A level Biology Paper 2 Revision

A decrease in the activity of the enzyme rubisco would limit the rate of photosynthesis. Explain why. - 1. Less carbon dioxide reacts with RuBP; 2. Less GP; Describe how alterations to tumour suppressor genes can lead to the development of tumours. - 1. Increased methylation of tumour suppressor genes 2.Mutation occurs 3. Tumour suppressor genes are not transcribed/expressed Effect of limiting Light on the calvin cycle? - RuBP decreases - being converted into GP but not being reformed from TP (no ATP) GP increases - not converted into TP (no ATP/reduced NADP) but is being formed from RuBP EXAM QUESTION: PHOTOSYNTHESIS Heat stress decreases the light-dependent reaction of photosynthesis. Explain why this leads to a decrease in the light-independent reaction. - 1. No ATP; 2. No reduced NADP;