Question

As they both belong to the P-class pumps, Ca2+ ATPase on the sarcoplasmic reticulum membrane and Na+/K+ ATPase on the plasma membrane should share the following properties EXCEPT

A. An ATP-binding site.
B. A phosphorylated intermediate.
C. Conformational changes during transport.
D. transporting H+ across the membrane.

Answer 1

The Ca2+ ATPase and Na+/K+ ATPase share many properties as P-class pumps, including having an ATP-binding site, a phosphorylated intermediate, and experiencing conformational changes, but they do not transport H+ ions. the correct option is A. An ATP-binding site.

Step-by-step explanation:

Ca2+ ATPase on the sarcoplasmic reticulum membrane and Na+/K+ ATPase on the plasma membrane :

The Ca2+ ATPase on the sarcoplasmic reticulum membrane and Na+/K+ ATPase on the plasma membrane share several properties as P-class pumps, except for transporting H+ across the membrane. This is because Na+/K+ ATPase and Ca2+ ATPase are specialized in transporting Na+, K+, and Ca2+ ions, respectively, not H+ ions.

They both have an ATP-binding site, undergo conformational changes during transport, and have a phosphorylated intermediate. However, one property that the Na+/K+ ATPase has but the Ca2+ ATPase does not is transporting H+ ions across the membrane.

Both the Na+/K+ pump and Ca2+ ATPase have an ATP-binding site, phosphorylated intermediate, and undergo conformational changes during the transport process. However, unlike H+ ATPase, which specifically transports hydrogen ions, these pumps do not have a functionality to actively move H+ ions across the membrane.