tuesday, february 14, 2012 homework: quiz block day word wall sheet due block day all makeup work...
TRANSCRIPT
Tuesday, February 14, 2012Homework:
•QUIZ BLOCK DAY
•WORD WALL SHEET DUE BLOCK DAY
•All makeup work should be completed during tutorial today. No makeups after chapter quiz…
What does this have to do with Biology?
Recap of Sally Snowboarder’s Cellular Transport
• Oxygen Transport: Simple Diffusion
• Carbon Dioxide Transport: Simple Diffusion
• Glucose Transport: Facilitated Diffusion
• Amino Acid Transport: Active Transport
Simple diffusion
OXYGEN TRANSPORT CARBON DIOXIDE
TRANSPORT
Facilitated diffusion
Carrier protein
GLUCOSE TRANSPORT
ATP
• MAKE A LOGBOOK ENTRY-
Entry9: Cell Transport Quiz Practice- 2/14/12
• Without looking at your logbook/notes—
Tell me what this quiz will be about.
• What are at least two big questions that you feel sure you will be asked?
For each of the entries you just listed– Determine what the main idea(s) are:What was the point of the activity/lab/discussion and what did we learn?
• EGG DEMO—
• WATER ACROSS A MEMBRANE LAB—
• DIFFUSION-OSMOSIS—
• MEMBRANE STRUCTURE—
• SALLY SNOWBOARDER—
SALT/SOLUTE CONCENTRATION IS VERY IMPORTANT BECAUSE A CELL GAINS OR LOSES WATER BASED ON THE INTERNAL/EXTERNAL SALT CONCENTRATION. EXCESSIVE WATER LOSS CAN CAUSE THE CELL TO SHRINK AND DIE. EXCESSIVE WATER GAIN CAUSES THE CELL TO SWELL AND BURST
Corn syrup (Karo light) Egg whitesWater
More concentrated solution OUTSIDE cell
Less concentrated solution inside cell
More concentrated solution INSIDE cell
Less concentrated solution outside cell
Same concentration inside and outside of
cell
(CONTROL)
OVERALL WATER MOVED OUT/EGG LOST
MASS
OVERALL WATER MOVED IN/EGG GAINED
MASS
WATER MOVED IN AND OUT/MASS STAYED ABOUT
THE SAME
Question: 1a
More concentrated solution OUTSIDE
tubeLess concentrated solution inside cell
More concentrated solution INSIDE tube
Less concentrated solution outside tube
OVERALL WATER MOVED
OUT/TUBE LOST MASS
OVERALL WATER MOVED
IN/TUBE GAINED MASS
WATER IN TUBE
SUGAR SOLUTION IN BEAKER
W
S
S
W
SUGAR SOLUTION IN TUBE
WATER IN BEAKER
Question: 1a
Plain water in cell beginning mass 7.6 g
Plain water in cell ending mass 4.3 g
Water moved out of the cell into the beaker
Sugar water in beaker
Question: 1a
Sugar water in cell beginning mass 5.2g
Plain water in beaker
Water moved from the beaker into the cell
Sugar water in cell ending mass 8.1g
Question: 1a
EXPLAIN OsmosisTwo factors cause osmosis:1. A semipermeable membrane allows water
molecules to move back and forth through the membrane, but not solute molecules
2. Water molecules “stick” temporarily to any dissolved solute molecules.
As a result, water molecules spend more time and accumulate on the side of the membrane with the higher concentration of dissolved solutes.
Question: 1b
2a. Movement of molecules through membranes made only of
phospholipids (phospholipid bilayer)Molecule
nameSize
(large or small)
Electric charge
(nonpolar, polar charge, or strong charge)
Able to cross lipid bilayer membranes between phospholipid molecules?
(Yes or No)
CO2(carbon dioxide)
Small Nonpolar YESO2 Small Nonpolar YESH2O Small Polar YESglucose Large Polar NOIon Small Strong
chargeNO
WATER– THE SOLVENT—THE THING THAT DISSOLVES THE SOLUTE
STARCH– THE SOLUTE—THE THING THAT GETS DISSOLVED IN WATER (SOLVENT)
2b
Iodine in cell
Starch in beaker
Location of color change shows that only iodine crossed
Question: 2b
IODINE (SMALL MOLECULE) INSIDE
STARCH (LARGE MOLECULE)
OUTSIDECOLOR
CHANGE OBSERVED IN
BEAKER
COLOR CHANGED
OBSERVED IN TUBE
Iodine Starch
Starch Iodine
STARCH (LARGE MOLECULE) INSIDE
IODINE (SMALL MOLECULE)
OUTSIDE
Question: 2b
DIFFUSION IS THE RANDOM MOVEMENT OF PARTICLES FROM HIGH TO LOW CONCENTRATION
Question: 3
.4. OSMOSIS HAPPENS BECAUSE THE SEMIPERMEABLE MEMBRANE ALLOWS WATER TO CROSS-BUT NOT THE SOLUTE AND ATTRACTION BETWEEN THE SOLUTE AND WATER HOLD IT ON THAT SIDE LONGER—CAUSING WATER TO BUILD UP ON THE SIDE WITH THE HIGHEST CONCENTRATION
5. CONCENTRATION STOPS CHANGING/THE MOLECULES HAVE EVENLY DISTRIBUTED—BUT THAT THEY CONTINUE MOVING RANDOMLY AROUND THE CONTAINER—MOLECULES NEVER STOP MOVING
SOLUTION IS HYPOTONIC TO CELL. MORE WATER MOVES IN
6a.
SOLUTION IS HYPERTONIC TO CELL. MORE WATER MOVES OUT
Question: 6b
SOLUTION AND CELL ARE ISOTONIC. WATER MOVES IN AND OUT EQUALLY
6c.
CELL IS IN A HYPOTONIC SOLUTION
(CELL IS HYPERTONIC)
CELL IS IN A HYPERTONIC SOLUTION
(CELL IS HYPOTONIC)
CELL IS IN AN ISOTONIC SOLUTION
6.
Water molecules
Water
Polar head faces out towards water because of the attraction
Nonpolar tails face inward so they are protected from water
Cell membrane structure
Passive transport
Simple diffusion Facilitated diffusion
Carrier protein
Co
ncen
tration
Grad
ient
CO2
SMALL, UNCHARGED MOLECULES MOVE THIS WAY
GLUCOSE
LARGER, UNCHARGED MOLECULES MOVE THIS WAY
Question: 7a Question: 7b
Active transport
Carrier protein
Co
nce
ntr
atio
n G
rad
ien
t
Calcium ion (Ca+)
LARGE OR CHARGED MOLECULES MOVE THIS WAY
MOVEMENT IS LOW TO HIGH CONCENTRATION
THIS PROCESS REQUIRES ENERGY (ATP)
ATP
Question: 7c
SIMPLE DIFFUSION
FACILITATED DIFFUSION
ACTIVE TRANSPORT
HIGH TO LOW CONCENTRATION
(MORE TO LESS)
SMALL, UNCHARGED MOLECULES
DIRECTLY ACROSS THE MEMBRANE BILAYER
NO ENERGY REQUIRED
PASSIVE
HIGH TO LOW CONCENTRATION
(MORE TO LESS)
BIG/LARGE, UNCHARGED MOLECULES
REQUIRES A PROTEIN CHANNEL/CARRIER
NO ENERGY REQUIRED
PASSIVE
LOW TO HIGH CONCENTRATION
(LESS TO MORE)
BIG/LARGE, CHARGED MOLECULES
REQUIRES A PROTEIN CHANNEL/CARRIER
ENERGY REQUIRED
ACTIVE
• Question: 8