Bioenergetics II

Question 1

What is ATP?

Answer 1

One of the most common molecules involved in energy transfer - energy currency of cell.

Question 2

Examples of nucleotides.

Answer 2

Cytidine - Lipid
Uridine - Carbohydrate
Adenosine - Energy carrier
Guanosine - Transmembrane signalling

Question 3

Describe the muscle contraction process.

Answer 3

Calcium ions binds to protein complex
high energy myosin head bridges gap forming cross bridges.
myosin binds to actin and Pi is released
myosin conformational change - lower energy state
myosin expands energy and moves through power stroke pulling acid filament toward M-line.
sarcomere shortens - muscle contracts
end of power stroke - myosin in ow energy position
ADP released - cross bridges still in place
ATP bind to myosin - myosin high energy state - releasing head from actin active site
ATP attach to myosin - cross bridges cycle starts again