LESSON 5

Question 1

composed of lipids and proteins

Answer 1

cell membrane

Question 2

The lipids are arranged in a _____?

Answer 2

bilayer

Question 3

The bilayer is a “______” that is impermeable to
most molecules

Answer 3

barrier

Question 4

The _____ are embedded in the bilayer.

Answer 4

proteins

Question 5

cover the surface of every cell, and also surround most organelles within cells.

Answer 5

membranes

Question 6

Composed of two fatty acid chains attached to a glycerol molecule and phosphate group.

Answer 6

phospholipids

Question 7

a difference in concentration of a substance in one area compared to another.

Answer 7

concentration gradient

Question 8

movement of substances without any energy input by
a cell

Answer 8

passive transport

Question 9

molecules move straight through the membrane

Answer 9

diffusion

Question 10

molecules or ions move through protein channels embedded in the membrane

Answer 10

Facilitated diffusion

Question 11

water molecules move through the membrane (mostly through protein channels)

Answer 11

osmosis

Question 12

The solution has a lower concentration of
solutes and a higher concentration of water than
inside the cell. (Low solute; High water)

Answer 12

hypotonic

Question 13

The solution has a higher concentration
of solutes and a lower concentration of water than
inside the cell. (High solute; Low water)

Answer 13

hypertonic

Question 14

The concentration of solutes in the solution is equal to the concentration of solutes inside the cell

Answer 14

isotonic