Chapter 7 Lecture Flashcards
How do heterotrophs survive?
By eating organic compounds produced by other organisms
What are autotrophs able to do?
Produce their own organic molecules through photosynthesis
How is cellular respiration used?
Extraction of energy from organic molecules
What is oxidation?
Loss of electrons
Dehydrogenations
Lost electrons are accompanied by protons
Redox reaction
Electrons carry energy from one molecule to another
NAD+
- an electron carrier
- accepts 2 electrons and 1 proton to become NADH
- reaction is reversible
Aerobic respiration
Final electron receptor is oxygen
Anaerobic respiration
Final electron acceptor is an organic molecule (not oxygen)
What are the 4 stages of the oxidation of glucose?
- Glycolysis
- Pyruvate oxidation
- Krebs cycle (or citric acid)
- Electron transport chain and chemiosmosis (oxydative phosphorylation)
What stage of glucose oxidation occurs in the cytoplasm?
Glycolysis
What stages of glucose oxidation occurs in the mitochondria?
- pyruvate oxidation
- Krebs cycle
- electron transport chain and chemiosmosis
What does glycolysis do?
Breaks sugar apart
What happens in pyruvate oxidation?
Loss of electrons; electrons go to NADH
What is the same as citric acid?
Citrate