Use this corrected key to study, not just to copy. When you understand why a lysosome is a recycling center and why mitochondria have folded membranes, you aren't just passing a test—you are learning the language of life itself.

Here are answers to the three hardest short-answer questions from Section 7-2, for accuracy.

No ribosomes; it's where lipid components of the cell membrane are assembled and toxic substances are broken down.

Proteins are made on the: a) Smooth ER b) Ribosomes c) Golgi d) Lysosomes