AP BIOLOGY

Detailed explanation-1: -The nucleus, formed by a nuclear membrane around a fluid nucleoplasm, is the control center of the cell. Threads of chromatin in the nucleus contain deoxyribonucleic acid (DNA), the genetic material of the cell.

Detailed explanation-2: -The membrane determines what solutes enter and leave a cell. Transmembrane transport is controlled by complex interactions between membrane lipids, proteins, and carbohydrates.

Detailed explanation-3: -The cell membrane controls what moves in and out of the cell. Cell membranes only allow some solutes (solids) to move across it. Movement across the membrane depends on size and type of the solute (solid).

Detailed explanation-4: -The cell membrane controls the movement of substances in and out of cells and organelles, being selectively permeable to ions and organic molecules.