10/20/15

Starter:

How do passive and active transport help a cell maintain homeostasis?

Practice:Glue notes here

10/20/15

Cell Membrane

Application/Connection/Exithttps://www.youtube.com/watch?v=6fhbbFd4icY

Watch video and write 5 facts.1.2.3.4.5.

Then complete review sheet. Answer questions on exit

slide on back. Turn in.

Cell Membrane 77 78

EQ: How does structure relate to function in living systems from the organismal to cellular level?

Agenda

•1. Starter•2. notes

•3. Video Review •4. Exit

Date Lecture/ Activity/ Lab Page10/8 Cell Comparisons

61-64 10/9 Cell Writing 65-

66 10/13 Eukaryotic and Prokaryotic Cells

67-6810/14 Eukaryotic and Prokaryotic Poster 69-

7010/15 Osmosis in Eggs 71-

7210/16 Osmosis Lab Day II and Quiz 73-

7410/19 Osmosis Lab Day III 75-

7610/20 Cell Membrane 77-78

Table of Contents

Functions1. Controls what enters / exits cell.2. Protects cell.3. Supports cells.

Cell Membrane

A cell membrane has 3 main functions

Cell membrane surrounds cell.

Structure1. Phospholipid bilayer2. Proteins (integral and peripheral)3. Carbohydrates

Cell Membrane

A cell membrane is made of 3 types of organic molecules

Most of a cell membrane is made of a phospholipid bilayer

a) Double layer of phospholipid molecules.b) Fluid and flexible.c) Allows some small, non-polar molecules

through, but blocks large or charged molecules.

Cell Membrane

Phospholipid bilayer

Phospholipid molecules arrange themselves into bilayer because of their special structure.

Cell Membrane

Phospholipid molecules have a “head” and a “tail”

Hydrophilic head “loves” water.

Hydrophobic tail “fears” water.

H HO

HHO

Proteins are attached to phospholipid bilayer and perform many functions:

a) Integral proteins are attached to membrane. They can transport materials or carry signals in and out of the cell.

b) Peripheral proteins temporarily attach to phospholipid bilayer or integral proteins.

Cell Membrane

Integral and peripheral proteins

Some carbohydrate chains are attached to the membrane surface. These help cells identify and recognize each other.

Cell Membrane

Carbohydrates

A cell wall is a hard, flexible extra layer surrounding the cell membrane in some organisms, including: Plants Fungi Some bacteria

Cell Membrane

Cell Wall

Exit : Write on back of Review worksheet

1. Summarize the main functions of a cell membrane and why is this important.The main functions of a cell membrane include…This is important because…………….

2. List and illustrate the main structures of a cell membrane, in terms of phospholipids, proteins and carbohydrates.The main structures of a cell membrane includes… Illustration of cell membrane: …

3. Compare and contrast cell membranes to cell walls.In comparison, a cell membrane and cell wall both _______________________. In contrast, a cell membrane is _____________________________________________, while a cell wall is ___________________________________________________________.

10/20/15

Starter:

How do passive and active transport help a cell maintain homeostasis?

Practice:Glue notes here

10/20/15

Cell Membrane

Application/Connection/Exithttps://www.youtube.com/watch?v=6fhbbFd4icY

Watch video and write 5 facts.1.2.3.4.5.

Then complete review sheet. Answer questions on exit

slide on back. Turn in.

Cell Membrane 77 78

EQ: How does structure relate to function in living systems from the organismal to cellular level?