4 marksFoundation and Higher4.6.1.3 DNA and the genome
AQA Trilogy 8464
Spec and skills
Paper scope: B2
Spec 4.6.1.3
Original practice question
Answer and supported method checks
A news report claims that a gene is a whole chromosome and the genome is the collection of proteins in a cell.
.1
Correct both claims using the relationships between DNA, genes, chromosomes and the genome.
[2 marks]
.2
Suggest two benefits of studying human genomes.
[2 marks]
4 marksFoundation and Higher4.7.3.4 Deforestation
AQA Trilogy 8464
Spec and skills
Paper scope: B2
Spec 4.7.3.4
Original practice question
Answer and supported method checks
Forest is cleared to grow crops used as livestock feed. Cut trees are burned.
.1
Explain two different mechanisms by which this can increase atmospheric carbon dioxide.
[2 marks]
.2
Explain why biodiversity can decline even if a crop rapidly covers the cleared ground.
[2 marks]
4 marksFoundation and Higher4.5.2 The human nervous system
AQA Trilogy 8464
Spec and skills
Paper scope: B2
Spec 4.5.2
Original practice question
Answer and supported method checks
Two neurones meet at a synapse. An electrical impulse reaches the end of the first neurone.
.1
Describe how information passes to the second neurone.
[3 marks]
.2
A substance stops release of the chemical. Predict the effect on transmission at this synapse and explain your answer.
[1 mark]
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 Higher4.6.3.2 Fossils
AQA Trilogy 8464
Spec and skills
Paper scope: B2
Spec 4.6.3.2
Original practice question
Answer and supported method checks
A buried bone is found in sedimentary rock, while a soft-bodied organism from the same ancient habitat has left no recognisable fossil.
.1
Describe how the bone could become a fossil.
[2 marks]
.2
Explain why this find cannot prove that only hard-bodied organisms lived there.
