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Chapter 5Â Â Life’s Border: The Plasma Membrane 1) The outer living limit of the cell is called the: A) cell wall. B) edge. C) plastid. D) plasma membrane. 2) Cystic fibrosis is the result of: A) no sodium channel protein. B) no sodium-potassium pump. C) an abnormal sodium channel protein. D) an abnormal chloride channel protein. E) cysts in the lungs. 3) The primary component of the plasma membrane is: A) cholesterol. B) phospholipid. C) protein. D) carbohydrate. 4) A purpose of the plasma membrane is to: A) form the outer boundary of a cell. B) produce proteins. C) allow no contact with other cells. D) keep harmful substances within the cell. E) form ribosomes. 5) Which of the following is an accurate description of the plasma membrane? A) It is a phospholipid bilayer embedded with proteins. B) It separates the nuclear contents from the environment. C) It is permeable to all substances. D) It is a solid material. 6) Short chains of sugars attached to proteins or phospholipids in the cell membrane make up the: A) phospholipid bilayer. B) communication proteins. C) cholesterol. D) glycocalyx. 7) The ________ of a phospholipid molecule will seek water, whereas the ________ of the molecules will avoid water. A) tail; head B) head; tail C) hydrophobic portion; hydrophilic portion D) fatty acid; phosphate group 8) The huge array of capabilities of the plasma membrane are performed by its: A) carbohydrates. B) proteins. C) phospholipids. D) cholesterol. 9) Which of the following is true of the plasma membrane? A) It controls the passage of substances into and out of the cell. B) It only allows hydrophilic materials to pass through. C) It is a rigid, nonchanging structure. D) Its capabilities are primarily determined by carbohydrates in the membrane. 10) How does glucose enter a cell if levels of blood glucose are high? A) An electrical signal is passed through the blood, opening glucose channels within the membranes of cells. B) Insulin molecules bind to glucose receptors, causing cellular responses to take up glucose. C) The glucose molecules diffuse through the membrane. D) Glucose pokes a hole in the cell’s membrane, creating a channel through which it can move. 1