19. Which model currently describes the structure of the plasma t model B.fluid
ID: 206546 • Letter: 1
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19. Which model currently describes the structure of the plasma t model B.fluid nosac model C plasmagel-plasmasol model D. lock and key model E. induced-t 20. A short chai n of sugar attached to a protein molecule on the plasma membrane is called A.a protomembrane. B. a protosugar. C. a glycocalyx. D. a glycolipid. E. a glycoprotein 21. During a hurricane, salt water invades fresh water marshes causing many of the plants to die. The plants are to the plants, drawing water from their cells killed because the salt water solution is A. isotonic B. hypotonic C. mesotonic D. oligotonic E. hypertonic 22. What is the function of cholesterol in the plasma membrane? A. cell marker B. receptor C. support D. channel E. enzyme 23. Often when a person is admitted to the hospital, an intravenous solution of normal saline is begun. Since this does not harm the patient, what is the tonicity of normal saline compared to your blood? A. hypertonic B. isotonic C. hypotonic D. pretonic E. osmotonic 24. Which of the following does not utilize active transport? A. movement of oxygen from the lungs into blood B. concentrating iodine ions in the thyroid gland C. absorbing sugar in the gut D. water homeostasis in the kidneys E. movement of sodium and potassium in nerve cells Which of the following processes others? A. exocytosis B. phagocytosis C.pinocytosis D. receptor-mediated endocytosis E. endocytosis 25. moves large molecules across a membrane in the opposite direction of the 26. The nucleus of a cell in your thigh muscle contains the same genes as the nucleus of a cell in your brain. A FALSE. B. TRUE 27. Which organelle can be likened to a post office? A. nucleus B. nucleolus C. mitochondria D. endoplasn reticulum E. Golgi apparatusExplanation / Answer
19) The correct option is B. fluid-mosaic model.
Fuid-mosaic model explains the structure of plasma membranes. In this model, a flexible layer made of lipid molecules is interspersed with large protein molecules, which act as channels.
20) The correct option is E. a glycoprotein.
Glycoproteins are proteins, which contain oligosaccharide chains that are covalently attached to polypeptide side-chains.
21) The correct option is E. hypertonic.
A hypotonic solution, in which the concentration of solutes is greater inside the cell than outside. and a hypertonic solution is one where the concentration of solutes is greater outside the cell than inside it.
22) The correct option is C. support.
Cholesterol helps give the plasma membrane extra support. It is more rigid than some of the other lipids in the plasma membrane.
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