1.3.3 Active Transport

• Active transport uses energy, usually in the form of ATP
• What is the structure of a cell membrane?

  Phospholipid bilayer
• Steps in the process of active transport:

  1️⃣ Energy from ATP is released

  2️⃣ Substance binds to membrane protein

  3️⃣ Protein changes shape

  4️⃣ Substance is moved across membrane
• What is the primary component of cell membranes?

  Phospholipid bilayer
• Endocytosis and exocytosis are types of active transport
• Match the transport type with its key characteristic:

  Active Transport ↔️ Requires ATP

  Passive Transport ↔️ Moves down concentration gradient
• Active transport moves substances against their concentration gradient using energy.


  True
• Match the type of transport with an example:

  Active Transport ↔️ Sodium-Potassium Pump

  Passive Transport ↔️ Diffusion

  Osmosis ↔️ Water Movement

  Facilitated Diffusion ↔️ Glucose Uptake
• Exocytosis transports proteins, hormones, and neurotransmitters
• In which direction does passive transport move substances?

  Down the gradient
• What is an example of active transport in nerve cells?

  Sodium-potassium pump
• Match the type of transport with an example:

  Active Transport ↔️ Calcium Pumps

  Passive Transport ↔️ Osmosis
• Active transport is essential for maintaining cell homeostasis.

  True
• Passive transport requires energy to move substances across the cell membrane.

  False
• The phospholipid bilayer provides a flexible barrier
• Active transport moves substances from areas of high concentration to low concentration.

  False
• Membrane proteins perform enzymatic activity and signal transduction
• Exocytosis involves the release of substances from the cell into the extracellular space.


  True
• What molecule stabilizes the phospholipid bilayer in cell membranes?

  Cholesterol
• What energy source drives active transport processes?

  ATP
• Endocytosis and exocytosis are both active transport processes.


  True
• Match the type of endocytosis with its description:

  Phagocytosis ↔️ Engulfing large particles

  Pinocytosis ↔️ Engulfing liquids
• Active transport requires energy, while passive transport requires no
• The sodium-potassium pump maintains the electrochemical gradient across the cell membrane by pumping sodium ions out and potassium ions in
• Steps in the absorption of glucose in the small intestine

  1️⃣ Glucose is transported across the cell membrane

  2️⃣ ATP is hydrolyzed to release energy

  3️⃣ Membrane proteins act as carriers

  4️⃣ Glucose moves against its concentration gradient
• What is active transport?

  Movement against concentration gradient
• Match the transport type with its key feature:

  Active Transport ↔️ Requires ATP

  Passive Transport ↔️ Moves down concentration gradient
• What roles do membrane proteins play in cell membranes?

  Facilitate transport and signal transduction
• Match the transport type with its energy requirement:

  Active Transport ↔️ Requires ATP

  Passive Transport ↔️ No ATP required
• What is the energy source for active transport?

  ATP
• What is the process of endocytosis?

  Cell membrane engulfs particles
• Cell membranes consist of a phospholipid bilayer, where phospholipids align with hydrophobic tails facing inward
• Active transport requires ATP, while passive transport requires no
• What is the direction of substance movement in endocytosis?

  Inward
• Passive transport moves substances against their concentration gradient.

  False
• What is the primary role of membrane proteins in active transport?

  Substance movement
• Passive transport requires ATP to function.

  False
• Which organelle uses proton pumps to secrete hydrochloric acid?

  Stomach lining
• What is one example of active transport in the kidneys?

  Waste elimination