Membrane Passive transport

Question 1

What is Passive Transport?

Answer 1

Passive Transport is the movement of the cell across a membrane without using energy

Question 2

Give me two examples of passive Transport.

Answer 2

Diffusion and Osmosis

Question 3

During passive transport , do particles move UP or DOWN the concentration gradient?

Answer 3

Down

Question 4

Why does water move through a cell’s membrane?

Answer 4

Water moves to make sure there’s an equal amount of stuff (like salt or sugar) on both sides of the membrane.

Question 5

What is Osmosis?

Answer 5

Osmosis is the diffusion of water across a selectively permeable membrane

Question 6

Why is Osmosis important?

Answer 6

Osmosis regulates the water flow through the plasma membrane , which helps maintain homeostasis within a c
ell

Question 7

what factor affecting transport?

Answer 7

Cell Membrane

Question 8

The Membrane is Permeable to:

Answer 8

H2O,
Gases( O2 , CO2 ,N2)
Lipids
Small polar neutral (Urea)

Question 9

What types of molecules is impermeable or less permeable in the cell membrane?

Answer 9

The membrane is less impermeable to small polar molecules, large unchained molecules such as amino acids, glucose, and large molecules( Fatty acids)

Question 10

what are the two types transport across the membrane?

Answer 10

Active and Passive Transport

Question 11

where do the active and passive transport move in regards to the concentration gradient?

Answer 11

Active transport is against the concentration gradient
Passive transport is down the concentration gradient

Question 12

What does Fick’s Law of Diffusion describe?

Answer 12

Fick’s Law of Diffusion describes how substances move from areas of high concentration to areas of low concentration, with the rate depending on the concentration gradient, surface area, and distance.

Question 13

How does the concentration gradient affect the rate of diffusion according to Fick’s Law?

Answer 13

The rate of diffusion is directly proportional to the concentration gradient; as the difference in concentration increases, the rate of diffusion also increases.

Question 14

What does biomembrane permeability refer to?

Answer 14

Biomembrane permeability refers to the ability of membranes to allow certain substances to pass through while blocking others.

Question 15

What is facilitated diffusion, and how does it differ from active transport?

Answer 15

Facilitated diffusion is a passive process that moves substances down their concentration gradient, using transport proteins to help larger or polar molecules cross the membrane without using energy.

Question 16

What are the two models of facilitated diffusion, and how do they differ?

Answer 16

The two models of facilitated diffusion are the pore channel, which is a hole through the membrane allowing certain molecules to pass, and the carrier channel, where a small molecule carries substances across the membrane, typically for larger or less permeable species

Question 17

Give 4 Examples for the pores model:

Answer 17

• Potassium Channel
• Aquaporin water channel
• Voltage gated sodium channel
• The Ionophore gramicidin

Question 18

Give 2 Examples of carrier uniporters:

Answer 18

• The ionophore valinomycin
• The protein carrier of glucose – GLUT1

Question 19

What are ionophores and what role do they play in ion movement?

Answer 19

Ionophores are molecules (either small antibiotics or synthetic) that help move ions across cell membranes. They act as either carriers or channels, making it easier for ions to pass through. Essentially, they are known as “ion carriers” because they facilitate the transport of ions, helping to maintain balance in cells.