Holooly Plus Logo
Holooly Plus Logo

Question 19.2: Enzymatic activity is shown for three different enzymes as a...

Enzymatic activity is shown for three different enzymes as a function of pH in the graph below. What is the optimum pH for pepsin (curve A), for urease (curve B), and for alanine dehydrogenase (curve C)?

ANALYSIS Recall that the optimum pH is the pH at which the enzyme shows the highest activity; therefore, the highest point on the curve, representing maximum activity, is the optimum pH for the enzyme.

19.2
The blue check mark means that this solution has been answered and checked by an expert. This guarantees that the final answer is accurate.
Learn more on how we answer questions.

Find the correct curve for each enzyme, then find the apex of the activity curve. Drop a vertical line to the pH axis and read the optimum pH directly from the axis scale. The optimum pH for pepsin is approximately 4.0, that for urease approximately 6.0, and that for alanine dehydrogenase approximately 9.5.

Related Answered Questions

Question: 19.4

Look at the three-step pathway for the conversion of 3-phosphoglycerate to serine: 3-phosphoglycerate →^1 3-phosphohydroxypyruvate →^2 3-phosphoserine →^3 serine When the cell has plenty of serine available, which enzyme in the pathway, 1, 2 or 3, is most likely to be inhibited? ANALYSIS This is a ...

Verified Answer:

Assuming that feedback control is the simplest con...
Question: 19.1

To what class does the enzyme that catalyzes the following reaction belong? ...

Verified Answer:

The reaction is a transfer of an amino functional ...
Question: 19.4

Identify the substrate, product, and coenzyme in the reaction shown below. The reaction is catalyzed by the enzyme alcohol dehydrogenase. Ethanol + NAD^+ → Acetaldehyde + NADH + H^+ ANALYSIS Identify which molecules have been changed and how, starting from the left side of the arrow (the beginning ...

Verified Answer:

Since NAD^+ is a coenzyme involved ...
Question: 19.3

Consider the temperature activity curve below. Enzymatic activity is shown for muscle lactate dehydrogenase from 0 °C to 60 °C. Suppose you wish to test a sample for lactate dehydrogenase activity; what is the best temperature for the test? ...

Verified Answer:

From the highest point on the preceding curve of a...