8 Flashcards

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1
Q

Photosynthesis is separated into

A
  • light reactions

- calvin cycle

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2
Q

the conversion of CO2 into an organic form is called— and how does it work

A

carbon fixation - a reduction reaction with electrons being added to CO2

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3
Q

where does photosynthesis take place in a cell

A

the cholorplasts

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4
Q

After the pigment molecule absorbs a photon of light in photosynthesis, one of three possible events can occur

A
  • the excited electron returns to ground state and releases energy of a longer wavelength
  • The energy of the excited electron is transferred to a neighbouring molecule in a process called inductive resonance
  • the excited electron is transferred to an electron accepting molecule called a primary acceptor
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5
Q

Difference between absorption spectrum and action spectrum

A

The absorption spectrum shows which wave lengths are absorbed in each individual type of chlorophyll. The action spectrum shows which wavelengths of light are most effective for photosynthesis.

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6
Q

function of a photosystem

A

trap photons of light and use the energy to oxidize a reaction centre chlorophyll, with the electron being transferred to the primary electron acceptor

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7
Q

The 3 key events that take place within photosystem II

A
  1. The absorption of photons and energy to the reaction centre result in an electron within P680 being excited- now changed to P680*
  2. P680* can be oxidized to P680+ by the primary electron acceptor
  3. P680+ is reduced back to P680 by a donation of an electron from H2O
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8
Q

Linear electron transport

A

The pathway of electron flow from photosystem II through photosystem I to synthesize NADPH

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9
Q

3 main phases of one turn of the Calvin cycle are

A
  1. Fixation - CO2 is added to RuBP making a rubisco, and then split into two PGA’s
  2. Reduction - PGA is phosphorylated and then hydrogen is added to it.
  3. Regeneration - in a series of reactions, ATP is used to rearrange 5 G3P into 3 RuBP
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10
Q

summary of calvin cycle

A

CO2 is reduced and converted into carbs by adding electrons and hydrogen carried by the NADPH produced in light dependant reactions, ATP is also used

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11
Q

oxygen is a —– of rubisco

A

competitive inhibitor, it competes with CO2 for the active site

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12
Q

In aquatic photoautotrophs

A

an ATP process pumps bicarbonate into the cell which is converted to CO2 by a enzyme carbonic anhydrase

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