Question bank1.2 What happens in cells (and what do cells need)?

1.2 What happens in cells (and what do cells need)?

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Question 11

Two samples of a human protease are kept for 10 minutes at different temperatures, with no substrate present.

Sample R is kept at $∘C15\ ^\circ\text{C}$ and sample S is kept at $∘C65\ ^\circ\text{C}$ . Both samples are then brought to $∘C37\ ^\circ\text{C}$ before equal amounts of protein are added.

Protein is broken down in sample R but not in sample S.

Which statement explains this?

[1]

Protease in sample S shifted its optimum to $∘C65\ ^\circ\text{C}$ , so $∘C37\ ^\circ\text{C}$ was too cold for it to work.

Protease in sample S kept extra kinetic energy from $∘C65\ ^\circ\text{C}$ , so it moved too fast to bind protein.

Protease in sample R retained its active-site shape, whereas protease in sample S was denatured at $∘C65\ ^\circ\text{C}$ .

Protease in sample S was used up at $∘C65\ ^\circ\text{C}$ , whereas protease in sample R was not used up at $∘C15\ ^\circ\text{C}$ .

Two samples of a human protease are kept for 10 minutes at different temperatures, with no substrate present.

Sample R is kept at $∘C15\ ^\circ\text{C}$ and sample S is kept at $∘C65\ ^\circ\text{C}$ . Both samples are then brought to $∘C37\ ^\circ\text{C}$ before equal amounts of protein are added.

Protein is broken down in sample R but not in sample S.

Which statement explains this?

Protease in sample S shifted its optimum to $∘C65\ ^\circ\text{C}$ , so $∘C37\ ^\circ\text{C}$ was too cold for it to work.

Protease in sample S kept extra kinetic energy from $∘C65\ ^\circ\text{C}$ , so it moved too fast to bind protein.

Protease in sample R retained its active-site shape, whereas protease in sample S was denatured at $∘C65\ ^\circ\text{C}$ .

Protease in sample S was used up at $∘C65\ ^\circ\text{C}$ , whereas protease in sample R was not used up at $∘C15\ ^\circ\text{C}$ .

1.2 What happens in cells (and what do cells need)?

Question 11

Markscheme

1.2 What happens in cells (and what do cells need)?

Question 11

Markscheme

1.2 What happens in cells (and what do cells need)?

Question 11

1.2 What happens in cells (and what do cells need)? Questions

1.2 What happens in cells (and what do cells need)?

Question 11

1.2 What happens in cells (and what do cells need)? Questions