Cholesterol is indeed necessary for life - it is an essential component of cell membranes, and a precursor for steroid hormones, vitamin D and bile acids. Fortunately we can manufacture it in our livers.
What makes you think it transports essential amino acids?
Sorry, i should have said fatty acids. Amino acids transfer in the blood plasma.
I had been reading about LDL, and I think I got confused by the following description:
LDLs are cholesterol-rich particles. About 70% of plasma
cholesterol occurs in this form. LDLs are chiefly involved in
the transport of the cholesterol manufactured in the liver to
the tissues, where it is used. Uptake of cholesterol into cells
occurs when lipoprotein binds to LDL receptors on the cell
surface. LDL is then taken into the cell and broken down
into free cholesterol and amino acids
In other words, cholesterol provides the material for the cells to synthesise amino acids. Of course, the 9 essential amino acids cannot be synthesised, and have to be eaten in the diet. These are metabolised into the blood directly, and do not need a receptacle to carry them. Many of the 23 amino acides are involved in the glucogen pathway.