Unit 2 Day 4: Cell Membrane + Active Transport Hw#3

Which type of biological macromolecule is the main component of the plasma membrane?

• carbohydrate

• lipid

• protein

• nucleic acid

What is NOT TRUE about the cell membrane?

• It controls what enters and leaves the cell
• Semipermeable
• Phospholipid bilayer
• Contains digestive enzymes

What forms the channels and pumps in the phospholipid bilayer?

• carbohydrates
• proteins
• hydrophilic heads 
• lipids

___________ have 2 functions in the cell membrane.
1.) They act like gatekeepers, only let certain things in. 
2.) Enzyme receptors embedded in the membrane.

• Carbohydrates 
• Proteins 
• Phospholipids 
• Cholesterol

Something is ___________ ____________
when some molecules can cross the membrane while others cannot. 

• Selectively (or Semi) Permeable 
• Totally Transparent
• Liquid Licorice 
• Heavily Patrolled 

A phospholipid has 2 parts. What are they called? 

• Hydrophilic Head, Hydrophobic Tail 
• Hydrophobic Head, Hydrophilic Tail 

Another term for equilibrium is...

• Equality
• Babycakes
• Homeostasis
• Balance

Match the following:

• Carbohydrates

• allows large and polar molecules to pass through the membrane

• Cholesterol

• regulates what goes in and out of the cell

• Plasma or Cell Membrane

• 2 layers; allows small & non-polar molecules to pass through the membrane

• Phospholipid bilayer

• located outside of the membrane; helps with cell communication and cell-to-cell connections

• Transport or Channel Proteins

• stabilizes and maintains flexibility of cell membrane

Identify the structure in the diagram.

• Phospholipid

• Cholesterol

• Triglyceride

• Carbohydrate

The cell membrane, also known as the ​ (a)   membrane, is found in ​ (b)   types of cells. It controls and ​ (c)   what is allowed in and out of the cell to help maintain ​ (d)   or a balanced environment. It also is known as the ​ (e)   because the different parts of the cell membrane can move around and are not fixed in one location.

• plasma
• all
• regulates
• homeostasis
• fluid mosaic model
• some