Flashcards
photosynthesis-1
Cards in this deck (17)
- 1what is the stromawithin the chloroplast
fluid filled matrix and site of LIR
starch grains, oil droplets, DNA and small ribosomes
large SA for photosystems - 2photosynthetic pigmentsaccessory pigments collect light energy and funnel energy down to the primary pigment(reaction centre)
- 3photosystem 1 and 22-680nm
1-700nm - 4chlorophyll a structureporphyrin group
Mg ion and hydrocarbon tail - 5where does the LDR take placethylakoid membrane
- 6what happens in the LDRlight energy is absorbed by pigments and converted into chemical energy
it does this as light energy is used to add a phosphate group to ADP-forming ATP and forming reduced NADP. reduced NADP transfers H to light independent reaction
h20 is oxidised to 02 - 7Where does the LIR occur and alternative nametakes place in the stroma
alternative name=calvin cycle - 8what happens in the LIRATP and reduced NADP from the LIR supply the energy and H to make glucose from CO2
- 9why does the lir only occur in daylight even though named 'light independent reaction'atp and red NAD are required-produced in LDR
mg2+ ions from stroma increase in daylight-cofactor for rubisco
ferredoxin-reduced by e- in daylight, activates enzymes in calvin cycle - 10process of lir6co2 fixed to 6 ribulose bisphosphate(RuBP)
produces 6GP molecules (glycerate-3-phosphate)
12ATP-ADP and Pi and 12 red NADP-12NADP
12 triose phosphate (3C)-2 go away to form glucose. 5ATP-5ADP, back to RuBP - 11cyclic vs non cyclic photophosphorylationcyclic phosphorylation only uses photosystem 1 and the electrons are recycled-doesnt produce NADP or O2
cyclic-photosystem 2-1. electrons and H+ to NADP----red NADP. also produces - 12new calvin cycleribulose bisphosphate and CO2 join to form an unstable 6C compound with the help of RuBisCO. this breaks down into 2 molecules of glycerate-3-phosphate. this is converted into triose phosphate using ATP and red NADP
converted to ribulose bisphosphate using ATP - 13optimum temperature for resp 10, 25, 4525 as involves enzymes which become inactive at 10 and denature at 45
- 14light intensityred NADP and ATP in short supply
therefore conversion of GP to TP and RuBP is slow. level of GP will rise - 15temperatureRuBisCO less active
so all reactions will be slower
levels of RuBP,GP and TP will fall - 16low CO2 concentrationno more glycerate phosphate can be made
level of ribulose bisphosphate increases
levels of GP and TP will fall - 17investigating rate of photosynthesis with temppondweed in test tube. water known temp.
test tube connected to capillary tube==syringe. pondweed allowed to photosynthesise. syringe used to pull bubble up capillary tube where length can be measured using a ruler
Information
- Description
- A2 a2 biology Flashcards on photosynthesis-1, created by Peter Fitzroy on 17/10/2017.
- Created by
- Peter Fitzroy
- Views
- 1
- Rating