AQA AS Biology Notes - Unit 1

COMPETITIVE INHIBITORS: 
- Fit into the ACTIVE SITE to prevent substrates being catalysed.
- Usually temporary, i.e. once they break off, the substrate has a chance to squeeze in.
 

NON-COMPETITIVE INHIBITORS: 
- Fit into an ALLOSTERIC site elsewhere on the enzyme
- Usually permanent, and therefore can distort the 3D tertiary structure of the enzyme. 

VEINS BRING
DEOXYGENATED BLOOD
FROM THE BODY
TO THE HEART

- ARTERIES TAKE OXYGENATED BLOOD AWAY FROM THE HEART

- THEY HAVE HIGHER BLOOD PRESSURE THAN VEINS

THEY ARE STRUCTURED TO WITHSTAND CHANGES IN PRESSURE AND TO MAINTAIN HIGH BLOOD PRESSURE

PULMONARY VEIN = BRINGS OXYGENATED BLOOD
TO THE HEART

PULMONARY ARTERY = BRINGS DEOXYGENATED BLOOD
TO THE LUNGS

Plant cells have:
-Chloroplasts
-Vacuoles
-Cell wall to maintain rigidity and prevent cell lysis
-Have Centrosomes but no Centrioles

Animal Cells have:
-Microtubules
-Peroxisome
-Lysosome
-Occasional Cilia
-Centrosomes with centrioles