Science revision
Biology
uncontaminated culture
an uncontaminated culture of microorganisms can be grown using petri dishes and agar
features of bacteria
lack of membrane bound organelles
an organelle is something that performs multiple things in a cell
unicellular
microscopic
not all prokaryotic cells are bacteria
orders of magnitude
for every order of magnitude times the number by 10 to increase
A fox is 40 cm long and the tick on the fox is 0.4 cm long how many orders of magnitude is the fox larger than the tick ? 2 magnitudes larger
one 0 is one order of magnitude
every order of magnitude is 10x larger than the last
Use estimations and explain when they should be used to judge the relative size or area of sub-cellular structures.
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if there was a leaf cell at 70 nano meters and you are comparing it to a red blood cell which is 7 nano meters the equation would be 70 / 7 nanometers
enzymes
Speed up chemical reactions
in the digestive system enzymes are proteins that break down larger molecules like fat
Amylase which is produced in the mouth
pepsin which is produced in the stomach
Ribonuclease
Heart
Heart valves may become faulty so they are not opening as wide as the should which is restricting blood flow to the heart and the pressure of blood decreases which can cause the lungs to fill up with water.
Disease
Health and disease have a relationship because health is not just a physical thing ( being free from disease ) it also include s things such as mental state but disease is stopping the body from working.
Difference in malignant and benign tumours
Benign tumours usually grow slowly or not at all and are normally easily removable but malignant tumours grow rapidly and invade all normal healthy tissue
Coronary heart disease is a disease the narrows coronary arteries which take blood away from the heart.