Cell Membranes & Transport

Cell membranes are important mainly because ___.

• all materials needed by the cell must pass across them.
• all cell functions occur in the membrane.
• they only allow water to enter the cell.
• all energy is produced by them

Tags

NGSS.MS-LS1-2

Diffusion is the movement of molecules from

• low concentration to high concentration.
• equilibrium to high concentration.
• high concentration to low concentration.
• equilibrium to low concentration

Movement of water across a selectively permeable membrane is known as ___.

• osmosis
• active transport
• exocytosis
• facilitated transport

Iodine changed starch/glucose in a dialysis bag from white to blue (photo). What happened?

• The starch changed to glucose.
• The iodine diffused into the bag.
• The starch diffused out of the bag.
• The glucose diffused out of the bag.

T/F: If starch and glucose are in a dialysis bag, only the glucose can cross the membrane.

• True
• False

The starch/glucose solution in a dialysis bag will swell up over time. The swelling is due to 

• endocytosis.
• exocytosis.
• plasmolysis.
• osmosis.

Drinking seawater is dangerous to humans because

• the water is a hypertonic solution.
• the water is a hypotonic solution.
• the water is an isotonic solution.
• the water is poisonous.

T/F: "Plasma membrane" is the same thing as "cell membrane."

• True
• False

Which of the following processes requires the cell to spend energy in the form of ATP?

• active transport
• passive transport
• diffusion
• osmosis

Tags

NGSS.MS-LS1-7

Blood cells would swell and burst in a/an ___ solution.

• hypertonic
• hypotonic
• isotonic
• all three of these