Summary Cellular respiration and photosynthesis study Guide

BIOLOGY STUDY PHOTOSYNTHESIS AND
CELLULAR RESPIRATION
Cellular respiration:
the process of turning food into energy (ATP)
Equation of cellular respiration:




6602 6H20 ATP
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Aerobic respiration: uses oxygen/ produces 36-38 ATP

Anaerobic respiration: does not use oxygen/ 2-4 ATP and 2 NADH

The overall goal of cellular respiration is to create energy that we can use.



Step 1: Glycolysis

Glycolysis: breaking down of glucose

Key events:
1. Gets 2 phosphates from ATP, making a new molecule
2. New molecule splits into 2 smaller ones
3. As the smaller molecules get processed, they create ATP and NADH
4. Final product: pyruvate

Occurs in: Cytoplasm

Anaerobic




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Reactants used:
Cottied

Gets split into 2 3-carbon molecules called pyruvate
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This reaction releases: 2 ATP and 2 NADH
Moves to next stage: 2 pyruvate molecules


Step 2: Krebs Cycle (aerobic) / Fermentation (anaerobic)
The next step of cellular respiration is a decision. After glycolysis, the cells decides what to do next. If there is oxygen
available, the Krebs cycle begins. I f there is no oxygen available, fermentation begins.

Step 2 path A: (OXYGEN ABSENT) Fermentation
Type 1 of fermentation: Lactic Acid Fermentation

Occurs in organisms like: some bacteria and animal cells (like our muscles)