Question

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excerpt 1
enzymes make life as we know it possible. without enzymes, it would take years to build up the energy required to complete even a simple activity. for example, your saliva contains an enzyme called amylase that breaks starch into simple sugars, which then get converted into glucose by other enzymes and used for energy. without the right enzymes, much of the food you eat would pass through you without being absorbed. enzymes catalyze biochemical reactions by lowering the amount of energy needed for a chemical reaction to take place. importantly, enzymes are able to increases the rate of a chemical reaction without being consumed or permanently changed. thanks to enzymes, the countless biochemical reactions that take place inside your body occur at fractions of seconds instead of years.

excerpt 2
choose the correct answer from each drop-down menu to complete the statement.
pepsin functions best at drop-down ph levels; therefore, it is most likely a catalyst in drop-down

Explanation:

To solve this, we analyze the role of enzymes (like pepsin) from the excerpts:

For "Pepsin functions best at [ ] pH levels":

Pepsin is a digestive enzyme in the stomach. The stomach has an acidic environment (low pH, around 1.5–2). So pepsin functions best at acidic pH levels.

For "therefore, it is most likely a catalyst in [ ]":

Enzymes (including pepsin) act as catalysts in biochemical reactions (specifically, digestion of proteins in the stomach). The excerpts explain enzymes catalyze reactions by lowering activation energy, so pepsin is a catalyst in the stomach (where protein digestion occurs).

Final Answers (assuming dropdown options include these):

• Pepsin functions best at: acidic
• therefore, it is most likely a catalyst in: the stomach (or "digestive system" / "protein digestion reactions", context-dependent)

(Note: If specific dropdown options were provided, we’d match to those. The above is based on biological principles from the excerpts about enzymes as catalysts and pepsin’s role in stomach digestion.)

Answer:

To solve this, we analyze the role of enzymes (like pepsin) from the excerpts:

For "Pepsin functions best at [ ] pH levels":

Pepsin is a digestive enzyme in the stomach. The stomach has an acidic environment (low pH, around 1.5–2). So pepsin functions best at acidic pH levels.

For "therefore, it is most likely a catalyst in [ ]":

Enzymes (including pepsin) act as catalysts in biochemical reactions (specifically, digestion of proteins in the stomach). The excerpts explain enzymes catalyze reactions by lowering activation energy, so pepsin is a catalyst in the stomach (where protein digestion occurs).

Final Answers (assuming dropdown options include these):

• Pepsin functions best at: acidic
• therefore, it is most likely a catalyst in: the stomach (or "digestive system" / "protein digestion reactions", context-dependent)

(Note: If specific dropdown options were provided, we’d match to those. The above is based on biological principles from the excerpts about enzymes as catalysts and pepsin’s role in stomach digestion.)