functionality due to the disruption of non-covalent bonds, often caused by changes in pH, temperature, or chemical exposure.