Question

which statement best compare a function of proteins and lipids in a human cell?
(a) proteins provide energy for cellular processes. lipids catalyze chemical reactions inside the cell.
(b) proteins catalyze chemical reactions inside the cell. lipids allow for the transport of certain molecules into and out of the cell.
(c) proteins allow for the transport of certain molecules into and out of the cell. lipids store genetic information for cells.
(d) proteins store genetic information for cells. lipids provide energy for cellular processes.

Explanation:

Enzymes, which are proteins, catalyze chemical reactions in the cell. Lipids, especially phospholipids in the cell - membrane, allow for the transport of certain molecules into and out of the cell. Proteins do not primarily provide energy for cellular processes (carbohydrates and lipids are more common for energy - provision), lipids do not catalyze chemical reactions (enzymes do), and nucleic acids store genetic information, not proteins or lipids.

Answer:

B. Proteins catalyze chemical reactions inside the cell. Lipids allow for the transport of certain molecules into and out of the cell.