Cell Membrane Structure

What macromolecule makes up the majority of cell membranes?

• Proteins

• Lipids

• Nucleic Acids

• Carbohydrates

What type of lipid is shown?

• Fatty Acid

• Phospholipid

• Triglyceride

• Cholesterol

What does the term hydrophobic mean?

• Dislikes water

• Loves water

• Uses water to create energy

• Positive and negative charge on either end

What does the term hydrophilic mean?

• Likes water

• Dislikes water

• The creation of water molecules

• Protein synthesis

What is the function of proteins in the cell membrane? Check all that apply:

• Transport ions and other large molecules though the bilayer

• Signal receptors to indicate what is on the outside of the cell

• Makes up the majority of the membrane

• Block unwanted materials from entering the cell

True or False: The phospholipid bilayer forms with the hydrophobic heads facing outwards and the hydrophilic tails facing inwards

• True

• False

True or False: Because the inner region of the cell membrane is non-polar, any non-polar molecules can pass through the membrane.

• True

• False

True or False: All molecules that have a charge or are too large cannot pass through the cell membrane easily

• True

• False

What does it mean to be selectively permeable?

• Allows some, but not all molecules to cross

• Allows all molecules to cross but still regulates how much goes through

• It chooses what day it has a certain hairstyle

• Rarely allows molecules to cross without the help of channel proteins

The image represents the fluid mosaic model. Which of the following best describes the fluid mosaic model?

• Cell membrane components are able to float and move throughout the membrane surface

• Cell membrane components are stuck in place. It is critical to get the placement right

• The membrane is not flexible at all and cannot expand

• The membrane allows fluids to pass through easily