Passive Transport

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.

Which way will the water molecules move during osmosis? (Mickey Mouse molecules in diagram)

• Out of the cell, so the cell shrinks.

• Out of the cell, so the cell swells.

• Into the cell, so the cell shrinks.

• Into the cell, so the cell swells.

Tags

NGSS.HS-LS1-3

Which phrase does not belong with the others?

• No energy is required.

• Molecules move from high to low concentration.

• Passive transport

• Energy is needed.

Which are form(s) of passive transport?

• Osmosis

• Facilitated diffusion

• Active transport

• Diffusion

Passive transport moves molecules from...

• low concentration to high concentration

• high concentration to low concentration

Which type of passive transport uses the help of a transport protein?

• Osmosis

• Facilitated diffusion

• Simple diffusion

What is it called when molecules move across the cell membrane from an area of high concentration to an area of low concentration through a carrier protein?

• Diffusion
• Osmosis
• Active Transport
• Facilitated Diffusion

The concentration of water is higher in the soil than in plant root cells. Water moves into root cells of a plant by...

• Facilitated Diffusion
• Simple Diffusion
• Active Transport
• Osmosis

Molecules diffusing with the concentration gradient through a protein channel is...

• Facilitated Diffusion
• Simple Diffusion
• Active Transport
• Osmosis

This cell organelle helps organisms maintain homeostasis by controlling what substances may enter or leave cells.

• vacuole
• nucleus
• cell membrane
• cell wall

Tags

NGSS.HS-LS1-3