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Summary Topic 7 Cellular Respiration

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Edexcel Biology Topic 7 Cellular Respiration, Glycolysis, Link Reaction, Krebs Cycle, Oxidative Phosphorylation

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Uploaded on
January 20, 2025
Number of pages
7
Written in
2023/2024
Type
Summary

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Cellular Respiration

Oxygen glucose + - Carbon dioxide + water

GO2 + CoHizO0 -
> SCO2 + OH2O
S.I units ↓
Removing hydrogen using Coenzymes NAD FAD
+




metabolic
pathway Series of linked chemical reactions
-
> =




catalysed by specific enzymes
with end
product
inhibition


Enzymes in metabolic
pathway later reaction
may
inhibit earlier
enzyme
at allosteric site


Catabolism
e breakdown
of complex into simple
molecules
produced (Anabolism ATP)
ATP
proteinsynthes is
+
, requires

oxidoreductases -




enzymes catalysing
oxidation and reduction reaction .
OILRIG


Hydrolases e
catalyses hydroly sis reaction
by
breaking by molecules addition of water


Coenzymes enon-protein
assist enzymes
.
organic molecules which


hydrogen acceptors
-
NAD + FAD

ATP is needed
for ...

↳ muscle contraction
-
cell movement


Synthesis of macromolecules
>
-




ATP
-small
consists
, water soluble
nucleotide
,
easily base
transported
-



of admine , ribuse

Sugar and 3 phosphate

-most produced during redox
ATP reaction in ETC
ATPFADP Pi yields free energy
+
e

, An e


*
S.I units

/
440 Phosphate
ribose



Glycolysis : Occurs inhe
cytoplasm ; same
for aerobic and anaerobic


Glucose enters he cell via
facilitated diffusion with
across the
carrier proteins transporting membrane


Transmembrane and specific
Large and polar
↳ keep it within cells


A) Phosphorylation

glucose is phosphorylated by adding 2 phosphate
from 2 ATP molecules

L fructose I
G diphosphate
a more reactive


splits of triose phosphate (3C) and molecules of ADP
produced so far .




B) Oxidation :
each triose phosphate is oxidised
to
form pyruvate (loses HTT

Co-enzyme NAD" collects he
hydrogen ions


+
NAD++ 2H + 2e e NADH + H+

+
2 NAD + + 4H+ - 2 NADH + 2H


>
-

Intermediate compounds donate inorganic phosphates
to ADP to make ATP
I substrate level
phosphorylation .
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