Fermentation (Anaerobic Cellular Respiration) B-3.2 STUDENT NOTES | Date:

Whe

n D

o C

ells

Use

Ana

erob

ic

Res

pira

tion?

Remember! Cellular Respiration occurs in 2 conditions: Aerobic: Anaerobic: A common anaerobic cellular respiration process is ___________________________________________. Which one produces much less ATP molecules than the other? Aerobic or Anaerobic (circle one)

Ferm

enta

tion

Two types:

• ____________________________________ fermentation

• ____________________________________ fermentation

Your cells cannot store large amounts of ___________________________ (O2) for cellular respiration. Usually, the amount of O2 you inhale when you breathe is enough for your cells to make ATP during

_______________________ activities like talking, sitting, walking at a normal pace, etc.

But what about when you are engaging in high levels of activity? If your cells don’t get energy, what happens? ___________________

Ferm

enta

tion

& G

lyco

lysi

s

Fermentation does not _________________________, but it allows ____________________________________ to continue.

• If no oxygen is present or cells run out of it, cellular respiration cannot take place to make more ATP.

Instead, _____________________ cells undergo __________________________________________________.

• This is what creates the “______________________” during hard exercise!

Page  ___  

Lac

tic a

cid

ferm

enta

tion

When does lactic acid fermentation occur? Lactic acid fermentation may occur in:

1.

2.

During lactic acid fermentation….. _________________________ à pyruvic acid à _________________________ + ATP Does lactic acid fermentation replace aerobic respiration? YES or NO (circle one) The reason is so that the cell can have a continual source of __________________________ even in the absence of _____________________________________. However this shift is only temporary and cells need oxygen for sustained activity. Lactic acid fermentation produces much less energy than aerobic respiration. The build up of lactic acid in muscle tissue can cause what feeling?

Alc

ohol

ic fe

rmen

tatio

n

What organisms complete alcohol fermentation? During alcohol fermentation, pyruvic acid formed during glycolysis is broken down into what?

Alcoholic fermentation looks like this: ____________________________ à pyruvic acid à alcohol and _______________________________ à ATP ______________________ are made for each round of alcoholic fermentation. Alcoholic fermentation uses:

• Yeast – it is added to bread or dough to make it rise. o When yeast undergoes alcoholic fermentation, it produces CO2 which causes bubbles in the

dough, making it rise. o Baking bread kills the yeast, and the alcohol evaporates.

• Bacteria that rely on fermentation play an important role in our digestive systems – without them, you couldn’t fully digest your food.

o Bacteria continue to break down food molecules for themselves. o This additional breakdown allows the host (you!) to absorb more nutrients from food.