quiz 22

Question 1

Give one way the results in the investigation to the effect of pH on rate of amalyse action may not be accurate

Answer 1

It may be difficult to determine the exact time the colour of iodine stays reddish-orange

Question 2

In an investigation to test the effect of pH on the rate of reaction of amalyse enzyme, what is the independent variable

Answer 2

pH

Question 3

Iodine is added to a beaker containing starch and amylase at pH 2. It is left to stand for 10 minutes. Explain the expected outcome

Answer 3

The iodine turns black as not enough starch molecules are broken down due to amylase getting denatured

Question 4

Give one way the investigation into the effect of pH on rate of amylase action could be improved to get accurate results

Answer 4

Reduce the time between samples from 30 seconds to 10 seconds

Question 5

In an investigation to test the effect of pH on the rate of reaction of amylase enzyme, what is the dependent variable?

Answer 5

Rate of reaction of amalyse

Question 6

Iodine is added to a beaker containing starch and amylase at pH 7. It is left to stand for 10 minutes. Explain the expected outcome

Answer 6

The iodine remains reddish-orange as most of the starch molecules are broken down by amylase

Question 7

What is the optimum pH of amylase action?

Answer 7

7

Question 8

In an investigation to test the effect of pH on the rate of reaction of amylase enzyme, what are control variables?

Answer 8

concentration of amylase, concentration of substrate and temperature of enzyme

Question 9

Iodine is added to a beaker containing starch and amylase at pH 11. It is left to stand for 10 minutes. Explain the expected outcome

Answer 9

The iodine turns black as not enough starch molecules are broken down due to the amylase getting denatured