Lab 8, Diffusion and Osmosis

Question 1

Prokaryotes, eukaryotes chromsome count

Answer 1

Single vs multi

Question 2

Cell membrane structure

Answer 2

phospholipid bilayer

Question 3

phospholipid contains

Answer 3

one glycerol + 2 fatty acids

Question 4

phospholipid shape

Answer 4

hydrophillic head, hydrophobic tail

Question 5

Permable vs Selective

Answer 5

All in vs some molecules needs help crossing

Question 6

how doe cell membranes decide what to let through ( selective)

Answer 6

size and charge

Question 7

2 types of transport

Answer 7

Passive and Active

Question 8

Passive transport is

Answer 8

diffusion

Question 9

Active transport requires

Answer 9

ATP

Question 10

Active transport pumps accross membrane so….

Answer 10

it can build up in higher conc

Question 11

conc. gradient refers to

Answer 11

higher side

Question 12

Diffusion goes from _ to _ for ___

Answer 12

High to low for equalibrium

Question 13

moving down conc gradient means

Answer 13

High to Low equalism

Question 14

Diffusion is caused by _____ motion

Answer 14

Brownian Motion

Question 15

Brownian motion is equal to _____

Answer 15

Random molecular movement

Question 16

factors increase brownian motion

Answer 16

1 heating, 2 stirring

Question 17

2 kinds of passive transport ( diff)

Answer 17

simple and facilitated diffusion

Question 18

Rate of diffusion factors (3)

Answer 18

1 Temp
2) steeoness of conc. gradient
3) surface area of membrance

Question 19

Osmosis

Answer 19

passive diffusion of water molecules

Question 20

3M vs 1M solution

Answer 20

3M has high solute, low water
1M has low solute, high water

Question 21

water flows from __ to ___ ,

Answer 21

hypotonic to hypertonic, high water to low water

Question 22

Why are biological membranes and dialysis tubing considered to be differentially permeable

Answer 22

They only allow certain molecules to pass through based on their size, charge and polarity

Question 23

What color is phenolphthalein in a basic solution?____

Answer 23

PINK

Question 24

What color is produced when iodine is combined with starch

Answer 24

blue-black

Question 25

What is the difference between osmosis and diffusion

Answer 25

Diffusion is movement of particles from an area of higher conc to lower conc to equal it, while osmosis is the movement of SOLVENT particles across a semipermeable membrane.

Question 26

What is water potential

Answer 26

Measure of how freely water molecules can move within a system. Consists of solute potential and pressure potential.

Question 27

If the water potential in a cell is higher than its surroundings, does water flow into or out of that cell? Explain your answer.

Answer 27

Water moves from high to low water potential, so it will come out of the cell

Question 28

Hypotonic Solution Animals and plants

Answer 28

Animal= lysed , plants = turgid

Question 29

Hypertonic Solution Animals and Plan

Answer 29

Animals= shriveled, plasmolyzed