Enzymes came up for me. The cells part was just neurons and synapses for me. The thing about the plants growing towards light too. Everything else was just stuff we didn't get much focus on in lessons so I skimmed over the revision for it. Hoping me just padding the questions out with babble works to get marks :P
Adding to what Sach said, it helps digest food, and there are multiple enzyme for food groups. Some examples would be amylase and carbohydrase for carbs. They break up the starch molecules within the food into simpler sugars, such as glucose, galactose and fructose.
Ah... there was a Chemistry question I didn't get, and apparently it had to do with enzymes. I don't recall ever learning about them, though, that's odd :P
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