Which of the following statements is not true about enzymes?

They raise the activation energy needed

Where is the apical side of an epithelial cell located?

Does not allow any substances to pass through

HESI A2 Exam Biology Questions

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Question 1

Enzymes can ................. reactions.

Your Answer: Option(s)

Correct Answer: Option(s) A

Rationale

Enzymes can catalyze reactions.

Enzymes function as biological catalysts that accelerate chemical reactions by lowering the activation energy required for the reaction to proceed. This catalytic activity is essential for various physiological processes, as enzymes enable reactions to occur at rates suitable for life.

A) Catalyze
Enzymes are specifically designed to catalyze reactions, meaning they increase the rate at which these reactions occur without being consumed in the process. This property is crucial in biological systems, where many reactions would proceed too slowly to sustain life without enzymatic intervention.

B) Inhibit
While enzymes can be inhibited by certain molecules that reduce their activity, the term "inhibit" does not accurately describe the primary function of enzymes. Inhibition refers to the decrease in enzyme activity rather than the standard role of enzymes, which is to facilitate or catalyze reactions.

C) Stop
Enzymes do not stop reactions; rather, they enhance their speed. Stopping a reaction typically involves the presence of inhibitors or other regulatory mechanisms, which is not the inherent function of enzymes. Thus, this choice misrepresents the active role of enzymes in facilitating reactions.

D) None of the above
This option is inaccurate as it suggests that enzymes do not have a defined role in reactions, which contradicts the established understanding of enzyme function as catalysts. Since enzymes are integral to catalyzing reactions, this choice is incorrect.

Conclusion
Enzymes are essential catalysts in biological systems, specifically designed to catalyze chemical reactions by lowering activation energy. While they can be inhibited or affected by various factors, their primary purpose is to facilitate and accelerate reactions, which is vital for maintaining life processes. Recognizing the catalytic role of enzymes is fundamental to understanding biochemical pathways and metabolic regulation.

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Enzymes can catalyze reactions.

Enzymes are typically proteins.

Enzymes lower the activation energy needed for reactions.

Epithelial cells are polarized.

The apical side of an epithelial cell is on the top side of the cell.

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Enzymes can catalyze reactions.

Enzymes are typically proteins.

Enzymes lower the activation energy needed for reactions.

Epithelial cells are polarized.

The apical side of an epithelial cell is on the top side of the cell.

Free Preview Ended

Unlock Full Access

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