Biol 1408 Chapter 5 Pre-lecture Assignment
1. The main components of the cell membrane are lipids, proteins and glycerol. (They also have
glycolipids/glycoproteins. We will learn that in class )
2. The structure of the cell membrane is described as a fluid mosaic model. Here the fluid portion
is the plasma and the mosaic refers to the combination.
3. The ability of the membrane to allow some substances to pass through but not others is
termed electrochemical gradient.
4. Diffusion is the movement of solid material from an area of high concentration of the material
to an area of lower concentration.
5. Polar /Nonpolar (circle one) molecules like oxygen and carbon dioxide are able to diffuse
directly through the phospholipid bilayer. This type of diffusion is called facilitated diffusion.
6. Polar/Nonpolar (circle one) molecules like ions diffuse through protein channels. This type of
diffusion is called facilitated_.
7. The transport of water across the membrane is called osmosis. This process moves solvents
(like water) from an area of higher_ concentration of solutes (dissolved material) to lower_
concentration of solutes. Water is transported across the membrane through special channel
proteins called aquaporins.
8. When comparing the concentration of solutes of two areas, like inside and outside the cell,
hypertonic refers to the area with the higher/lower/same (circle one) concentration of
solutes. Hypotonic refers to the area with the higher/lower/same (circle one) concentration of
solutes. Isotonic refers to the area with the higher/lower/same (circle one) concentration of
solutes.
9. In a hypertonic solution, water moves into/out (circle one) of cells. In a hypotonic solution,
water moves into/out (circle one) of cells.
10. Active transport is the movement of substances from an area of high/low (circle one)
concentration to an area of high/low (circle one) concentration. This process does/does not
(circle one) need energy.
11. The process by which large molecules come into the cell is called endocytosis; while large
molecules get out of the cell through the process termed exotytosis.
12. The 3 types of endocytosis are phagocytosis_, pinocytosis and receptor-mediated endocytosis.
1. The main components of the cell membrane are lipids, proteins and glycerol. (They also have
glycolipids/glycoproteins. We will learn that in class )
2. The structure of the cell membrane is described as a fluid mosaic model. Here the fluid portion
is the plasma and the mosaic refers to the combination.
3. The ability of the membrane to allow some substances to pass through but not others is
termed electrochemical gradient.
4. Diffusion is the movement of solid material from an area of high concentration of the material
to an area of lower concentration.
5. Polar /Nonpolar (circle one) molecules like oxygen and carbon dioxide are able to diffuse
directly through the phospholipid bilayer. This type of diffusion is called facilitated diffusion.
6. Polar/Nonpolar (circle one) molecules like ions diffuse through protein channels. This type of
diffusion is called facilitated_.
7. The transport of water across the membrane is called osmosis. This process moves solvents
(like water) from an area of higher_ concentration of solutes (dissolved material) to lower_
concentration of solutes. Water is transported across the membrane through special channel
proteins called aquaporins.
8. When comparing the concentration of solutes of two areas, like inside and outside the cell,
hypertonic refers to the area with the higher/lower/same (circle one) concentration of
solutes. Hypotonic refers to the area with the higher/lower/same (circle one) concentration of
solutes. Isotonic refers to the area with the higher/lower/same (circle one) concentration of
solutes.
9. In a hypertonic solution, water moves into/out (circle one) of cells. In a hypotonic solution,
water moves into/out (circle one) of cells.
10. Active transport is the movement of substances from an area of high/low (circle one)
concentration to an area of high/low (circle one) concentration. This process does/does not
(circle one) need energy.
11. The process by which large molecules come into the cell is called endocytosis; while large
molecules get out of the cell through the process termed exotytosis.
12. The 3 types of endocytosis are phagocytosis_, pinocytosis and receptor-mediated endocytosis.
