photosynthesis Flashcards

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1
Q

what is an autotroph

A

organisms that can make organic molecules(glucose) from inorganic molecules (co2). they also use light or chemical energy to do this

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2
Q

what is a heterotroph?

A

organisms that have to obtain organic molecules(glucose) that have been made by another organism(eat plants or animal matter-secondary, tertiary , quaternary consumers)

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3
Q

what is a light dependant reaction

A

energy s absorbed from sunlight
atp is made
hydrogen from water is used to form reduced atp

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4
Q

what’s a light independent

A

hydrogen from reduced naps and co2 is used to build organic molecules
atp is needed

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5
Q

explain the steps of the calvin cycle(LIR)

A

1.the enzyme rubisco adds CO2 to RUBP (5c)to make GP(3c)
2.GP is reduced to TP using ATP for energy (from LD)aswell as NADPH which provide H+ to make the TP
3)5/6 f the TP made is converted aback to PUP which is then given another phosphate form ATP to make RUBP
4) the 1/6 left of TP made is used to make carbs, amino acids, cellular ect

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6
Q

RUBP meaning

A

Ribulose Bisphosphate

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7
Q

meaning of GP

A

Glycerate 3-Phosphate

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8
Q

TP meaning

A

Triose Phosphate

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9
Q

RUP meaning

A

Ribulose Phosphate

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10
Q

explain the steps of the light dependant reaction

A

1.light hits the photo system 2 and excited 2 electrons which leave chlorophyll
2.and pass down the electron transport chain
3.the electrons release energy that pumps H+ into the thylakoid space
4.light then hits photosystem 1 and then excited 2 electrons which leave chlorophyll and pass down electron transport chain and are accepted by NADP

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11
Q

what is photolysis and how does it link to LD

A

ps2 has an enzyme that in light performs photolysis of water forming 2H+2e&1/2O2. The 2e/ reduce the oxidised chlorophyll in ps2 that had originally lost electrons

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12
Q

what happens differently in a cyclic Light dependant reaction

A

the 2 excite electrons wave ps1 but pass back down the electron transport chain, creating no atp and no photolysis and no NADP

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