Think positive…

Essential Question: How do each of the organelles in a cell function?

1/13/12-Get your book. Set out your plant/animal diagrams.Do-Now:

1.Provide the FUNCTION of the following cell parts.

a. Nucleus f. Endoplasmic Reticulum

b.Nucleolus g. Golgi Apparatus

c. Cell membrane h. vacuole

d.Cell wall i. lysosome

e. Mitochondria j. chloroplast

Cell Membrane

The entire cell is surrounded by a thin membrane.

Function: controls which substances pass into & out of the cell–it’s selectively permeable

Structure: composed of phospholipids & proteins in a double layer or bilayer

(Cell membrane continued)

(Cell membrane continued)

Each phospholipid has a polar “head” & two non-polar “tails”

The head of the phospholipid is hydrophilic & the tails are hydrophobic. Head

Tails

Floating around in the cell membrane are different kinds of proteins.

This model is called the fluid mosaic model. The positions of the lipids & proteins is constantly changing.

(Cell membrane continued)

Organelles:

cytoplasm

Cytoplasm: lies between the cell membrane & the nucleus & contains the various organelles of the cell.

Endoplasmic reticulum (ER)- functions as intercellular highway for molecules to move from one part of the cell to another

Endoplamsic reticulum

Endoplasmic reticulum continued

There are two types of ERa. Rough ER –has ribosomes on it, transports proteins in the cell

b. Smooth ER – no ribosomes, produces lipids

Rough ER Smooth ER

Fig. 4.14, p. 65

vesicle budding from rough ER ribosome vesicle (mitochondrion) space inside smooth ER

0.5 µm

Ribosomes –make proteins, attached to the ER or float freely in the cytoplasm

ribosomes

Golgi Apparatus- packages proteins for secretion out of cell

Golgi Apparatus

Fig. 4.15, p. 65

vesiclefrom ER,about to fuse with the Golgi membrane

internal spacebudding vesicle

ROUGH ER

SMOOTH ER

GOLGI BODY

0.25 µm

Lysosomes – produced by Golgi; contain strong digestive enzymes;suicide sac

Mitochondria – powerhouses of the cell; produce ATP (energy)

Chloroplasts – found in organisms that carry on photosynthesis

Cytoskeleton: a network of long protein strands that gives the cell support & movement.

2 types:

Microfilaments Microtubules

Components of the Cytoskeleton

• Microtubules

– Help with cell

division & movement

• Microfilaments

– Help with movement

& shape

Cilia & Flagella

-hairlike structures, extend from surface of cell, assist in movement

vacuoles- storage of food, enzymes & wastes

The Nucleus- control centerSeparated from the cytoplasm by nuclear envelope (double membrane)

Contains fine strands of chromatin (DNA) which will coil up to form chromosomes

Large dark structure –nucleolus(RNA)

1/17/12Do-Now: Take out your plant/animal cell

wkst.

1.How are the cell & nuclear membranes similar? Different?

2.Give the FUNCTION of the following organelles.

a. nucleolus

b. flagella

c. lysosome

A Plant Cell An Animal Cell

Differences in Plant and Animal Cells

Differences in Plant and Animal Cells

Plant cells have:

-cell walls made of cellulose in addition to membranes

Provide structure &

support

Plant cells have:

-a large central vacuole which provides turgor pressure

vacuole

Plant cells have:

Plastids to store food or pigments

Leukoplasts – white – store starch

Chromoplasts – red, yellow, blue

Chloroplasts - green

Animal cells have…

• centrioles (during cell reproduction)

• Small vacuoles (if at all)

• lysosomes

1/18/12-Get your book & take out your homework.

Do-Now:

1. If a cell were a city, what organelles would represent the following things?

a. City Hall b. Power Plant

c. Waste Management d. UPS

2. If a cell were a factory, what organelles would represent the following things?

a. Main Office b. Doors

c. Generator d. Packaging Center

8/31/10-Pick up the book that matches your desk number.Do-Now:

Pick up & complete the word search on the shelf.

Small Group Review tomorrow before school. See me for a pass.

Test TOMORROW• GRECHO, Cell

Theory, 5 Scientists, Cell Structures & Functions

• ~55 questions– True/False

– MC

– Short Answer

– Fill In