Equal masses of fat are mixed with equal lipase concentrations at 37 °C. A has large droplets at pH 3; B has large droplets at pH 8; C has small droplets at pH 8. This lipase works best near pH 8.
.1
Explain why B should digest fat faster than A.
[2 marks]
.2
Explain why C should be faster than B and relate this to bile.
[2 marks]
5 marksFoundation and Higher4.1.2.2 Mitosis and the cell cycle
AQA Trilogy 8464
Spec and skills
Paper scope: B1
Spec 4.1.2.2
Original practice question
Answer and supported method checks
A student says: "DNA is copied after mitosis because daughter cells only need half the genetic information at first."
.1
Explain why this account is incorrect.
[3 marks]
.2
Explain why mitosis is useful in healing a skin wound.
[2 marks]
4 marksFoundation and Higher4.2.2.5 Health issues
AQA Trilogy 8464
Spec and skills
Paper scope: B1
Spec 4.2.2.5
Original practice question
Answer and supported method checks
A virus damages immune cells. Patients later get frequent infections from other pathogens. Long illness prevents some patients from working or meeting friends.
.1
Explain why other infections become more frequent.
[2 marks]
.2
Suggest two links between long illness and poorer mental health.
[2 marks]
6 marksFoundation and HigherRequired practical 054.4.1.2 Rate of photosynthesis
AQA Trilogy 8464
Spec and skills
Paper scope: B1
Spec 4.4.1.2
Original practice question
Answer and supported method checks
A class plans to investigate how light intensity affects photosynthesis using pondweed, a lamp, a ruler, a water bath and a gas-collection syringe.
Plan an investigation that produces valid, repeatable rate comparisons.
[6 marks]
6 marksHigher4.3.1.7 Vaccination
AQA Trilogy 8464
Spec and skills
Paper scope: B1
Spec 4.3.1.7
Original practice question
Answer and supported method checks
A town offers a vaccine against a serious droplet-spread disease. Some residents cannot receive it for medical reasons. A group argues that vaccination is purely an individual choice with no effect on other people.
Evaluate the group's claim using vaccination and transmission.
