A breeder repeatedly selects the largest tomatoes from closely related plants. Average fruit size rises, but a disease damages almost all plants in the new line.
.1
Explain how the breeder increased fruit size.
[2 marks]
.2
Suggest why the new line may be unusually vulnerable to one disease.
[2 marks]
4 marksFoundation and Higher
Spec and skills
Original practice question
Answer and supported method checks
A respirometer shows a germinating seed sample uses 2.4 cm³ oxygen in 8 minutes. Its mass is 3.0 g. An equal-mass boiled sample uses no measurable oxygen.
.1
Calculate oxygen uptake rate per gram in cm³ per minute per gram.
[2 marks]
.2
Explain the difference between the seed samples.
[2 marks]
4 marksFoundation and Higher
Spec and skills
Original practice question
Answer and supported method checks
A patient with influenza asks for antibiotics and takes a painkiller to reduce fever.
.1
Explain why antibiotics do not cure influenza and why the painkiller may still help.
[2 marks]
.2
Explain why developing drugs against viruses can be difficult.
[2 marks]
4 marksFoundation and Higher
Spec and skills
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]
6 marksHigher
Spec and skills
Original practice question
Answer and supported method checks
A campaign says: "Every lung cancer case is caused by smoking, so non-smokers need not consider any cancer risks."
