The calcium ATPase:
- is much simpler than the sodium-potassium pump because it has only three transmembrane regions.
- pumps 15 calcium ions for each molecule of ATP consumed.
- uses the same intracellular domain for both nucleotide binding and ion translocation.
- pumps calcium in a cyclical process that utilizes energy from ATP.
- is unique among transporters in that its pumping action involves no conformational changes
Answer: 4