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 28

A treatment process uses an enzyme to break down substance X in wastewater. The reaction produces a gas.

A scientist mixes a fixed volume and concentration of the enzyme with different concentrations of substance X. The scientist records the volume of gas produced in 40 s.

The temperature, pH and total volume of the reaction mixture are kept constant.

Concentration of substance X in $%\%$	Volume of gas produced in 40 s in $cm3\mathrm{cm^3}$
0.5	8
1.0	15
2.0	24
4.0	28
8.0	28

Calculate the rate of gas production at a concentration of 8.0% of substance X.

Give your answer in $s−1\mathrm{cm^3\,s^{-1}}$ .

[2]

Explain the pattern in the results as the concentration of substance X increases from 0.5% to 8.0%.

[3]

The scientist repeats the test using 8.0% substance X but doubles the concentration of the enzyme. Substance X remains in excess.

Predict how the volume of gas produced in 40 s will compare with 28 cm³. Explain your answer.

[2]

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

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

Question 28

A treatment process uses an enzyme to break down substance X in wastewater. The reaction produces a gas.

A scientist mixes a fixed volume and concentration of the enzyme with different concentrations of substance X. The scientist records the volume of gas produced in 40 s.

The temperature, pH and total volume of the reaction mixture are kept constant.

Concentration of substance X in $%\%$	Volume of gas produced in 40 s in $cm3\mathrm{cm^3}$
0.5	8
1.0	15
2.0	24
4.0	28
8.0	28

Calculate the rate of gas production at a concentration of 8.0% of substance X.

Give your answer in $s−1\mathrm{cm^3\,s^{-1}}$ .

[2]

Explain the pattern in the results as the concentration of substance X increases from 0.5% to 8.0%.

[3]

The scientist repeats the test using 8.0% substance X but doubles the concentration of the enzyme. Substance X remains in excess.

Predict how the volume of gas produced in 40 s will compare with 28 cm³. Explain your answer.

[2]

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

Question 28

Markscheme

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

Question 28

Markscheme

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

Question 28

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

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

Question 28

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