Cell Transport

What are the two main types of membrane transport?

• Passive transport and active transport

• Simple diffusion and filtration

• Endocytosis and exocytosis

• Facilitated diffusion and osmosis

Which of these is NOT an example of passive transport?

• facilitated diffusion

• osmosis

• simple diffusion

• exocytosis

What is true of active transport and how it differs from passive transport?

• Active transport requires energy to move substances against their gradient, while passive transport does not require energy and moves substances along their gradient.

• Active transport occurs only in plant cells, while passive transport occurs in animal cells.

• Active transport requires energy to move substances along their gradient.

• Active transport moves substances along their gradient without energy.

What is facilitated diffusion and how does it work?

• Facilitated diffusion involves the active transport of substances across membranes.

• Facilitated diffusion is a process that allows substances to cross membranes with the help of proteins, moving down their concentration gradient without energy.

• Facilitated diffusion is a process that only occurs in plant cells.

• Facilitated diffusion requires energy to move substances against their concentration gradient.

Explain the role of proteins channels in facilitated diffusion.

• Protein channels create energy for cellular respiration.

• Protein channels actively pump molecules against their concentration gradient.

• Protein channels assist in the passive movement of molecules across membranes during facilitated diffusion.

• Protein channels are only involved in active transport processes.

What happens to a cell placed in a hypertonic solution?

• The cell divides into two smaller cells.

• The cell shrinks due to water loss.

• The cell remains unchanged in size.

• The cell swells due to excess water intake.

How does osmosis differ from diffusion?

• Osmosis specifically refers to the movement of water across a membrane, while diffusion refers to the movement of any molecules.

• Osmosis and diffusion are the same process, just with different names.

• Diffusion only occurs in living cells, whereas osmosis can happen in any environment.

• Osmosis is the movement of molecules in a gas, while diffusion is the movement of water.

What is the effect of an isotonic solution on a cell?

• The cell shrinks in size and shape.

• The cell bursts and spills its contents.

• The cell remains unchanged in size and shape.

• The cell absorbs excess water and expands.

Describe what occurs to a cell in a hypotonic solution.

• The cell absorbs nutrients and grows larger.

• The cell shrinks and becomes dehydrated.

• The cell swells and may burst due to water influx.

• The cell remains unchanged in size.

What is the significance of the concentration gradient in membrane transport?

• The concentration gradient is irrelevant to cellular processes.

• The concentration gradient is significant as it drives the movement of substances across membranes, enabling essential cellular processes.

• The concentration gradient prevents substances from moving across membranes.

• The concentration gradient only affects water movement in cells.