lesson 2 cells introduction what is a cell? what are the two main characteristics of cells?

Lesson 2 Cells Introduction

What is a cell?

What are the two main characteristics of cells?

Do Now

• Take out your word generation packet. page 5

• Do you think taking a graduation exam will lower SAT scores?

Do Now

Know Want to know Learned

The_Magic_of_Cells.wmv

Essential Questions

1. What is a cell?

2. What are the two main characteristics of cells?

Vocabulary

Cells

Cell membrane

Cytoplasm

Cell wall

Organelle

Nucleus

Chloroplast

Mitochondrion

Ribosome

Endoplasmic reticulum

Golgi body

Tissue

organ

Summarization Activity

• What is a cell?

Do Now

• Review cell vocabulary.

Essential Question

1. What is a cell?

2. What are the two main characteristics of cells?

Assignment

1. Turn to page 38.Life Science Book

2. Read page 38-45.

3. Reread your assigned section.

4. Take notes on your assigned section.

5. Be prepared to share your notes with the class.

Common Cell Traits

1. cell membrane

2. cytoplasm

Comparing Cells

• Cells come in many sizes.

• The shape of the cell can tell you something about its function.

Cell Types

• Prokaryotic cells- cells without membrane structures- one cell organisms- like bacteria

• Eukaryotic cells- cells with membrane-bound structures like protists, fungi, plant, and animal cells.

Cell Wall

• Cell walls are tough, rigid outer coverings that protect the cell and give it its shape.

Cell Membrane

• the protective layer around the cell membrane

• The cell membrane regulates interaction between the cell and the environment.

• Water can move through it.

• Food particles and some molecules enter and waste leave through it.

Cytoplasm

• Gelatinlike substance that constantly flows inside the cell membrane.

• Many important chemical reactions occur within the cytoplasm.

• Most of a cell’s life processes occur here.

• Within the cytoplasm of a eukaryotic cell are structures called organelles.

Nucleus

• directs all activities

• is separated from the cytoplasm by a membrane

• DNA- chemical that contains the code for all the cell’s structure and activities

• Chromosomes

• A structure called a nucleolus also is found in the nucleus.

Energy Processing Organelles

• In plants, food is made in green organelles in the cytoplasm called chloroplast.

• Chloroplast contain chlorophyll which gives leaves and stems their green color.

• Mitochondria- store energy and release it.

Manufacturing Organelles

• Ribosomes are small structures on which cells make their own proteins.

• Ribosomes receive direction from hereditary material in the nucleus on how, when, and in what order to make specific proteins.

Processing, Transporting, and Storing Organelles

• The endoplasmic reticulum (ER) extends from the nucleus to the cell membrane.

• ER is a series of folded membranes in which material can be processed and moved around inside the cell.

• Golgi bodies sort proteins and other substances and package them to vesicles.

• Vacuoles store water, waste, food, and other material.

Recycling Organelles

• Lysosomes contain digestive chemicals that help bread down food molecules, waste, and worn out cell parts.

From Cell to Organism

• Many one-celled organisms perform all their life function by themselves.

• Most work with others.

• Tissue-group of similar cells that work together to do a job.

• Organs- structure made up of two or more different tissues that work together.

Do Now

Revisit your KWL chart. What did

you learn.

introducing the cell.asf

Complete the handout in your packet as you

watch the video.

Ticket out the door

1. What is a cell?

2. What are the two main characteristics of cells?