A patient may be fitted with an artificial pacemaker.
What condition may be treated using an artificial pacemaker?
Back
Card 17
Front
Explain why the masses of the eggs increased.
Back
Card 18
Front
Explain how the student could modify the investigation to determine the concentration of the solution inside each egg.
Back
Card 19
Front
Explain how calcium ions are moved from the shell into the cytoplasm of the egg.
Back
Card 20
Front
What are aphids?
Back
Card 21
Front
An aphid feeds by inserting its sharp mouthpiece into the stem of a plant.
Give the reason why the mouthpiece of an aphid contains a high concentration of dissolved sugars after feeding.
Back
Card 22
Front
Plants infected with aphids may show symptoms of magnesium deficiency.
Magnesium deficiency symptoms include: yellow leaves and stunted leaves.
Explain how a deficiency of magnesium could cause these symptoms.
Back
Card 23
Front
A farmer thinks a potato crop is infected with potato virus Y (PVY). box. The farmer obtains a monoclonal antibody test kit for PVY. To make the monoclonal antibodies a scientist first isolates the PVY protein from the virus.
Describe how the scientist wo
