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Class notes CIE for Cambridge International AS and A Level Biology Coursebook; Chapter: Energy and Respiration

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Well written and developed notes, providing a detailed description and understanding on the chapter, Energy and Respiration. This chapter is studied in A2 during A-Levels and discusses the synthesis, usage and benefits of energy in daily life. These are electronic notes written under the lectureship of Dr. Darakhshan, an outstanding Biology teacher and Gynaecologist, teaching in Roots Millennium, Islamabad. The only notes you need for an A* in A-Level Biology!

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RESPIRATION
respiration

Def: it is a chemical process in which a respiratory substrate e.g glucose is
broken down to release energy needed in living organisms

food product containing most hydrogen atoms provides
most
energy
.




Definitions
Phosphorylation addition of 13043 group ( ADP → ATP)
-



:



De Phosphorylation removal of phosphate group ( ATP → ADP)
-
:




Hydrogenation addition of H atom
:




Dehydrogenation removal Of It atom
:



Reduction : addition of H atom
Oxidation : addition of oxygen
carboxy a lati n : addition Of (E) 2
.



: removal of CO2
Decarboxylation
> =


addition of oxygen
.
removal of electron
.
removal of hydrogen



> =
-

removal of oxygen


addition of hydrogen
.
addition of electron



Types of Phosphorylation
substrate level
Oni dative Phosphorylation
Photo Phosphorylation
-

, i substrate level

when Pou
-3
is added to a substrate e. g-
(a) Glucose + Pou Glucose Phosphate
OR
Glucose + ATP Glucose phosphate + ADP
In cytoplasm



(b) ADP + Pi ( inorganic Pou ) ATP



ii -

Oxidative phosphorylation

when phosphorylation occurs in the presence of oxygen , so that
oxygen acts as a final electron acceptor
Ox phos Occurs
-
in inner membrane of Mitochondria .




iii -

Photo phosphorylation
addition of phosphate in presence of light energy e. g. When ADP
.




is changed to ATP in light dependent reaction to photosynthesis
location : Thylakoid




Q. The need for energy in living organisms.
-
ATP as universal energy currency
-



light energy for photosynthesis
.

ATP used in conversion of glucose phosphate to those phosphate in glycolysis
-
ATP used to regenerate RUBP
.

energy needed for Anabolic reactions
-


protein synthesis / starch formation / triglyceride formation
-
activation energy
activate glucose in glycolysis
-


.




-
active transport .
e.
g. sodium / potassium pump
movement / locomotion .
e- g. muscle contraction / cilia beating / endocytosis /exocytosis / bulk transport

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Uploaded on
February 25, 2022
Number of pages
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Written in
2021/2022
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