Resp

Question 1

Mitochondria structure to function

Answer 1

1. Small size
2. Outer membrane
3. Outer and inner membrane
4. Inner membrane
5. Matrix

Question 2

Mitochondria size to function

Answer 2

Small size

↑ SA:V = efficient diffusion of respiratory intermediates and ATP between cytoplasm and mitochondria + easier movement in cell to areas where ↑ energy demand

Question 3

Mitochondria outer membrane.

Answer 3

Outer membrane

Compartmentalisation → separate contents of mitochondria from cytoplasm
- ✓ specialised metabolic pathways occur inside mitochondria in optimal conditions
- ✓ regulate passage of substances in and out of mitochondria
○ Entry of pyruvate and O2, exit of ATP

Contains membrane proteins that function to shuttle H from NADH in cytoplasm to NAD in mitochondrial matrix (NAD ✕ pass through membrane)

Question 4

Mitochondria outer and inner

Answer 4

Outer and inner membranes

Enclose inter membrane space + impermeable to H+ = ✓ accumulate H+ in inter membrane space = generate proton gradient and PMF

Question 5

Mitochondria inner

Answer 5

Inner membranes

Attachment of e- carriers onto membrane → arrangement in specific order of progressively ↓ energy level to form ETC

✓ attachment of ATP synthase that catalyses ATP synthesis

Infolding into Cristae = ↑ SA of inner membrane
- ↑ e- carriers attached = ↑ ETC + ↑ ATP synthase attached
- ↑ accessibility of NADH and FADH2 to ETC

Contains specific protein channels (pyruvate translocase) for movement of specific materials → selectively permeable
Permeable to O2 and ATP

Question 6

Mitochondria matrix

Answer 6

Matrix

Contains enzymes that catalyse reactions in link rxn and Krebs cycle + fatty acid β-oxidation

Contains mitochondrial DNA, RNA and ribosomes involved in synthesis of certain mitochondrial proteins