Active/Passive Transport

_______ regulates what enters and leaves a cell.  

• Cell Membrane
• Nucleus
• Mitochondria
• Cytoplasm

Tags

NGSS.MS-LS1-2

What is diffusion?

• The movement of particles from low conc. to high conc. in a given space
• The movement of particles from high conc. to low conc. in a given space

Which type of passive transport uses proteins to help molecules pass through the membrane?

• Diffusion
• Facilitated diffusion
• Osmosis
• All of the above

Cell membranes are described as selectively permeable.

Four students were asked to explain what this means. Which one is correct?

• Student 1: Cell membranes prevent all materials from entering the cell.

• Student 2: Cell membranes only provide structural support for the cell.

• Student 3: Cell membranes regulate which substances can enter and exit the cell.

• Student 4: Cell membranes allow water and water-soluble substances to enter the cell.

Tags

NGSS.HS-LS2-3

Which part of the cell controls the movement of substances?

• mitochondria

• cell membrane

• chloroplast

• nucleus

All of the following are functions of a cell membrane EXCEPT

• surrounding and protecting the contents of the cell.

• releasing waste products from the cell.

• producing energy for the cell processes.

• allowing gases to enter the cell.

Which characteristic of a cell membrane allows it to control materials entering and leaving a cell?

• A cell membrane is surrounded by fluid.

• A cell membrane is semi-permeable.

• A cell membrane holds organelles in place.

• A cell membrane is found in plant and animal cells.

Tags

NGSS.MS-LS1-2

Passive Transport

• Does require cell energy

• Does NOT require cell energy

What is diffusion?

• when molecules move from a low concentration to a high concentration 
• when molecules move from a high concentration to a low concentration.
• no movement 
• molecules move everywhere

When both inside and outside of a cell have the same amount of water it is said that the cell has reached a state of

• Osmosis
• Diffusion
• Equilibrium