A clinic diagnoses gonorrhoea in a patient with pain on urination. An initial antibiotic fails; tests identify a resistant bacterial strain.
.1
Explain why an antibiotic can be appropriate for gonorrhoea but this antibiotic failed.
[2 marks]
.2
Explain how a barrier method reduces transmission and why pain relief alone does not prevent spread.
[2 marks]
6 marksFoundation and Higher
Spec and skills
Original practice question
Answer and supported method checks
Students want to test whether doing mental arithmetic changes ruler-drop reaction time. They will use a safe classroom investigation with volunteers. You may compare drop distances directly: longer distances indicate slower reactions.
Plan the investigation so that the results can support a valid comparison.
[6 marks]
4 marksHigher
Spec and skills
Original practice question
Answer and supported method checks
A disease-resistance allele R is dominant. Plant A is RR and plant B is rr. Their offspring are then crossed with each other.
.1
Construct the first cross and explain the genotype of its offspring.
[2 marks]
.2
Explain the predicted outcomes when two first-generation plants are crossed.
[2 marks]
5 marksFoundation and Higher
Spec and skills
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 Higher
Spec and skills
Original practice question
Answer and supported method checks
Plant tissue gains 4% mass at 0.20 mol/dm³ sugar and loses 4% at 0.40 mol/dm³. Assume a linear relationship between these points.
.1
Estimate the concentration giving zero net mass change.
[2 marks]
.2
Explain what zero net change means and how to improve the estimate.
