AGENDA – 10/5/15

• Take out notebooks! DO NOT GLUE ANYTHING IN YET!

Set-up New Unit and TOC pages in notebookWarm-up: Plasma MembranePlasma Membrane Notes

Cover Page• On the next page make a cover page for the next unit ONLY

(we will make a TOC for each unit as we go through the year.)

Unit 2: Cellular Processes, DNA Structure and Cell Division

Unit 2 Table of Contents• On the back page make a table of contents for the next unit

ONLY (we will make a TOC for each unit as we go through the year.)

• Set up this one page like this below….

2. Once you have your pages set up, write in your first two entries:

10/510/5 – 11/13 Bell-Ringers

Unit 2.1 SPMS

1-45

Progress Monitoring Sheet• DO NOT FILL THIS OUT YET!!!! (if you want to lightly pencil

through it so you can see what you are familiar with now, you can…..BUT, we will fill this out together about a week before the test so you can see what you need to work on/get help with before the test)

• These things should be in your table of contents and secured in your book

1. Bell-Ringers2. Progress Monitoring Sheet for Unit 2.1

1. On pages 1-4, divide the page into five sections to put your bell-ringers in this week (like below).

2. In the first box, Put the date and answer the bell question inside that box…We will use these entries for the next six weeks.

Bellringers

1

Date

Date

Date

Date

Date

Just like this!

Bell-ringer: 10/5/15

1. Name three things you know about the plasma membrane.

• Identify the structure and function of the cell’s plasma membrane

Today’s Objective:

The plasma membrane is a boundary around ALL cells that helps maintain

homeostasis.

PLASMA MEMBRANE

Plasma Membrane

It is the plasma membrane’s job tomaintain HOMEOSTASIS by:

• allowing waste products to leave the cell.

• keeping water and nutrient levels at a balance- if (there are too many, it will let some out).

• allowing nutrients and water into the cell.

PLASMA MEMBRANE Selective Permeability : allows some molecules into

the cell while keeping others out.(picky about what goes in and out)

PLASMA MEMBRANE

Glycerol Molecule

Two Fatty Acid Chains

Phosphate Group

Most of the plasma membrane is made of phospholipids.

Side Question:Since these are lipids,

discuss with your group-

What organelle in the eukaryotic cell makes

phospholipids?

This means two layers (or a sandwich) of phospholipids.

WHAT IS IT MADE OF?

OUTSIDE CELL

INSIDE CELL

PLASMAMEMBRANE

The plasma membrane is referred to as a phospholipid bi-layer

The head of the phospholipid molecule is attracted to water, whereas, the two fatty acid tails are repelled by

water.

PLASMA MEMBRANE

POLAR, attracted to water

NON-POLAR, repelled by water

hydrophilic

hydrophobic

There are watery environments inside and outside the cell. Therefore the phospholipid layers look like a sandwich, with the

head ends facing the watery environments they are attracted to, and the tail ends being the inside of the sandwich, away from the water.

PLASMA MEMBRANE

The cholesterol prevents the fatty acid chains of the phospholipids from sticking together.

CholesterolMolecule

PLASMA MEMBRANE

PLASMA MEMBRANE

Transport Protein

Proteins also span the entire plasma membrane.

Transport Proteins help the membrane be selectively permeable.

They move ‘selected’ substances through.

PLASMA MEMBRANE

Plasma membrane

Transportprotein

The fluid mosaic model describes the plasma membrane as a flexible boundary of a cell.

The phospholipids move within the membrane.

PLASMA MEMBRANE

“Fluid” because it moves like currents in a lake.

PLASMA MEMBRANE

“mosaic” because the proteins that are found throughout the membrane create a mosaic-type pattern on the surface.