Respiration (CQC) Flashcards
What is energy?
The ability to work
What can you do with ATP?
- Muscle contraction
- Active transport
- Mitosis
- Glycolysis (in respiration)
- Endocytosis and exocytosis
- Phosphorylates other molecules to make them more reactive
How does ATP release energy?
When ATP is hydrolysed energy is released. To synthesise more ATP, energy is needed.
Why is ATP useful in biological processes?
- Releases energy in small amounts
- Adds a phosphate group to other phosphate molecules, lowering the activation energy of a reaction
- It is easily reformed
- Can not pass out of cells
- Broken down in a one-step reaction so acts as a rapid energy source
what is the word equation for respiration?
Glucose + Oxygen → Carbon Dioxide + Water + 32 ATP
what is respiration?
It is the controlled release of energy from organic compounds to produce ATP. This ATP is then immediately available as a source of energy in the cell.
what are the two forms of respiration?
- Aerobic→ requires oxygen → larger yield of ATP from glucose
- Anaerobic→ does not require oxygen→ small yield of ATP from glucose
why is soda lime used in respirometers?
Soda lime (or an alkali) is used to absorb the carbon dioxide, this is used to indicate how much respiration is going on, as the volume of the respirometer will reduce when oxygen is used in respiration
why does temperature need to be kept constant in respirometers?
Temperature needs to be kept constant as it can affect the activity of the enzymes in respiration
why is oxygen consumption used as a measure of metabolic rate?
- Oxygen is required for aerobic respiration
- Respiration produces ATP to release energy and produces heat
- Oxygen consumption is proportional to energy released and metabolic rate
what is the structure of a mitochondrion?
- outer mitochondrial membrane
- inner mitochondrial membrane
- cristae
- matrix
- inter-membrane space
what is the outer mitochondrial membrane?
Separates the contents of the mitochondria from the rest of the cell, creating ideal conditions for respiration
what is the inner mitochondrial membrane?
Contains the electron transport chains and ATP synthase. The energy lost by electrons as they move down the ETC provides energy to transport H+ ions into the inter-membrane space. H+ moving through ATP synthase provides the energy to convert ADP+ Pi → ATP
What are the cristae?
Projections of the inner membrane which increase the surface area for oxidative phosphorylation so more ATP can be produced
what is the matrix?
Converts enzymes for the Krebs Cycle and link reaction
what is the intermembrane space?
Energy lost by electron carriers is used to pump protons into this space. The concentration builds up quickly creating a proton gradient for chemiosmosis
where does glycolysis take place?
Cytoplasm
where does the link reaction take place?
the mitochondrial matrix