Question

amylase is a digestive enzyme that is present in human saliva and the pancreas. it converts starch into simple sugars. which table must be true about the relative reactivity of amylase?

Explanation:

Step1: Recall enzyme activity and temperature

Enzymes, like amylase, have an optimal temperature range (around human body temp, ~37°C) where activity is highest. Below/above, activity decreases, and at extreme temps, it denatures (activity near 0).

Step2: Analyze each table

• First table: At 37°C, activity is 50. At 84°C (high), activity 95? No, should decrease. Wrong.
• Second table: At 37°C, activity 0? No, body temp is optimal. Wrong.
• Third table: At 37°C, activity 5. At 150°C (very high), activity 20? No, should be low. Wrong.
• Fourth table: Wait, re - check. Wait, first table: Wait, correct logic: Amylase (salivary and pancreatic) works best around 37°C (body temp). So at 37°C, relative reactivity should be high. As temp moves away (lower or higher), reactivity decreases. Let's re - evaluate:

Wait, maybe I misread. Let's check the first table again:

First table:
Temp (°F) | Relative Reactivity
37 | 50
68 | 80
84 | 95
150 | 20
177 | 5
149 | 0
158 | 0

No, that's increasing then decreasing, but 37 is body temp, should be peak.

Second table:
37 | 0
68 | 30
84 | 65
150 | 80
177 | 49
144 | 7
158 | 0

No, 37 is low, 150 is high, wrong.

Third table:
37 | 5
68 | 8
84 | 15
150 | 20
177 | 64
144 | 80
158 | 85

Increasing with temp, wrong (enzymes denature at high temp).

Wait, maybe the first table: Wait, maybe the temperature units? Wait, 37°C is body temp, but the table is in °F? 37°C is about 98.6°F. Wait, maybe the numbers are misread. Wait, the first table: Let's assume that the optimal temp for amylase is around body temp (37°C or ~98°F). So at temp near 37°C, reactivity is high. As temp goes too low or too high, reactivity drops.

Wait, the first table: At 37°F (very cold), reactivity 50; 68°F (cool), 80; 84°F (warm), 95; then 150°F (hot), 20; 177°F (very hot), 5; 149°F, 0; 158°F, 0. So it increases from 37°F to 84°F (approaching optimal temp range), then decreases at higher temps (denaturation). This makes sense: enzymes have an optimal temp range, so as temp increases from a low towards optimal, activity increases; beyond optimal, activity decreases (denaturation). So the first table shows increasing then decreasing, which matches enzyme activity vs temperature (optimal temp in the middle of the range shown, before high temp denaturation).

The other tables: Second table has 37°F with 0 (too low, but then increases to 150°F, which is wrong as high temp should denature). Third table increases with temp (wrong, enzymes denature at high temp). Fourth table has inconsistent pattern. So the first table is correct.

Answer:

The first table (with Temperature (°F) values 37, 68, 84, 150, 177, 149, 158 and corresponding Relative Reactivity 50, 80, 95, 20, 5, 0, 0) is the correct one.