Paper 1, Higher

Explain why a sperm cell has many mitochondria.

An image of a cell is 60 mm long. The real length of the cell is 0.0025 mm. Calculate the magnification.

Describe a method to investigate the effect of pH on the rate of reaction of amylase.

A potato cylinder had a mass of 1.85 g. After 30 minutes in a sugar solution its mass was 1.85 g. Calculate the percentage change in mass and explain what this shows.

How many chromosomes are in a human body cell?

Describe a method to investigate the effect of caffeine on reaction time.

Explain why the ratio of male to female offspring is expected to be 1 : 1.

Explain how a new species can form.

Describe how a sheep can be cloned by adult cell cloning.

Describe the symptoms and treatment of a named fungal or protist disease.

Describe how the body's non-specific defences stop pathogens entering.

Explain how antibiotic resistance develops in bacteria.

Calculate the BMI of a person with mass 82 kg and height 1.75 m. (BMI = mass ÷ height²)

A root hair cell is specialised for absorbing water and mineral ions. Explain two adaptations.

Explain why electron microscopes have increased our understanding of sub-cellular structures.

Which enzyme breaks down lipids?

Explain how active transport differs from diffusion.

Explain why mitosis is important.

Explain how the eye focuses on a near object.

Describe the structure of DNA.

Describe the evidence that supports the theory of evolution.

Describe the process of genetic engineering to make bacteria produce human insulin.

Explain how tobacco mosaic virus affects plant growth.

Explain why a person who has had chickenpox is unlikely to catch it again.

Explain why drugs are tested on healthy volunteers at low doses first.

Calculate the BMI of a person with mass 64 kg and height 1.6 m. (BMI = mass ÷ height²)

What is the function of ribosomes?

Describe how to prepare a slide of onion epidermis cells and view it with a light microscope.

Explain the lock-and-key model of enzyme action.

Explain how the structure of alveoli makes gas exchange efficient.

Give three differences between mitosis and meiosis.

Describe the functions of the cerebral cortex, cerebellum and medulla.

Explain how a mutation can change the function of a protein.

Explain how Darwin's and Wallace's work contributed to the theory of evolution.

Explain one problem with selective breeding.