Source: Maths & Science Guide
- State the effect of an enzyme on an oil molecule.
- State two conditions that denatures an enzyme.
- State the conditions of the valves during atrial systole.
- It converts it to fatty acid and glycerol.
- Temperature and pH.
- The valves close and the wall of the atria contract.
- The word "convert" does not convey the information that it is done with water being the reagent, and that it is a breakdown process. The correct terminology should have been "hydrolyses".
- The student stated temperature and pH but did not give an indication on whether both conditions should be high or low.
- The keyword here is "the conditions of the valves". Students should know that there are two types of valves - atrio-ventricular valves (bicuspid and tricuspid valves), and semilunar bases at the aorta and pulmonary artery.
- It hydrolyses it to fatty acids and glycerol.
- Extreme temperature and extreme pH.
- a) The semilunar valves close.
b) The bicuspid and tricuspid valves open.