Biology 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.

Explain why an enzyme stops working at high temperatures.

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.

Describe the pathway of a reflex action when a hand touches a hot object.

Explain the terms gene, allele and genotype.

Explain how natural selection could lead to the evolution of camouflaged moths.

Describe the process of selective breeding of cattle for high milk yield.

Explain why the three-domain system replaced the five-kingdom system.

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.

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.

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.