Ms. Shaffren

Biology I

Period 1

6/13/07

 

 

Approximate time: 50 minutes

 

 

Objective: The student will differentiate between prokaryotic and eukaryotic cells (3a)

 

Materials: Handouts, typing paper and pens or pencils, board and markers.

 

Warm-up

 

Quiz

 

What are the class expectations?

What are the class consequences?

What are the procedures for sharpening a pencil? (2 parts)

What is the procedure for getting out of your seat durig class? (2 parts).

 

 

Set:

 

What’s the difference between a book you would read in elementary school and a Hemingway novel? What does the novel have that the young children’s book doesn’t? What do they both have? Also, their both books.

 

 

Just as there are big structural differences between simple and advanced books, there are two basics divisions of simple vs. complex cells.

 

 

Connection to yesterday’s natural selection lesson. Yesterday in natural selection we spoke about classifying items according to similarities and differences, and I mentioned that today we would talk about classifying organisms. One major difference between organisms that is often used to classify them actually has to do with the cell. In this section of the class on the cell, we will be talking today about one major differences between organisms that is often used as one of the more general categories of classification; it’s one trait used to classify organisms.

-Indicate that general means including more organisms.

 

 

Procedure

 

1) Hand out two drawings of cells; one is a prokaryote, and one is a eukaryote.

2) Give students three minutes to look at each of the pictures and write down all of the differences between the two.

3) Give students five minutes to look up the definition of prokaryotes and eukaryotes, decide which is which, and write the appropriate name and definition under near each picture.

4) Give students five minutes to list characteristics of each of those two kinds of cells on the back of the pictures, without looking at the definitions.

5) Three minutes discussion- sharing.

6) Draw a Venn Diagram on the board and ask students to copy the diagram in their notes. A big diagram with plenty of room for overlap and each circle labeled.

7) Explain how a venn diagram works, using an example with “cars” and “motorcycles”

8) Give students five minutes to fill in the diagram for prokaryotic and eukaryotic cells.

9) Four minutes sharing, filling in the classes version, allowing students to make corrections.

10) Drawing activity 5 minutes.

    Split Students into pairs; have them arrange their desks so that they are back to back.

    Whisper a type of cell to the person on the left; have the one on the right take out a blank sheet of paper and pen or pencil

    The person on the left must describe the cell to the person on the right, who must draw it.

    Students may not use the word “ organelle”, the names of any of the organelles, including the word “nucleous”.    

 

 

The first group to (fairly determine the cell type will receive five points extra credit on the day’s quiz .

11) Wrap- up.

 

 

Closure: Ask each student, in turn, questions. Call each student, give a trait, and have the student identify cell type. Review objectives. Indicate that tomorrow will be plant versus animal cells.

 

 

Assessment:

 

Informal: The teacher will observe student participation (M) in classroom discussion and activities.

 

Formal: The student will take a graded (D) quiz (M) on the difference between prokaryotic and eukaryotic cells (C).

 

Teacher's Notes for this lesson are as follows (nice to have a hard copy even if you know it):

 

Prokaryotic

 

    small

    simple

    no nuclei

    still have cell membrane and cytoplasm

    no other specialized organelles

    all bacteria; single celled organisms

    examples: Escherichia coli, live in intestines

           Staphylococcus aureus, cause skin infections

    still grow, reproduce, carry out changes in the environment, some are mobile

 

Eukaryotes

 

    have nuclei

    have cell membrane

    have cytoplasm

    have organelles- specialized structures that perform important cellular functions

    some eukaryotics are unicellular

    many are large multi-cellular organisms

    all plants, animals, fungi, and many microorganisms are eukaryotes