Cell Physiology Questions and Answers

Define the basic structural and functional unit of life Ans- Cell All living organism are composed of Ans- Cells How many cells are in the human body? Ans- 50 to 100 trillion What are the three main regions of the cell? Ans- Plasma Membrane, Cytoplasm, Nucleus What is the thin and flexible membrane of the cell which separates the intracellular from extracellular fluid? Ans- Plasma Membrane What is another name for the Plasma Membrane Ans- plasmalemma What are three things the membrane is composed of and what is embedded in the membrane? Ans- Double layer of lipids; phospholipids, cholesterol, glycolipids; proteins are embedded What is the most abundant lipid in the plasma membrane? Ans- phospholipids The heads of phospoholipids are (Hydrophilic/hydrophobic) Ans- Hydrophilic The tails of phospholipids are (Hydrophilic/hydrophobic) Ans- Hydrophobic What are the two types of membrane proteins? Ans- Integral and Peripheral What are the most abundant proteins in the membrane? (Most are transmembrane but some protrude from one side of the membrane) could act as a receptor