17.1 Energy cycles Flashcards
1
Q
Through what process is ATP produced in photosynthesis?
A
Chemiosmosis
2
Q
Define chemiosmosis.
A
Diffusion of proton from high concentration to low concentration through a selectively permeable membrane
3
Q
How does the movement of protons in chemiosmosis result in ATP synthesis?
A
Movement of protons down concentration gradient releases energy used in attachment of inorganic phosphate to ADP, forming ATP
4
Q
What has to be created for chemiosmosis to occur?
A
A proton gradient
5
Q
What are the 2 ways in which electrons are excited?
A
- Electrons in pigments are excited by absorbing energy from sunlight
- Excited electrons are released when chemical bonds are broken in respiratory substrate molecules
6
Q
After an electron has been excited, where does it go?
A
Enter the ETC and are used to generate a proton gradient
7
Q
What is an electron chain made up of?
A
A series of electron carriers, each with progressively lower energy levels
