Class notes for CIE Cambridge International AS and A Level Biology Coursebook; Chapter: Photosynthesis
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Module
CIE
Institution
CIE
Book
Cambridge International AS and A Level Biology Coursebook with CD-ROM
Well written and developed notes, providing a detailed description and understanding on the chapter, Photosynthesis. This chapter is studied in A2 during A-Levels and discusses in depth, how plants use light energy to synthesis energy. These are electronic notes written under the lectureship of Dr....
these are light harvesting clusters made up of photosynthetic pigment molecules
.
primary pigment is made up of chlorophyla .
Accessory pigments consist of all other
molecule
-
photo activation : it is emission of high
-
energy electrons from chloro phyla
molecule when light energy falls on it .
.
accessory pigments are present around the primary pigment in the form of a
cone They help to collect and direct light energy towards the primary pigment
.
and they avoid loss of light energy
TYPES OF PHOTOSYSTEM's
I. photosystem I or 17700
photoactivation occurs at wavelength of light energy
700hm
-
Max -
II. Photosystem I Or 13680 Both PI and PI are present in a thylakoid
.
.
Kitt DEPENDENT REACTION
location : thylakoid
•
I cyclic phosphorylation
-
ADP 1- Pi ATP presence of light
Describe cyclic PPR .
-
Only PIP 700 is involved
•
light energy falls on the primary pigment photoactivation center of PI
high energy electrons are emitted from chlorophyll , a molecule
.
•
. electrons pass through ETC located in thylakoid membrane .
.
che miosmosis occurs and ATP is made .
.
electrons fall back into PI therefore . . . .
cyclic PPR
.
product of cyclic PPR ATP only
compare tabulate state differences between oxphos and cyclic PPR .
4
\ non -
cyclic phosphorylation .
both PI and PI are involved
i. Describe events of non -
cyclic PPR . 6 marks
PI involved
30th PI and are
.
photoactivation occurs , electrons are emitted from both photosystems
membrane, release energy which is used for chemiosmosis
.
electrons pass through ETC of thylakoid
-
ATP is made
. I do not fall back into their original system that is why it is called non -
cyclic PPR .
replaced by e- from PI
-
e- lost from PI are
-
e- lost from PI are replaced by é mole photolysis of water
in
.
photolysis of water occurs inside thylakoid space by an enzyme
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