anaerobic respiration 2

Download Anaerobic respiration 2

Post on 11-May-2015

1.871 views

Category:

Education

2 download

Embed Size (px)

DESCRIPTION

tugas biologinya bu henri hehe :p

TRANSCRIPT

  • 1.Anaerobic respiration
    Respiration without oxygen

2. 3. 2 different types of Respirationmake up all of Cellular Respiration
4. What happens if there is no available electron acceptor?
Glucose
2 ADP
2 NAD+
glycolysis
2 ATP
2 NADH
2 pyruvate
Aerobic respiration: The NADH then passes its high energy e- to the
electron transport chain (becoming NAD+ again) and eventually to O2
Anaerobic respiration: Without O2, NADH has nowhere to donate its e- to, NAD+ cannot be regenerated, and glycolysis stops
5. Anaerobic respiration
With no oxygen oxidative phosphorylation and Krebs cycle cannot take place. (Cells without mitochondria cannot respire aerobically e.g. red blood cells)
In anaerobic respiration glycolysis takes place as usual yielding pyruvate and a small amount of ATP.
If pyruvate levels were allowed to build up it stop glycolysis and inhibit ATP production, also the reduced NAD produced must be oxidised back or else the cell would run out of it again stopping ATP production.
6. Process of Cellular Respiration
7. Anaerobic respiration
All living organisms break down sugars to get energy. In humans this breakdown usually occurs with oxygen.
8. 25
energy
C6H12O62C2H5OH + 2CO2
glucose alcohol
Anaerobic respiration can be represented by the equation
The energy released by anaerobic respiration is considerably
less than the energy from aerobic respiration.
Anaerobic respiration takes place at some stage in the cells
of most living organisms.
For example, our own muscles resort to anaerobic respiration when oxygen is not delivered to them fast enough.
9. Micro-organisms
26
Anaerobic respiration is widely used by many micro-organisms
such as bacteria and yeasts.
Bacteria and yeasts are microscopic single-celled organisms.
Bacteria are to be found everywhere, in or on organisms,
in water, air and soil
Yeasts are usually found in close association with vegetable matter such as fruit
10. 1. In Muscle Cells - During extraneous
activities, the oxygen in the muscle tissue is
decreased to an extent that aerobic
respiration does not occur at a sufficient
rate. Hence, there is a buildup of lactic acid
and your muscles get tired
2. In Yeast - The fermentation end product is
ethyl alcohol, and CO2
11. Anaerobic respiration
glucose
Producing ethanol from pyruvate regenerates oxidised NAD and allows glycolysis to continue
triosephosphate
oxidised
NAD
reduced
NAD
pyruvate
reducedoxidised
NADNAD
ethanal ethanol
alcohol dehydrogenase
12. Anaerobic respiration
glucose
Producing lactate from pyruvate regenerates oxidised NAD and allows glycolysis to continue
triosephosphate
oxidised
NAD
reduced
NAD
pyruvate
reducedoxidised
NADNAD
lactate
lactate
dehydrogenase
13. Anaerobic respiration
First CO2 is removed from pyruvate to produce ethanal.
Alcohol dehydrogenase converts ethanal to ethanol by adding hydrogen taken from reduced NAD.
Process used by humans for many thousands of years to produced risen breads and alcohol for drinking.
14. Anaerobic Respiration refers to the
oxidation of molecules in the
absence of oxygen to produce energy
It is also known
As Fermentation
15. Anaerobic fermentation
Fermentation: An alternative set of reactions that can follow glycolysis in the absence of oxygen as a final electron acceptor.
Extremely inefficient: no Krebs cycle, no ETC.Glycolysis produces a net of 2 ATPs per glucose molecule
16. FERMENTATION PATHWAYS ALLOWS CELLS TO REGENERATE NAD+FOR GLYCOLSIS
Fermentation
by-product
Intermediate accepts
electrons from NADH
2 NAD+
2 NADH
2
Pyruvate
Glucose
2 ATP
2 ADP
17. 2 types of fermentation
Fermentation
Lactic Acid Fermentation
Alcohol Fermentation
18. 2 types of fermentation
19. LACTIC ACID FERMENTATION OCCURS IN HUMANS
Pyruvate accepts
electrons from NADH
2 NAD+
2 Lactate
2 NADH
Glucose
2 ATP
2 ADP
2 Pyruvate
20. ALCOHOL FERMENTATION OCCURS IN YEAST
2 CO2
2 Acetylaldehyde
2 Ethanol
2 NAD+
2 NADH
Glucose
2 ATP
2 ADP
2 Pyruvate

Recommended

View more >