Wednesday, January 9, 2013

Absorption and action spectra

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7 comments:

  1. AnonymousJanuary 19, 2013 at 6:34 AM

    Hello Miss Teong,

    I have a few questions,

    Does all thylakoid membrane only have 1 set of photosystem I and II?

    Photosystems only contain chlorophyll a? Does it contain chlorophyll b? or does it depends sometimes?

    THANKS!!!

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    Replies
    1. Miss TeongJanuary 19, 2013 at 10:32 PM

      Hi,

      The pictures in your lecture notes are only a diagrammatic representation to aid your understanding. You shouldn't take the numbers literally. The thylakoid membrane can have more than one set of photosystems I and II.

      Photosystems contain light harvesting complexes surrounding a reaction centre. Reaction centre only contain SPECIAL chl a molecules, but the light harvesting complexes contain a range of photosynthetic pigments (chl a, b, carotenoids etc) so as to maximise light absorption.

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  2. AnonymousJanuary 19, 2013 at 5:36 PM

    Does the Proton pump on thylakoid membrane use ATP since it pumps H+ via active transport into thylakod space? Or does it just use energy from ETC?

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    Replies
    1. Miss TeongJanuary 19, 2013 at 10:33 PM

      Great question. I think some students may be thinking about this same question.

      The proton pump uses only energy released from the electron flow in the ETC. This form of energy is NOT in the form of ATP.

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    2. AnonymousJanuary 20, 2013 at 2:02 AM

      Okay Thank you! =D

      Delete
  3. AnonymousJanuary 20, 2013 at 2:07 AM

    Oh yes may I know which compounds names do you all normally use in calvin cyle? There are multiple names for some of them and its confusing so do we need to know all of them?

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    Replies
    1. Miss TeongJanuary 20, 2013 at 2:40 AM

      You have to know all the alternative names as Cambridge uses either one of them in the exams.

      Delete

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