Lipoproteins like ldl and hdl transport lipids and proteins through the bloodstream. receptors on cells can bind to the lipoproteins and remove them from the blood, using the lipids for energy and to produce membranes. which of the following mechanisms would be used to move a lipoprotein into a cell?

The correct answer is receptor mediated endocytosis.

Explanation:

Every cell has receptors present on their cell surface which binds to messenger molecules reached to it through circulation.  

Lipoproteins like LDL and HDL transport lipids and proteins through the bloodstream to the target cell and bind to their receptor. Binding of these substance cause conformational changes in the receptor which cause internalization of the receptor with ligand in the form of vesicle.

Then these vesicles are transported to the lysosome which lyse the vesicle and release the lipids for energy and to produce membranes. This process is called receptor-mediated endocytosis.