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What type of protein serves to transport lipids within a cell?

  1. Glycoprotein

  2. Lipoprotein

  3. Steroid protein

  4. Structural protein

The correct answer is: Lipoprotein

Lipoproteins are the type of proteins that serve to transport lipids within a cell. Glycoproteins are proteins that have carbohydrate molecules attached to them and are involved in cell signaling and recognition. Steroid proteins and structural proteins are not involved in the transport of lipids within a cell, making them incorrect options. It is important to note that while the term "lipoprotein" may suggest a role in lipid synthesis, their actual function is to transport lipids within the cell. Therefore, B is the correct answer.