Paper 1, Higher

Which structure is found in plant cells but not animal cells?

An image of a cell is 18 mm long. The real length of the cell is 0.012 mm. Calculate the magnification.

A potato cylinder had a mass of 2.40 g. After 30 minutes in a sugar solution its mass was 2.64 g. Calculate the percentage change in mass and explain what this shows.

Describe the stages of the cell cycle.

Explain why an enzyme stops working at high temperatures.

Explain the role of bile in digestion.

Explain why the human circulatory system is described as a double circulation.

Describe how water moves from the roots to the leaves in a plant.

Describe how measles and HIV are spread and how the spread can be reduced.

Explain how a vaccine protects a person against a disease.

Describe the stages in developing a new drug.

Explain how smoking increases the risk of cardiovascular disease and lung cancer.

Write the word equation for photosynthesis.

Compare aerobic and anaerobic respiration in muscles.

Describe three differences between prokaryotic and eukaryotic cells.

An image of a cell is 45 mm long. The real length of the cell is 0.03 mm. Calculate the magnification.

A potato cylinder had a mass of 3.20 g. After 30 minutes in a sugar solution its mass was 2.88 g. Calculate the percentage change in mass and explain what this shows.

Evaluate the use of embryonic stem cells in medicine.

In an investigation, 2.4 cm³ of oxygen was collected in 40 s from hydrogen peroxide broken down by catalase. Calculate the mean rate of reaction in cm³/s and name one variable to control.

Explain how villi are adapted for absorbing digested food.

Compare the structure of arteries and veins.

In a potometer, the air bubble moved 3.6 cm in 12 minutes. The capillary tube has a radius of 0.5 mm. Calculate the rate of water uptake in mm³ per minute.

Explain why antibiotics cannot be used to treat viral infections.

Describe three ways white blood cells defend the body.

Explain what a double-blind trial is and why it is used.

Evaluate the use of stents and statins to treat coronary heart disease.

Describe a method to investigate the effect of light intensity on the rate of photosynthesis in pondweed.

Explain why breathing rate stays high after exercise.