Cell Transport

The movement of materials across the cell membrane without using cellular energy is called:

• active transport
• endocytosis
• exocytosis
• passive transport

One of the most important functions of the cell membrane is to keep the cell’s internal conditions relatively constant.

• True

• False

Tags

NGSS.HS-LS1-3

The process by which particles move from an area of high concentration to an area of lower concentration is known as:

• endocytosis
• diffusion
• active transport
• osmosis

When the concentration of a substance on both sides of the cell membrane is the same, _________ is reached.

• equilibrium
• osmosis
• perfection
• active transport

Even when equilibrium is reached, particles of a solution will continue to  move across the membrane in both directions.

• True
• False

_______ depends upon random particle movements. Substances diffuse across membranes without requiring the cell to use additional energy.

• Endocytosis
• Protein synthesis
• Active transport
• Diffusion

Cell membranes have _____ that act as carriers, or channels, making it easy for certain molecules to cross.

• nuclei
• smooth ERs
• carbohydrates
• proteins 

Molecules that cannot directly diffuse across the membrane pass through special protein channels in a process known as ______________. 

• facilitated diffusion
• active transport
• endocytosis
• homeostasis

 An example of facilitated diffusion is: 

• endocytosis
• simple diffusion
• osmosis 
• exocytosis

______ is the diffusion of water through a selectively permeable membrane from an area of higher concentration to an area of lower concentration.

• Osmosis
• Facilitated diffusion
• Endocytosis
• Active transport