Active Transport - Transport Part 2

Active Transport - Transport Part 2

Honors Biology -SCCA Dr.

Poll

Did this presentation and quiz help you improve your knowledge regarding ACTIVE TRANSPORT?

• Yes

• No

Multiple Choice

Active transport within a cell is any kind of movement of substances that requires ________.

• ATP for energy

• protein for energy

• fats for energy

• electricity fo renergy

Active Transport

Energy is required! All cells use ATP for energy, so Active Transport requires ATP.

Multiple Select

Which of the following are forms of active transport? Click all that apply:

• osmosis

• ion pump

• diffusion

• anything moving up concentration gradient from low--> high concentration

• pinocytosis

Proton Pump - What is it?

• Some processes such as photosynthesis and respiration REQUIRE proton pumps? Why?

• Think about a rock on a cliff...it has potential energy because with just a small push it will fall down and can do a lot of work (smashing other rocks) when it hits the ground

• 
  

Proton Pump - What is it?

• By pumping (using ATP) ions against their concentration gradient cells are storing up a lot of potential energy in one small space.

• When they need the energy to make ATP, the ions flow back down their concentration gradient (much like dropping a ball or rock from high place). This energy released during the flow from high->low is used to make ATP.

• 
  

Proton Pump - What is it?

• Pumping ions against their concentration gradient so they can be used later to make ATP requires ENERGY, so this is ACTIVE Transport!

• Why use ATP to store ions to then make more ATP? Because the yield of ATP is much higher than the investment used pumping the ions

• We will see this again n photosynthesis and respiration

Multiple Select

Why are ion pumps needed? Check all that apply.

• To move ions down their concentration gradient from high -> low concentration.

• To move ions up their concentration gradient from low -> high concentration.

• To create stored potential energy to eventually make ATP.

• To make proteins.

Study the types of active transport shown here --Why do you think these require energy?

Different types of Endocytosis

• Phagocytosis - cell eating - requires membrane repair

• Pinocytosis - cell drinking - requires membrane repair

• Endocytosis (w/ receptor) requires special proteins to pass molecules across membranes

Multiple Select

Why does endocytosis require ATP?

• It doesn't-this is a form of osmosis.

• New portions of the cell membrane must be created or repaired.

• No ATP is required - this is an example of facilitated diffusion.

Exocytosis

If a cell needs to get rid of large molecules, debris, or liquids it will form a membrane vesicle that will then fuse with the cell membrane, and the contents will be released outside the cell.

Multiple Choice

If there are large molecules or debris that a cell wants to expel or release into the blood stream , it will use _____ to do so.

• pinocytosis

• endocytosis

• exocytosis

• phagocytosis