Exam Style Questions Flashcards
(12 cards)
5cm cubed of milk B and 1cm cubed of lipase were added to a different test tube. The pH of this mixture was pH 7. This test tube was placed in a water bath for 10 minutes. The pH of the mixture changed from pH 7 to pH 5.
Explain what caused this change in pH (3)
Lipase will break down the fat into fatty acids and glycerol. Fatty acids have a low pH
A student was investigating mitosis in the roots of a garlic plant.
Describe how the student could prepare a microscope slide to show mitosis in the growing roots of a garlic plant.
Soften the root with alcohol, acid or heat
Crush the root onto the slide/take a thin section
Stain the root with iodine
Add a drop of water to the slide
Add a cover slip
Describe what is produced when a single cell divides by mitosis.
Two cells
Diploid cells/same number of chromosomes as parent cell
Genetically identical cells
Body cells
What process moves alcohol from the blood into liver cells
Diffusion
State where genes are found in cells
In the nucleus
Describe the changes that occur in the eye when a bright light s directed into the eye
Pupil becomes smaller
The iris changes shape
State one way brain tumours can be detected
CT scanning
Explain why a brain tumour is difficult to treat
Brain is protected by the skull
It is difficult to access
Nerves do not repair
The risk of damage to the brain
State why egg cells have a large amount of cytoplasm
To supply a large amount of nutrients for the zygote/embryo
Explain why solid magnesium carbonate cannot conduct electricity but solid magnesium can
Magnesium contains delocalised electrons
Ions in magnesium carbonate cannot move
Electrons in magnesium are mobile
The force that keeps an object moving in a circular path is known as as the…
Centripetal force
Describe the difference between transverse waves and longitudinal waves
Transverse waves include oscillations perpendicular to the direction of travel of the wave where as longitudinal waves have oscillations in the same direction of travel as the wave
