I. Where does cellular respiration take
place?
In the mitochondria.
The mitochondria is a double-membrane structure. The folded
inner-membranes
are called cristae and the fluid within the membrane is
called
the matrix.
II. What is the purpose of cellular
respiration?
To convert chemical
energy
into the chemical energy of ATP. Organisms can only use ATP
energy.
III. What are the steps in cellular
respiration?
1. Anaerobic
respiration-
Glycolysis-
a. takes place in the cytoplasm
b. breaks the glucose molecule in half
c. requires 2 ATP for activation energy
d. produces 4 ATP, for a net gain of 2 ATP
e. converts glucose to pyruvic acid (pyruvate)
f. some hydrogens are removed and taken to the ETC
e. does not require oxygen
f. these are the primary reactions in fermentation
g. Fermentation
2. Aerobic
respiration
a. takes place in the mitochondria
b. requires oxygen
c. Steps:
1. Conversion of pyruvate to acetyl CoA- if oxygen is
available,
pyruvate enters the mitochondria
2. Krebs
Cycle- break down of the carbon chain- takes place
in the matrix
3. Electron
Transport Chain- (chemiosmosis)-
a. movement of electrons down a gradient to yield energy
b. takes place on the cristae
4. Oxydative
Phosphorylation- formation of ATP molecules
using the energy from ETC
5. Animated links:
a. Mitochondrial
electron transport
b. ATP
synthase
c. ATP
synthase catalytic mechanism
Links:
1. How Exercise Works
2. Aerobic
Respiration
3.
Cellular Respiration Overview
4. Extracting
Energy From Glucose
5. Game: Glycolysis
Battleship
RETURN TO MRS. PELLEGRINI'S BIOLOGY HOMEPAGE
©1998 Linda Pellegrini. All rights reserved.