Chapter 3.docx

Chapter 3 questions & answers What three parts can the cell be subdivided into? Plasma Membrane, Cytoplasm, Nucleus Which property does does not accurately fit the cellmembrane? Selectively permeable Contains cytoplasm Rigid Contains embedded proteins Describe the functions of the cell memb...

Chapter 3 questions & answers What three parts can the cell be subdivided into? Plasma Membrane, Cytoplasm, Nucleus Which property does does not accurately fit the cellmembrane? Selectively permeable Contains cytoplasm Rigid Contains embedded proteins Describe the functions of the cell membrane. Contains organelles, maintains structure, helps keep intracellular space and extracellular space separate How do small non-polar molecules pass through a cell membrane? Diffusion How do small polar molecules pass through the cell membrane? Channels / Transporters How do macromolecules pass through a cell membrane? Vesicles What two things make up an electrochemical gradient? Concentration Gradient and Electrical Gradient What is diffusion? Movement of substances from high to low concentration What is active transport? Movement of substances from low to high concentration, using atp If a cell swells, describe the tonicity of the cell. Hypertonicity Isotonicity Hypotonicity None of the above If a cell shrivels up, describe its tone. Hypertonicity Isotonicity Hypotonicity None of the above How does aging affect cells? Our cells deteriorate and they lose the ability to respond to environmental stress. Numbers decrease, and extracellular tissues lose their integrity. Free radicals damage cells and cellular structures. How do body cells reproduce? Mitosis - Cellular division. How do sex cells reproduce? How many cycles are there? Meiosis. There are two cycles.