4 marksFoundation and Higher4.5.3.2 Control of blood glucose concentration
AQA Trilogy 8464
Spec and skills
Paper scope: B2
Spec 4.5.3.2
Original practice question
Answer and supported method checks
A person with Type 1 diabetes says that insulin lowers blood glucose because it destroys glucose molecules in the bloodstream.
.1
Explain why this explanation is incorrect.
[2 marks]
.2
Explain why a person with Type 1 diabetes may need insulin treatment even when they avoid sugary foods.
[2 marks]
6 marksHigher4.6.1.5 Inherited disorders
AQA Trilogy 8464
Spec and skills
Paper scope: B2
Spec 4.6.1.5
Original practice question
Answer and supported method checks
Two carriers of cystic fibrosis consider embryo screening. Screening can identify embryos with two recessive alleles, but the IVF process may not produce an unaffected embryo suitable for transfer.
Evaluate embryo screening for this couple.
[6 marks]
4 marksFoundation and HigherRequired practical 074.7.2.1 Levels of organisation
AQA Trilogy 8464
Spec and skills
Paper scope: B2
Spec 4.7.2.1
Original practice question
Answer and supported method checks
A transect runs from a shaded wall into a lawn. Mean plant counts per quadrat at 0, 2, 4, 6 and 8 m are 1, 3, 6, 6 and 5 respectively.
.1
Describe the pattern in the data without claiming a cause.
[2 marks]
.2
Explain how to investigate whether light accounts for the pattern.
[2 marks]
4 marksHigher4.6.2.4 Genetic engineering
AQA Trilogy 8464
Spec and skills
Paper scope: B2
Spec 4.6.2.4
Original practice question
Answer and supported method checks
An engineer wants all cells of a new plant to contain an introduced gene. Another proposal would insert the gene into just a few cells of a fully grown leaf.
.1
Explain why introducing the gene at an early developmental stage is more suitable for the first aim.
[2 marks]
.2
Explain a limitation of inserting the gene only into a mature leaf.
[2 marks]
4 marksHigher4.7.1.2 Abiotic factors
AQA Trilogy 8464
Spec and skills
Paper scope: B2
Spec 4.7.1.2
Original practice question
Answer and supported method checks
Researchers record 48 freshwater invertebrate species at an unpolluted site and 18 at a site with low dissolved oxygen. The sites also differ in temperature and water flow.
.1
Calculate the percentage decrease in species count relative to the unpolluted site.
[2 marks]
.2
Evaluate the claim that low oxygen alone caused the decrease.
