ANATOMY BIO 251Quiz 2

ANATOMY BIO 251Quiz 2 Question 1.1. What are the nonpolar parts of phospholipids? (Points : 3) Phosphate-containing head groups Fatty acid tail groups Both the head and tail groups are nonpolar. Neither the head nor tail groups are nonpolar. Question 2.2. The polar portion of a cholesterol molecule, which forms hydrogen bonds with the polar heads of neighboring phospholipids and glycolipids, consists of a (Points : 3) –OH group. –CH3 group. –CH4 group. –COOH group. None of the above Question 3.3. This type of membrane protein anchors cells to neighboring cells and to protein filaments found outside or inside the cell. (Points : 3) Transporters Receptors Ligands Ion channels Linkers Question 4.4. Which of the following does NOT influence the rate of diffusion of a chemical across a plasma membrane? (Points : 3) Concentration gradient of the chemical across the membrane Mass of the diffusing chemical Distance that the chemical has to diffuse Amount of ATP available Temperature Question 5.5. If the solute concentration is greater inside of the cell than outside the cell, water will move by osmosis (Points : 3) into the cell. out of the cell. into and out of the cell at the same rate resulting in no net water movement. All of the above None of the above Question 6.6. Which of the following transport process uses vesicles formed at the plasma membrane to take up extracellular substances and import them into the cell? (Points : 3) Endocytosis Exocytosis Facilitated diffusion Osmosis Both endocytosis and exocytosis Question 7.7. During phagocytosis, binding of a particle to a plasma membrane receptor triggers formation of , which are extensions of the plasma membrane of the phagocyte that eventually surround the particle forming a phagosome. (Points : 3) podocytes exterior vesicles interior vesicles pseudopods lysosomes Question 8.8. This cellular organelle is comprised of a pair of centrioles and the surrounding pericentriolar material. (Points : 3) Cytoskeleton Cilia Centrosome Flagella Peroxisomes Question 9.9. Which of the following membrane-enclosed organelles contains several oxidases that are involved in oxidation of fatty acids and amino acids during normal metabolism and in detoxification of chemicals like alcohol in the liver? (Points : 3) Peroxisomes Mitochondria Proteasome Ribosomes Lysosomes Question 10.10. Which of the following membrane-enclosed organelles can engulf a worn-out organelle, digest its chemical components, and recycle those digested components? (Points : 3) Peroxisomes Mitochondria Proteasome Ribosomes Lysosomes Question 11.11. Briefly describe the fluid mosaic model. (Points : 5) Question 12.12. Briefly describe how proteins move through the Golgi complex. (Points : 5)