Question

Low density lipoprotein (LDL) brings _______ into the cell where it can be incorporated into cell membranes.

1) Proteins
2) Carbohydrates
3) Lipids
4) Nucleic acids

Answer 1

LDL carries cholesterol, which is a type of lipid, into cells for incorporation into their membranes, hence option 3) Lipids is the correct answer.

Step-by-step explanation:

Low-density lipoprotein (LDL) brings cholesterol into the cell where it can be incorporated into cell membranes. Thus, the correct answer to the student's question is 3) Lipids. Lipids are insoluble in water and are transported in the bloodstream complexed with proteins, forming structures known as lipoproteins. LDL, often referred to as 'bad cholesterol', carries cholesterol from the liver to the tissues throughout the body. Inside the cell, cholesterol from LDL can be used for building cellular membranes, synthesis of steroid hormones, or may contribute to plaque formation on arterial walls if present in high levels.