biology: cell membrane & magnification

which letter shows the lipid bilayer?

• c

• f

• h

• g

How many nanometers (nm)
= 1 mm?

• 1,000
• 10,000
• 100,000
• 1,000,000

To calculate magnification we use......

• image size x actual size
• image size ÷ actual size
• actual size ÷ image size

at low temperature cholesterol increases the (a)   of the membrane

If the image measures 100 mm and the scale bar is is 50 µm, what is the magnification?

• 2,000 x
• 150 x
• 5,000 x
• 20 x

A ______________ is composed of a phosphate and glycerol head and 2 fatty acid chain tails. 

• phospholipid 
• Carbohydrate
• Cholesterol 
• Protein 

It forms a boundary between the inside of the cell and the outside of the cell. 

• Cell Membrane
• Lipid Cleric Layer
• Membrane Gate
• Protein Receptors 

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

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

What forms the channels and pumps in the phospholipid bilayer?

• carbohydrates
• proteins
• hydrophilic heads 
• lipids

Which of the following is NOT part of the cell membrane?

• Lipids
• Carbohydrates
• Proteins
• Nucleic Acids