Substance Movement Across Membranes

1. Which of the following processes involves the movement of water molecules across a semi-permeable membrane? A) Osmosis B) Diffusion C) Active transport D) Facilitated diffusion

• Evaporation

• Filtration

• Condensation

• A) Osmosis

2. Which substance can easily diffuse through the phospholipid bilayer of a plasma membrane? A) Glucose B) Sodium ions C) Oxygen D) Starch

• Cholesterol

• Fructose

• C) Oxygen

• Calcium ions

3. The process by which large particles are engulfed by the plasma membrane into a cell is known as: A) Pinocytosis B) Phagocytosis C) Exocytosis D) Active transport

• Facilitated diffusion

• Simple diffusion

• B) Phagocytosis

• Osmosis

4. Which of the following requires energy in the form of ATP? A) Osmosis B) Simple diffusion C) Facilitated diffusion D) Active transport

• E) Passive transport

• D) Active transport

• G) Exocytosis

• F) Endocytosis

5. What will happen to a red blood cell placed in a hypertonic solution? A) It will burst B) It will shrink C) It will remain the same D) It will swell

• B) It will shrink

• It will expand

• It will dissolve

• It will change color

6. Which of the following is NOT true about diffusion? A) It requires a concentration gradient B) It can occur in gases, liquids, and solids C) It is a passive process D) It requires energy input

• D

• It requires a membrane to function

• It is a form of active transport

• It only occurs in liquids

7. What is the primary function of the plasma membrane? A) Energy production B) Selective permeability C) Protein synthesis D) DNA replication

• G) Signal transduction

• E) Cell division

• B) Selective permeability

• F) Nutrient storage

8. In which type of solution do cells swell due to water intake? A) Isotonic B) Hypertonic C) Hypotonic D) None of the above

• A) Isotonic

• C) Hypotonic

• B) Hypertonic

• D) None of the above

9. Which of the following best describes facilitated diffusion? A) Movement against a concentration gradient B) Movement through a protein channel C) Requires ATP D) Occurs only in plant cells

• Movement with the concentration gradient

• Occurs only in animal cells

• Requires energy from sunlight

• B) Movement through a protein channel

10. What is the role of carrier proteins in the plasma membrane? A) To provide structural support B) To facilitate the movement of substances C) To synthesize proteins D) To store energy

• A) To provide structural support

• C) To synthesize proteins

• B) To facilitate the movement of substances

• D) To store energy