Question 1
Paper 2Easy6 marksA student exposes equal samples of the same enzyme to different conditions for 10 minutes. The student then measures the activity of each sample at pH 7 and 25 °C.
| Conditions during exposure | Relative enzyme activity afterwards (% of untreated control) |
|---|---|
| pH 7, 25 °C (untreated control) | 100 |
| pH 7, 80 °C | 8 |
| pH 2, 25 °C | 12 |
(a)[3]
State three features of polypeptide chains that allow a wide variety of polypeptides to exist.
(b)
Use the results in the table.
(i)[1]
Identify the exposure condition that resulted in the lowest enzyme activity.
(ii)[2]
State the term for the change in protein structure that can be caused by high temperature or extreme pH, and state one effect of this change on enzyme function.