5 cell respiration
TRANSCRIPT
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1) List out 2 differences between passive transport and active transport.
2) What is the main difference between reverse pinocytosis and secretion of exocytosis?
3) When do the following transportation process stop?
1) passive transport
2) active transport
4) What is the definition of water potential?
5) List out 2 factors that affect the rate of diffusion process across a membrane.
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6) List out 3 characteristics of enzyme.
7) What is the difference between exergonic and
endogonic reaction?
8) Which type of inhibitor involved in allosteric
effect?
9) List out 2 factors that affect enzyme activities
and briefly explain.
10)a) List out 3 types of cofactor.
b) Which cofactor bound loosely to
enzyme?
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Cellular Respiration a cellular process: - breaks down CHO and
other metabolites
- buildup of ATP consumes O2 and produces CO2 aerobic process usually involves breakdown of glucose to
CO2 and water Substrates for respiration: - glucose - fats - proteins
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Cellular Respiration usually involves breakdown of glucose
to CO2 and water
energy extracted from glucose molecule:
released step-wise
allows ATP to be produced efficiently
oxidation-reduction enzymes include NAD+ and FAD as coenzymes
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Glucose Breakdown: Summary Reaction
oxidation-reduction reaction
electrons are removed from substrates and received by O2, which combines with H+ to become H2O.
glucose is oxidized and O2 is reduced
+ + energy
Reduction
Oxidation
glucose
C6H12O6 6O2 6CO2 6H2O+
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Phosphorylation
2 types: - substrate-level
- oxidative substrate-level:-
formation bond between ADP and P (from high-energy molecule which has an unstable P group)
catalysed by transferase (phosphorylase) does not required O2 occur in cytoplasm, nucleus or
mitochondria
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Substrate-level phosphorylation
P
P
P ATP
enzyme
ADP
BPG
3PG
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Phosphorylation
oxidative:- formation of ATP from ADP and
inorganic phosphates O2 is required inside mitochondria (cristae) involve electron transport system e- is transferred energy to form ATP
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NAD+ and FADNAD+ (nicotinamide adenine dinucleotide)
a coenzyme of oxidation-reductionoxidize a metabolite by accepting e-
reduce a metabolite by giving up e-
used repeatedly FAD (flavin adenine dinucleotide)
a coenzyme of oxidation-reduction sometimes used instead of NAD+
accepts 2 e- and 2 H+ to become FADH2
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Cellular Respiration
ADP + PATP
intermembranespacecristae
CO2
H2O
glucose from
O2 from air
O2 and glucose enter cells,which release H2O and CO2.
Mitochondria useenergy fromglucose to form ATPfrom ADP + P .
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Phases of Cellular RespirationCellular respiration includes 4 phases:
Glycolysisbreakdown of glucose into 2 molecules of pyruvate
occurs in cytoplasmATP is formeddoes not utilize O2
Transition (preparatory) reaction both pyruvates are oxidized in mitochondria e- energy is stored in NADH2 C are released as CO2 (1 from each pyruvate)
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Citric acid cycleoccurs in the mitochondrion matrix and produces NADH and FADH2
releases 4 carbons as CO2
turns 2X (once for each pyruvate)produces 2 immediate ATP molecules per glucose molecule
Electron transport chainextracts energy from NADH & FADH2
passes electrons from higher to lower energy states
produces 32 or 34 molecules of ATP
Phases of Cellular Respiration
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Electron transportchain andchemiosmosis
Mitochondrion
4 ADP
2
4 ATP total
net gain
2 ATP
Glycolysis
NADH
glucose pyruvate
Cytoplasm
ATP
e–
e–e–e–
e–
2 ATP
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Preparatory reaction
NADH
NADH andFADH2
Electron transportchain andchemiosmosis
Mitochondrion
2
4 ATP total
net gain
2 ATP
Glycolysis
NADH
glucose pyruvate
Cytoplasm
ATP
e–
e–
e–
2 ATP
e–
e–
e–
4 ADP
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Mitochondrion
Citric acid cycle
Preparatory reaction
2 ADP 2
NADH
Glycolysis
NADH
glucose pyruvate
Cytoplasm
ATP2
4 ATP total
net gain
2 ATP
ATP
2 ATP
4 ADP
Electron transportchain andchemiosmosis
NADH andFADH2
e–
e–
e–
e–
e–
e–
e–
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Mitochondrion
Preparatory reaction
2 32 ADPor 34
32or 34
NADH
Glycolysis
NADH
glucose pyruvate
Cytoplasm
ATP
e–
e–
e–
e–
e–
e–
e–
Citric acid cycle
Electron transportchain andchemiosmosis
NADH andFADH2
2
4 ATP total
net gain
2 ATP
ATP
2 ATP
4 ADP
ATP2 ADP
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Glucose Breakdown: Glycolysis
in cytoplasm Energy Investment Steps:
2 ATP are used to activate glucose Glucose splits into 2 G3P molecules
Energy Harvesting Steps: oxidation of G3P occurs by removal of e- and H+
2 e- and 1 H+ are accepted by NAD+ resulting 2 NADH
4 ATP produced by substrate-level phosphorylation
net gain:- 2 ATP both G3Ps converted to pyruvates
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glucose
Glycolysis
3PG
BPG
G3P glyceraldehyde-3-phosphate
1,3-bisphosphoglycerate
3-phosphoglycerate
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ATP
ADP
ATP
ADP
PPTwo ATP are used to get started.
