33.
Determine the correctness or otherwise of the following Assertion [A] and the Reason [R] regarding mammalian cells.
Assertion [A]: Cells use Ca2+ and not Na+, for cell to-cell signaling.
Reason [R]: In the cytosol, concentration of Na+ is lower than that of Ca2+

36.
Which one of the following statements regarding G proteins is incorrect?

37.
If serum is removed from the growth medium of human embryonic kidney cell line (HEK), then the cells will