Unit 6 Cell Membrane & Transport Quiz

Which type of molecule forms most of the cell membrane?

• glucose
• phospholipids
• nucleic acids

Which part of the cell membrane diagram is represented by the white circles?

• phosphate heads
• fatty acid tails
• protein channels

The cell membrane is known to be ________________ since it only lets certain materials into or out of the cell.

• impermeable
• semipermeable
• concentrated

What part of a phospholipid is hydrophobic?

• phosphate head
• fatty acid tail

Which part of the phospholipid is polar?

• phosphate head
• fatty acid tail

Which type of molecules can easily pass through the lipid part of the cell membrane?

• small, nonpolar molecules
• macromolecules
• water
• ions

Diffusion always causes particles to move from a region of ______ concentration to a region of _____ concentration.

• high, low
• low, high

Which type of transport moves molecules against the concentration gradient and requires ATP energy?

• passive transport
• active transport
• diffusion

Which is not an example of passive transport?

• diffusion
• osmosis
• endocytosis

During facilitated diffusion, molecules are aided across the cell membrane with the help of:

• proteins
• carbohydrates
• ribosomes