Unit Exam - Characteristics of Living Things
Cell Membrane
Proteins embedded in the cell membrane serve various functions. Protein channels allow specific molecules to pass through the membrane, facilitating their entry or exit from the cell. Protein pumps actively transport molecules across the membrane, using energy to move substances against their concentration gradient.
Additionally, carbohydrates attached to proteins on the cell membrane act as identification markers, allowing cells to recognize each other and coordinate their activities.
What is the main responsibility of protein pumps attached to the cell membrane?
extra support for the cell exterior
keeping cell turgidity at normal levels
moving molecules against their concentration gradient
