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biology paper 2:
biology: paper 2: energy transfers in and between organisms:
Question | Answer |
---|---|
1. describe the light independent reaction of photosynthesis | CO2 combines with ribulose bisphosphate making 2 glycerate3-phosphate molecules which is reduced to triose phosphate using NADP and energy from ATP triose phosphate converted to hexose phosphate used for organic substances eg glucose and amino acids |
2. where does the light dependent reaction of photosynthesis occur? | thylakoids of chloroplast |
3. where does the light independent reaction of photosynthesis occur? | stroma of chloroplasts |
4. describe what happens during photoionisation in the light dependent reaction | chlorophyll absorbs light to excite electrons so electrons are lost |
5. what are specific properties of ATP that make it a good energy source? | releases small, manageable amounts of energy small soluble so transported easily around cell easily broken down quickly remade phosphorylate other molecules cannot pass out cell so there as an immediate source of energy |
6. describe the light dependent reaction of photosynthesis | light absorbed by chlorphyll in thylakoid to excite electrons electrons released carried from carrier to carrier generates sufficient energy to make ADP + Pi -> ATP |