Lecture 6 - Cellular respiration Flashcards
Which type of cells do photosynthesis occur in?
Plant cells
Which type of cells do cellular respiration occur in?
Plants and animal cells
What are the four reasons why cells need energy?
- Mechanical work
- Making new materials
- Transport
- Maintaining order
What are two important compartments for respiration?
Matrix and inner membrane
What does this equation represent?
(Glucose + Oxygen –> Carbon dioxide + Water + ATP)
Conversion of chemical energy
T or F
The number of mitochondria is fixed in a cell
False, depends on energy
demand
What is the structure of mitochondria?
- Two membranes (inner and outer)
- Ribosomes
- Cristae
What are the three stages of cellular respiration?
Stage 1 - Glycolsis
Stage 2 - Pyruvate Oxidation & Citric Acid Cycle
Stage 3 - Oxidative Phosphorylation
Where does glycolsis occur?
In the cytosol
What does glycolsis do?
Sugar/glucose (6C) is converted into two pyruvate molecules.
6C -> 2 x 3C
This generates 2ATP and 2 NADH (high energy electrons)
Where does Pyruvate Oxidation & Citric Acid Cycle occur?
In the mitochondria matrix
What do Pyruvate Oxidation & Citric Acid Cycle do?
- 2 pyruvate molecules (2 x 3C) are
converted to 2 Acetyl CoA
molecules. - 2 Acetyl CoA molecules
enter the citric acid cycle - Output are ATP, NADH &
FADH2
Where does Oxidative Phosphorylation occur?
In the inner membrane of the mitochondrion
What are the two parts of Oxidative Phosphorylation?
- Electron transport (electrons from
NADH and FADH2) - Chemiosmosis (ATP production)
How is a proton gradient generated in Oxidative Phosphorylation?
As the electron carriers (NADP and FADH2) move, protons (H+) are pumped across the membrane into the inter-membrane space