1. How would be best describe the cell membrane?

• A phospholipid trilayer

• A semipermeable protein layer

• A semipermeable phospholipid bilayer embedded with proteins

• A phospholipid bilayer embedded with phospholipids

Which of the following is the MAIN function of the cell membrane we have been worried about?

• Controls what goes into and out of the cell

• Protection

• Cell signaling

• Contains the cytoplasm and organelles

• Cell mobility, excretion, and absorption

What is homeostasis?

• Similar structures between different organisms

• Unbalanced internal environment of the cell, or body

• A type of transport into or out of the cell that results in an unbalanced state

• Balanced internal environment of the cell, or body

Tags

NGSS.HS-LS1-3

How does the membrane help maintain homeostasis in the cell?

• By moving the cell to new environments

• By controlling what goes into and out of the cell

• By protecting the cell from predators

• By containing the cytoplasm and cell organelles

Tags

NGSS.MS-LS1-2

The following diagram is showing an example of which of the following concepts we covered in this unit?

• Diffusion

• Osmosis

• Active Transport

• Endocytosis

What does semipermeable (aka selectively permeable) mean?

• All things can get in or out of the cell

• Nothing can get in or out of the cell

• Some things can get into the cell but they can't get out of the cell

• Only certain things can get in or out of the cell

What are the 2 parts of a phospholipid? 

• Hydrophobic head, hydrophilic tails 
• Hydrophobic heads, hydrophobic tails 
• Hydrophilic heads, hydrophobic tails 
• Hydrophilic heads, hydrophilic tails 

What property of the cell membrane makes it selectively permeable?

• The fact it has two layers

• The fact that it has proteins

• The fact that the majority is hydrophilic

• The fact that the majority is hydrophobic

Molecules using simple diffusion move from 

• high to low concentrations 
• low to high concentrations 
• no concentrations  
• both concentrations  

Osmosis is the movement of... 

• salt 
• sugar 
• water 
• none of these 

Tags

NGSS.MS-LS1-3