The Graph Shows the Rate of Catalysis Versus PH for an Enzyme-Catalyzed

question 32

Multiple Choice

The graph shows the rate of catalysis versus pH for an enzyme-catalyzed reaction.What conclusion can be made from the graph?

• A)The enzyme is completely denatured by pHs greater than 8 or less than 5.
• B)The substrate has four ionizable groups.
• C)At pH 6.2 all ionizable groups in the active site are protonated.
• D)The enzyme has an acidic and a basic amino acid in the active site.
• E)The enzyme has only one protonatable residue in the active site.

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Definitions:

Hypothalamus

A region of the brain below the thalamus, coordinating both the autonomic nervous system and the activity of the pituitary, controlling body temperature, hunger, thirst, and other processes that regulate body equilibrium.

Hunger Signals

Physiological cues sent by the body to indicate the need for food intake, involving hormones, the central nervous system, and other bodily mechanisms.

Satiety Signals

Internal biological signals sent by the body to indicate fullness and control food intake.

Neurons

Specialized cells in the nervous system that transmit information to other nerve cells, muscle, or gland cells, through electrical and chemical signals.