Tuesday, February 14, 2012 Homework: 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 whites Water 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 tube Less 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 Osmosis Two 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 name Size (large or small) Electric charge (nonpolar, polar charge, or strong charge) Able to cross lipid bilayer membranes between phospholipid molecules? (Yes or No) CO 2 (carbon dioxide) SmallNonpolar YES O2O2 SmallNonpolar YES H2OH2O SmallPolar YES glucose LargePolar NO Ion SmallStrong charge NO

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) OUTSIDE COLOR CHANGE OBSERVED IN BEAKER COLOR CHANGED OBSERVED IN TUBE Iodine 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 6.6.

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 diffusionFacilitated diffusion Carrier protein Concentration Gradient CO 2 SMALL, UNCHARGED MOLECULES MOVE THIS WAY GLUCOSE LARGER, UNCHARGED MOLECULES MOVE THIS WAY Question: 7aQuestion: 7b

Active transport Carrier protein Concentration Gradient 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