Question

19.pepsin is an enzyme that functions best in your stomach which is very acidic. what ph would be the optimum ph for pepsin to work?
2
7
10
14
20.a high substrate concentration means ____________ substrate for the enzyme to act on.
21.a low substrate concentration means ____________ substrate for the enzyme to act on.
the enzymatic machine:
your job is to make the machine run at an optimal rate. the faster, the better.
22.the temperature should be __________, the ph should be ________, the substrate concentration should be __________.
watch your machine work until a yellow button appears, click my observation is complete
answer the following questions.
you can check your work by clicking the quiz button on the menu.
23.which graph above best shows the relationship between the reaction rate of enzyme - catalyzed reaction and substrate concentration? ____________
24.which graph above best shows the relationship between the reaction rate of enzyme - catalyzed reaction and temperature? ____________

Explanation:

1. Pepsin functions best in an acidic environment. The stomach is acidic with a pH around 2, which is the optimal pH for pepsin.
2. A high substrate concentration means more substrate for the enzyme to act on.
3. A low substrate concentration means less substrate for the enzyme to act on.
4. Enzymes generally have an optimal temperature (usually around body - temperature for human enzymes), an optimal pH (which varies by enzyme, but for many enzymes in the body it can be around neutral or slightly acidic/alkaline), and a high substrate concentration is beneficial for maximum reaction rate.
5. The relationship between the reaction rate of an enzyme - catalyzed reaction and substrate concentration is that the rate increases with increasing substrate concentration until it reaches a maximum (saturation point), which is shown in graph B.
6. The relationship between the reaction rate of an enzyme - catalyzed reaction and temperature is that the rate increases with increasing temperature until the optimal temperature is reached, after which the rate decreases due to enzyme denaturation, which is shown in graph A.

Answer:

1. 2
2. more
3. less
4. optimal temperature; optimal pH; high
5. B
6. A