Energy-investment Step
glucose
ATP
Glycolysis
3PG
BPG
G3P glyceraldehyde-3-phosphate
21,3-bisphosphoglycerate
3-phosphoglycerate
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ATP
ADP
ATP
ADP
PP
P P
Two ATP are used to get started.
Splitting produces two3-carbon molecules.
Energy-investment Step
glucose
G3P G3P
ATP
Glycolysis
3PG
BPG
G3P glyceraldehyde-3-phosphate
21,3-bisphosphoglycerate
3-phosphoglycerate
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NAD+
NADHNADH
ATP
ADP
ATP
ADP
PP
P
P PP
P
PP
P
NAD+
Two ATP are used to get started.
Splitting produces two3-carbon molecules.
Oxidation occurs as NAD+
receives high-energy electrons.
Energy-investment Step
Energy-harvesting Steps
glucose
G3P
BPG
G3P
BPG
ATP
Glycolysis
3PG
BPG
G3P glyceraldehyde-3-phosphate
21,3-bisphosphoglycerate
3-phosphoglycerate
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NAD+
NADHNADH
ATP
ADP
ATP
ADP
ATP
ADP
ATP
ADP
PP
P
P PP
P
PP
P P
P
NAD+
Two ATP are used to get started.
Splitting produces two3-carbon molecules.
Oxidation occurs as NAD+
receives high-energy electrons.
Substrate-level ATP synthesis.
Energy-investment Step
Energy-harvesting Steps
glucose
G3P
BPG
G3P
BPG
3PG 3PG
ATP
ATP
Glycolysis
3PG
BPG
G3P glyceraldehyde-3-phosphate
2
2
1,3-bisphosphoglycerate
3-phosphoglycerate
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NAD+
NADHNADH
ATP
ADP
ATP
ADP
ATP
ADP
ATP
ADP
PP
P
P PP
P
PP
P P
P
PP
NAD+
Two ATP are used to get started.
Splitting produces two3-carbon molecules.
Oxidation occurs as NAD+
receives high-energy electrons.
Substrate-level ATP synthesis.
Oxidation occurs by removalOf water
Energy-investment Step
Energy-harvesting Steps
glucose
G3P
BPG
G3P
BPG
PEP PEP
3PG 3PG
ATP
ATP
H2OH2O
Glycolysis
3PG
BPG
G3P glyceraldehyde-3-phosphate
2
2
1,3-bisphosphoglycerate
3-phosphoglycerate
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NAD+
NADHNADH
ATP
ADP
ATP
ADP
ATP
ADP
ATP
ADP
ATP
ADP
ATP
ADP
PP
P
P PP
P
PP
P P
P
PP
NAD+
Two ATP are used to get started.
Splitting produces two3-carbon molecules.
Oxidation occurs as NAD+
receives high-energy electrons.
Substrate-level ATP synthesis.
Oxidation occurs by removalof water.
Two molecules of pyruvate arethe end products of glycolysis.
Energy-investment Step
Energy-harvesting Steps
pyruvate
glucose
BPG
G3P
BPG
PEP PEP
3PG 3PG
pyruvate
ATP
(net gain)
2
H2OH2O
Glycolysis
3PG
BPG
G3P
2
2
Substrate-level ATP synthesis.
glyceraldehyde-3-phosphate
1,3-bisphosphoglycerate
3-phosphoglycerate
ATP
ATP
ATP2
G3P
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Glycolysis: Inputs and Outputs
Glycolysis
inputs outputs
2 pyruvate
NADH
net gain
glucose
2 NAD+
2
2
4 ADP + 4
ATP
ATP
P
2
2 ADP
4 ATP + TOTAL
2
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Net product: 2 ATP 2 NADPH2 : enter electron
transport chain
2 pyruvate : enter Krebs cycle
Glucose Breakdown: Glycolysis
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Pyruvate pivotal metabolite end product of glycolysis
if O2 is not available to the cell, fermentation, an anaerobic process, occurs in the cytoplasm. during fermentation, glucose is incompletely
metabolized to lactate, or to CO2 and alcohol (depending on the organism).
If O2 is available to the cell, pyruvate enters mitochondria by aerobic process.
