Final answer:
Among the options provided to compare the functions of proteins and lipids in a human cell, the correct statement is:
b. proteins catalyze chemical reactions inside the cell. Lipids allow for the transport of certain molecules into and out of the cell.
Step-by-step explanation:
The correct answer is b. Proteins catalyze chemical reactions inside the cell, while lipids allow for the transport of certain molecules into and out of the cell. Proteins have various functions in a cell, including acting as enzymes, hormones, and structural components. They play a crucial role in catalyzing chemical reactions inside the cell. Lipids, on the other hand, serve as barriers and allow for the transport of certain molecules across the cell membrane. They are involved in the transport of cholesterol, hormones, and other lipids.