AP Biology Unit 2---the Cell Exam Questions with 100% Correct Answers

Cell Correct Answer basic functional unit of all living things Plasma membrane Correct Answer bounds the cell and encloses the nucleus and cytoplasm. separates internal metabolic events from the external environment and controls the movementof materials into and out of the cell. Double phospholipid membrane. (hydrophilic heads forming the two outer faces and the nonpolar hydrophobic tails pointing toward the inside) Selectively permeable Cytoplasm Correct Answer consists of organelles suspended in a fluid matrix (cytosol) Peripheral proteins Correct Answer proteins attached to the inner or outer surface of the membrane Integral proteins Correct Answer proteins that extend to the inside of the membrane Channel Proteins Correct Answer provide open passageways through the membrane for certain substances Ion channels Correct Answer allow the passage of ions across the membrane Carrier Proteins Correct Answer bind to specific molecules, which are then transferred across the membrane Transport Proteins Correct Answer use energy (ATP) to transport materials across the membrane. Recognition proteins Correct Answer give each cell type a unique identification. Receptor proteins Correct Answer provide binding sites for hormones or other trigger molecules Cholesterol Correct Answer distributed throughout the phospholipid bilayer provide some rigidity to membrane of animal cells Nucleus Correct Answer Bound by nuclear envelope. contains DNA Nuclear Envelope Correct Answer two phospholipid bilayers enclosing the nucleus DNA Correct Answer Genetic information