Question

2a. Which of these substances is not found in the cell membrane?

1. fatty acids
2. chitin
3. cholesterol
4. phospholipids

2b. In the past meat was preserved by coating it with salt. One reason that this worked was that the salt, with a little bit of water, is __________relative to bacteria, and water would move _________ the bacteria killing them (hint: think beef jerky!!!!).

1. hypertonic; into
2. hypotonic; into
3. hypertonic; out of
4. hypotonic; out of

2c. Solution A 10% salt, is compared to Solution B, 5% salt. Solution A is

1. hypo-osmotic
2. isotonic
3. hypotonic
4. hypertonic

2e. Food coloring added to a container of water will eventually become evenly distributed even without stirring due to

1. diffusion
2. active transport
3. exocytosis
4. facilitated diffusion

5. 2f.A hypertonic solution as compared to a hypotonic solution under the same conditions has
   1. more, dissolved solutes
   2. the same number of water molecules
   3. a higher hydrostatic pressure
   4. a higher water potential

6. 2g.Movement of individual dye molecules as they are distributed throughout a tank of water
   1. is a random process
   2. results in the accumulation of dye molecules at one end of the tank
   3. is always against the concentration gradient
   4. results from differences in gravity, pressure, or both

Answer 1

2a. Which of these substances is not found in the cell membrane?

1. fatty acids
2. chitin
3. cholesterol
4. phospholipids

chitin is specifically part of cell wall of fungi while fatty acids, cholesterol and phospholipids are part of cell membrane

so ans is B

2b. In the past meat was preserved by coating it with salt. One reason that this worked was that the salt, with a little bit of water, is __________relative to bacteria, and water would move _________ the bacteria killing them (hint: think beef jerky!!!!).

1. hypertonic; into
2. hypotonic; into
3. hypertonic; out of
4. hypotonic; out of

higher salt conc than cytoplasm is called hypertonic and hypertonic solution extracts water from organisms based on principle of osmosis so C is the right option.

2c. Solution A 10% salt, is compared to Solution B, 5% salt. Solution A is

1. hypo-osmotic
2. isotonic
3. hypotonic
4. hypertonic

higher conc solution is hypertonic to low concentration solution. So d is the right choice

2e. Food coloring added to a container of water will eventually become evenly distributed even without stirring due to

1. diffusion
2. active transport
3. exocytosis
4. facilitated diffusion

spontaneous movement from high to low conc gradient is called diffusion. So A is answer

active transport take some protein carrier and energy

exocytosis is release of cellular material or waste through vesicle

facilitated diffusion involves some protein carrier although without energy

1. 2f.A hypertonic solution as compared to a hypotonic solution under the same conditions has
   1. more, dissolved solutes
   2. the same number of water molecules
   3. a higher hydrostatic pressure
   4. a higher water potential

more conc of solute than other solution called hypertonic so a is right choice here

1. 2g.Movement of individual dye molecules as they are distributed throughout a tank of water
   1. is a random process
   2. results in the accumulation of dye molecules at one end of the tank
   3. is always against the concentration gradient
   4. results from differences in gravity, pressure, or both

its is diffusion and is a random process. There is movement of dye from high conc to low conc until equilibrium is achieved. A is the right answer