3. for each enzyme in model 1, circle the ph that best represents the environment in which the enzyme is most active.
pepsin 1.5 8 10.4
lipase 1.5 8 10.4
4. compare the rate of the pepsin - catalyzed reaction at ph 1.5 with the rate of the lipase - catalyzed reaction at ph 1.5.
5. compare the rate of the pepsin - catalyzed reaction at ph 8 with the rate of the lipase - catalyzed reaction at ph 8.
6. using your knowledge of protein structure, explain in detail the effect of exposing an enzyme to a ph outside of its optimal range. include the effect on both enzyme structure and function.
7. at what ph values is lipase likely to be denatured? justify your answer.
8. at what ph values is pepsin likely to be denatured? justify your answer.
9. in addition to being produced in the pancreas, lipase is also produced in the stomach. is the structure of pancreatic lipase the same as gastric (produced in the stomach) lipase? justify your reasoning.
10. add a line to the graph in model 1 that shows a prediction for gastric lipase activity.
11. antacids work by neutralizing acids, bringing the ph of the stomach to a range of 6 - 7. what is the effect of taking an antacid on a persons ability to digest proteins?

Question

Accepted Answer

### 3.
Pepsin is most active at pH 1.5 as it functions in the acidic environment of the stomach. Lipase is most active at pH 8 as it functions in the more - alkaline environment of the small intestine.

### 4.
# Explanation:
## Step1: Pepsin optimal pH
Pepsin has an optimal pH of 1.5. At this pH, the pepsin - catalyzed reaction rate is high as it is in its optimal environment.
## Step2: Lipase at pH 1.5
Lipase has an optimal pH around 8. At pH 1.5, the lipase - catalyzed reaction rate is low because this pH is outside of its optimal range.
# Answer:
The rate of the pepsin - catalyzed reaction at pH 1.5 is higher than the rate of the lipase - catalyzed reaction at pH 1.5.

### 5.
# Explanation:
## Step1: Pepsin at pH 8
Pepsin has an optimal pH of 1.5. At pH 8, the pepsin - catalyzed reaction rate is low as this pH is outside of its optimal range.
## Step2: Lipase at pH 8
Lipase has an optimal pH around 8. At pH 8, the lipase - catalyzed reaction rate is high as it is in its optimal environment.
# Answer:
The rate of the lipase - catalyzed reaction at pH 8 is higher than the rate of the pepsin - catalyzed reaction at pH 8.

### 6.
# Brief Explanations:
Enzymes are proteins. When exposed to a pH outside of their optimal range, the ionic and hydrogen bonds that maintain the protein's tertiary and quaternary structures are disrupted. This leads to denaturation, where the enzyme loses its three - dimensional shape. Since the enzyme's function depends on its shape (specifically the active site shape for substrate binding), a denatured enzyme has a reduced or non - existent ability to catalyze reactions.
# Answer:
Exposing an enzyme to a pH outside of its optimal range can cause denaturation. The disruption of ionic and hydrogen bonds in the protein structure changes the shape of the enzyme, especially the active site. This impairs the enzyme's ability to bind to its substrate and catalyze reactions effectively.

### 7.
# Brief Explanations:
Lipase has an optimal pH around 8. It is likely to be denatured at pH values far from 8, such as very acidic pH values like pH 1.5 and very basic pH values (e.g., pH values above 10). Extreme pH values disrupt the enzyme's structure.
# Answer:
Lipase is likely to be denatured at pH values much lower than 8 (e.g., pH 1.5) and much higher than 8 (e.g., pH 10.4) because these pH values disrupt the ionic and hydrogen bonds that maintain its protein structure.

### 8.
# Brief Explanations:
Pepsin has an optimal pH of 1.5. It is likely to be denatured at pH values far from 1.5, such as neutral (pH 7) and basic pH values (e.g., pH 8 and 10.4). These pH values disrupt the bonds in its protein structure.
# Answer:
Pepsin is likely to be denatured at pH values much higher than 1.5, such as pH 8 and 10.4, because these pH values disrupt the ionic and hydrogen bonds that maintain its protein structure.

### 9.
# Brief Explanations:
The structure of pancreatic lipase and gastric lipase is likely different. They are produced in different environments (alkaline pancreas and acidic stomach) and may have evolved to function optimally in those respective environments. Different amino - acid sequences and post - translational modifications could lead to different structures.
# Answer:
The structure of pancreatic lipase is likely not the same as gastric lipase. They are produced in different environments with different pH levels, and their structures may have adapted to function optimally in those environments.

### 10.
Since gastric lipase is produced in the stomach, it is likely to have an optimal pH in the acidic range, similar to the acidic environment of the stomach (around pH 1.5 - 3). The line for gastric lipase activity in the graph would show high activity in the acidic pH range and a decrease in activity as the pH moves towards neutral and basic values.

### 11.
# Explanation:
## Step1: Pepsin and stomach pH
Pepsin, which is important for protein digestion in the stomach, has an optimal pH of 1.5.
## Step2: Antacid effect on pH
Antacids raise the stomach pH to 6 - 7. This is outside of pepsin's optimal range.
## Step3: Effect on protein digestion
Pepsin will be less active or denatured at this higher pH, reducing the ability to digest proteins.
# Answer:
Taking an antacid reduces a person's ability to digest proteins because pepsin, which is crucial for protein digestion in the stomach, is less active or denatured at the higher pH (6 - 7) caused by the antacid, compared to its optimal pH of 1.5.

Sovi.AI - AI Math Tutor

QUESTION IMAGE

Question

Explanation:

3.

4.

Step1: Pepsin optimal pH

Step2: Lipase at pH 1.5

Step1: Pepsin at pH 8

Step2: Lipase at pH 8

Answer:

5.