Which of the following statements about the smooth endoplasmic reticulum is/are correct?

liver cells are abundant in ser.
the testes and ovaries are tissue types whose cells are abundant in ser.
the ser is the primary location for synthesis of membrane-bound proteins.
cholesterol is made in the ser.
the luminal face of the ser is the main site at which membrane lipids are synthesized.
phospholipids are synthesized from cytosolic water soluble precursor molecules.
lipases are the enzymes that allow lateral movement of a lipid within a leaflet.

The correct answers are:

•Liver cells are abundant in SER.  

This is because liver cells contain enzymes that metabolize various lipid-soluble compounds.

•The testes and ovaries are tissue types whose cells are abundant in SER.

This is because testes and ovaries produce steroid hormones (cholesterol is the precursor for their synthesis).

•Cholesterol is made in the SER.  

ER is the organelle at which all membrane lipids are synthesized.

•Phospholipids are synthesized from cytosolic water soluble precursor molecules.  

Phospholipids are the main lipids that are the main structural components of the cell membrane. They are synthesized on the cytosolic side of the ER membrane, from water-soluble cytosolic precursors.

i don't know. the other person does though.

this protocol provides a detailed procedure for co-immunoprecipitation (co-ip) to identify protein–protein interactions.