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a student wanted to extract the DNA from fresh peas.
the student crushed the peas and added washing up liquid and water.
the enzyme protease was then added to this mixture.
explain why the enzyme protease was added to the mixture
to break down proteins in the cell membrane
it destroys enzymes that may break down the DNA
state why ice cold ethanol is poured into the filtrate in DNA extraction
too see the DNA because DNA is insoluble in ethanol
explain how HIV can lead to the onset of AIDS
HIV destroys white blood cells, weakening the immune system so the person is more susceptible to other pathogens
state how the use of antibiotics could contribute to bacteria developing resistance to antibiotics
people not completing their course of antibiotics
5cm3 of milk A and 1cm3 of lipase were added to a test tube
the pH of the mixture was 7.
there was no change in the pH after 10 minutes
explain why there was no change in the pH of the mixture containing milk A
there are no lipids in the milk to break down, so fatty acids were not produced
a student was investigating mitosis in the roots of a garlic plant
describe how to student could prepare a microscope slide to show mitosis in the growing roots of a garlic plant
use the root tip of the garlic, soften the root with heat.
crush the root onto the slide
stain the root with iodine
add a drop of water to the slide
add a cover slip