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The Preparatory (Prep) Reaction occurs before citric acid cycle
connects glycolysis to the citric acid cycle end product of glycolysis (pyruvate) enters
the mitochondrial matrix pyruvate converted to 2-carbon acetyl group
attached to Coenzyme A to form acetyl-CoA e- picked up (as hydrogen atom) by NAD+
CO2 released, and transported out of mitochondria into the cytoplasm
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Preparatory Reaction
2 NAD+ 2 NADH
2 2 + 2 CoA + 2 CO2
2 pyruvate
O OHC
CH3
+ 2 CoA
CoA
CH3
pyruvatecarbondioxideacetyl CoA
C OC O
2 acetyl CoA + 2 carbondioxide
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Citric acid cycle/Krebs cycle occurs in mitochondria matrix
O2 needed breakdown pyruvate and form H atom
for electron transport chain H carried by NAD and FAD ATP formed by substrate-level
phosphorylation turns twice for one glucose molecule. produces 4 CO2, 2 ATP, 6 NADH and 2
FADH2 (per glucose molecule)
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The Citric Acid Cycle
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inputs outputs
4 CO2
NADH
FADH22
2 acetyl groups
6 NAD+
2FAD
2
Citric acid cycle
P2ADP +
6
ATP
Citric Acid Cycle: Inputs and Outputs
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Electron Transport Chain
also known cytochrome or respiratory chain
eukaryotes: mitochondria cristae aerobic prokaryotes: plasma
membrane series of carrier molecules: coenzyme and cytochromes receives electrons from NADH & FADH2
pass H to other carriers down energy gradient
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Electron Transport Chain
H atom split into proton and electron only electrons are transferred energy rich electrons passed
successively from one to another produce ATP by oxidative
phosphorylation O2 serves as a final electron
acceptor O2-combines with H+ to form H2O
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Electron Transport Chain
1 NADH + H+ form 3 ATP 1 FADH2 forms 2 ATPs Recycling of coenzymes increases
efficiency once NADH delivers hydrogens, it returns
(as NAD+) to pick up more hydrogens hydrogens must be combined with O2 to
make H2O O2 not present, NADH cannot release H no longer recycled back to NAD+
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Electron Transport Chain
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Glucose Catabolism: Overall Energy Yield
Net yield per glucose: From glycolysis – 2 ATP
From citric acid cycle – 2 ATP
From electron transport chain – 32 ATP
Energy content: Reactant (glucose) 686 kcal
Energy yield (36 ATP) 263 kcal
Efficiency 39%; balance is waste heat
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Cyt
op
lasm
Mit
och
on
dri
on
Ele
ctro
n t
ran
spo
rt c
hai
n
2net
2
glucose
2 pyruvate
2 acetyl CoA
Citric acidcycle
subtotal subtotal
glycolysis
2 CO2
4 CO2
NADH
NADH
NADH
FADH2
2
2
6
2
4 or 6
6
18
4
324
36 or 38total
6 O2 6 H2O
ATP
ATP
ATP
ATP
ATP
ATP
ATP
ATP
ATPor 34
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Process Location Input Output (per glucose)
Glycolysis Cytoplasm Glucose 2 Pyruvic acid, 2 NADH. 2 ATP
Krebs cycle Mitochondria— inner space, (matrix)
2 Pyruvic acid converted to 2 acetyl CoA
2 NADH+ (pyruvic acid conversion step), 6 NADH+, 2 FADH2, 2 ATP
Electron transport chain and oxidative phosphorylation
Mitochondria— inner membrane (cristae)
10 NADH, 2 FADH2
32 ATP (12 H2O)
Total: 36 ATP/glucose
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Fermentation
an anaerobic process
produces limited amount of ATP
reduces pyruvate to either lactate or
alcohol and CO2
NADH passes its electrons to pyruvate
generate NAD+
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2 NAD+
2
ATP
2
4 ADP
2 ADP
P
2 P
2 P
2
2
P
glucose
G3P
BPG
pyruvate
or 2 lactate 2 alcohol
2CO2(net gain)
ATP
+4 4
2
or
ATP
NADH
ATP
2
ATP
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Fermentation Advantages
provides a quick burst of ATP energy for muscular activity.
Disadvantages lactate is toxic to cells. lactate changes pH and causes muscles to
fatigue. O2 debt and cramping
Efficiency of Fermentation 2 ATP produced per glucose of molecule during
fermentation is equivalent to 14.6 kcal.
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Efficiency of Fermentation
Fermentation
P ATP2 ADP + 2 2 net gain
input
glucose
outputs
2 lactate or
2 alcohol and 2 CO2
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Metabolic Pool: Catabolism Foods:
sources of energy rich molecules CHO, fats, and proteins
Catabolism: degradative reactions break down molecules tend to be exergonic
Anabolism: synthetic reactions build molecules tend to be endergonic
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Electrontransportchain
proteins carbohydrates fats
aminoacids
glucose fattyacids
glycerol
acetyl CoA
Glycolysis
pyruvate
ATP
ATP
ATP
Citric acidcycle
ETC