Looking Inside Cells

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WEDNESDAY 9/23/15

Learning Goal:

Identify cell parts and explain their function

Homework:

Packet pages 29-

32 due on Friday!

Warm-up:

Turn to page 29 of your packets.

Write two questions you have about the illustrations.

WARM-UP

LOOKING INSIDE CELLS

C H A P T E R 2 S E C T I O N 4

INTRODUCTION

Organelles

Tiny structures that carry out specific functions within the cell

Compare to organs in your body…

CELL WALL

Rigid layer of nonliving material that surrounds the cells of PLANTS

Function: helps to protect and support the cell

Made of cellulose

Animal cells DO NOT have cell walls

CELL MEMBRANE

In cells with cell walls, the cell membrane is located just inside the cell wall

In other cells, the cell membrane forms an outside boundary

Function: controls what substances come into and out of a cell

PARTS OF THE NUCLEUS

Nucleus

Acts as the “brain” of the cell

The cell’s control center, directs cell’s activities

Nuclear envelope

Nucleus is surrounded by this membrane

Materials pass in and out of the nucleus through pores in this structure

Chromatin

Contains instructions that direct the functions of a cell

Thin strands, contain genetic material

Nucleolus

Where ribosomes are made

THE NUCLEUS

ORGANELLES IN THE CYTOPLASM

Cytoplasm

The region between the cell membrane and the nucleus

Clear, thick, gel-like fluid

Many organelles are found in the cytoplasm

MITOCHONDRIA

Convert energy in food molecules to energy the cell can use to carry out its functions

“powerhouse”

ENDOPLASMIC RETICULUM

Passageways carry proteins and other materials from one part of the cell to another

Mail truck

RIBOSOMES

Function as factories to produce proteins

Sometimes attached to the endoplasmic reticulum or float in cytoplasm

GOLGI BODIES

Receive proteins and other newly formed materials from the endoplasmic reticulum, package them, and distribute them to other parts of the cell

Mail room

CHLOROPLASTS

Capture energy from sunlight and use it to produce food for the cell

Only in plant cells

VACUOLES

Storage area of cells (food and other materials)

Plants cells have ONE large vacuole

Animal cells have many small vacuoles, or none at all

LYSOSOMES

Small, round structures containing chemicals that break down certain materials in the cell

“garbage truck”

SPECIALIZED CELLS

In many-celled organisms, the cell are often quite DIFFERENT from each other

Cells are specialized to perform specific functions

Cells ---- Tissues ---- Organs ---- Organ Systems

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