BISC207: Exam 1 - Chapter 6

When is this statement true? There is no net movement of purple dye A) Always B) Never C) Only before equilibrium is reached D) Only at equilibrium

D) Only at equilibrium

What name is given to the process by which water crosses a selectively permeable membrane? A) diffusion B) phagocytosis C) pinocytosis D) osmosis E) passive transport

D) osmosis

This figure is an example of a(n) _____. A) nucleic acid B) unsaturated fat C) steroid D) saturated fat E) protein

D) saturated fat

When is this statement true? Orange dye moves independently from purple dye A) Always B) Never C) Only before equilibrium is reached D) Only at equilibrium

A) Always

Which is this statement true for? Allow water molecules and small ions to flow quickly across the membrane A) Only channels B) Only carries C) Both channels and carries

A) Only channels

Which is this statement true for? Provide a continues path across the membrane A) Only channels B) Only carries C) Both channels and carries

A) Only channels

Which of the following molecules can cross the lipid bilayer of a membrane directly, without a transport protein or other mechanism? Select all that apply. A) water B) carbon dioxide C) proteins D) sucrose E) ions F) lipids G) oxygen

A, B, F, G

Which of the following statements is TRUE with regard to this animation? A) The cell does not expend ATP. B) Both sodium and potassium ions are transported against their concentration gradients. C) Sodium ions are transported down their concentration gradient. D) The cell is not expending energy. E) Potassium ions are transported down their concentration gradient.

B) Both sodium and potassium ions are transported against their concentration gradients.

What do fats, steroids, and waxes have in common? A) Moderate polarity. B) Low solubility in water. C) They occur in membranes. D) Both (a) and (c). E) Both (b) and (c).

B) Low solubility in water.

When is this statement true? Purple dye moves only from side B to side A A) Always B) Never C) Only before equilibrium is reached D) Only at equilibrium

B) Never

Which is this statement true for? Transport primarily small polar organic molecules A) Only channels B) Only carries C) Both channels and carries

B) Only carries

Which is this statement true for? Undergo a change in shape to transport solutes across the membrane A) Only channels B) Only carries C) Both channels and carries

B) Only carries

Dr. Haxton told one of his students, "To move in the bloodstream, fats need the help of phospholipids." What would a good student say? A) Not so. Fats are small enough to travel easily without help. B) Yes. Nonpolar molecules aren't compatible with water. C) You have it backwards. Fats help phospholipids to travel. D) Sorry, Dr. Haxton! Help comes from cholesterol, not phospholipids. E) Right. Fats are too polar to travel alone in water.

B) Yes. Nonpolar molecules aren't compatible with water.

You know that this cell is in a(n) _____ solution because the cell _____. A) hypotonic ... shrunk B) hypotonic ... swelled C) hypertonic ... lost water D) isotonic ... neither lost nor gained water E) hypertonic ... gained water

B) hypotonic ... swelled

Which is this statement true for? Are integral membrane portion A) Only channels B) Only carries C) Both channels and carries

C) Both channels and carries

Which is this statement true for? Provide a hydrophilic path across the membrane A) Only channels B) Only carries C) Both channels and carries

C) Both channels and carries

Which is this statement true for? Transport solutes down a concentration or electrochemical gradient A) Only channels B) Only carries C) Both channels and carries

C) Both channels and carries

When is this statement true? Concentration gradients exist that drive diffusion of both dyes A) Always B) Never C) Only before equilibrium is reached D) Only at equilibrium

C) Only before equilibrium is reached

When is this statement true? There is a net movement of orange dye from side A to side B A) Always B) Never C) Only before equilibrium is reached D) Only at equilibrium

C) Only before equilibrium is reached

A function of cholesterol that does not harm health is its role _____. A) All of cholesterol's effects cause the body harm. B) as the primary female sex hormone C) as a component of animal cell membranes D) the most abundant male sex hormone E) in calcium and phosphate metabolism

C) as a component of animal cell membranes

This cell is in a(n) _____ solution. A) hypotonic B) hypertonic or isotonic C) hypertonic D) isotonic E) hypotonic and isotonic

C) hypertonic

Which of these is rich in unsaturated fats? A) beef fat B) lard C) olive oil D) a fat that is solid at room temperature E) butter

C) olive oil

Structure A in the figure is a(n) _____. A) structural protein B) receptor molecule C) transport protein D) enzyme E) antibody

C) transport protein

Which of these is NOT a lipid? A) wax B) cholesterol C) steroids D) phospholipid E) RNA

E) RNA

You know that this cell is in a(n) _____ solution because it _____. A) hypotonic ... lysed B) hypertonic ... gained water C) hypotonic ... is turgid D) hypertonic ... lysed E) hypertonic solution ... lost water

E) hypertonic solution ... lost water