BNFH01 - Membrane Transport

What is the main property of the plasma membrane?

• Complete impermeability
• Fluidity and rigidity
• Selective permeability
• High electrical conductivity

Which molecules can freely cross the plasma membrane?

• Small nonpolar molecules and water
• Large polar molecules
• Ions and charged particles
• Proteins and nucleic acids

What is passive transport?

• Passive transport requires energy to move substances.
• Passive transport is the movement of substances against a concentration gradient.

• Passive transport is the movement of substances across a cell membrane without the use of energy.
• Passive transport is a type of osmosis.

What drives diffusion?

• The alignment of particles.
• The temperature of the environment.
• The pressure applied to the particles.
• Concentration of gradients.

In osmosis, water moves from:

• a solid substance to a liquid substance
• an area of lower solute concentration to an area of higher solute concentration
• an area of equal solute concentration to another area of equal solute concentration
• an area of higher solute concentration to an area of lower solute concentration

What stops at equilibrium in diffusion?

• The temperature of the system increases.
• Particles move faster than before.
• The net movement of particles stops.
• The concentration gradient becomes steeper.

How does the sodium-potassium pump function?

• The sodium-potassium pump passively transports ions without using ATP.
• The sodium-potassium pump functions by actively transporting 3 sodium ions out of the cell and 2 potassium ions into the cell using ATP.
• The sodium-potassium pump transports 2 sodium ions out of the cell and 3 potassium ions into the cell.
• The sodium-potassium pump only allows potassium ions to enter the cell without any sodium transport.

Tags

NGSS.HS-LS1-3

What is the role of co-transport in active transport?

• Co-transport facilitates the movement of substances against their concentration gradient by using the energy from the movement of another molecule down its gradient.
• Co-transport requires ATP to function independently.
• Co-transport is a passive process that does not require energy.
• Co-transport only moves substances with their concentration gradient.

Which type of active transport moves substances into the cell by engulfing them in a vesicle?

• Exocytosis
• Facilitated diffusion
• Osmosis
• Endocytosis

Which endocytosis type involves the cell taking in large particles like bacteria?

• Receptor-mediated endocytosis
• Pinocytosis
• Phagocytosis
• Exocytosis