Wednesday 2/23

1
Wednesday 2/23

• Please take out a pencil
• Colored Pencils
• Warm Up
• With the person sitting next to you, talk about
  the steps of the cell cycle. Be able to name the
  stages of the cells life and steps of mitosis.

2
Mitosis Cell Structure Review
3
Instructions

• Each group will get 3 vocabulary words.
• Each person in the group will chose 1 of the
  words and draw a picture/pictures representing
  the word as well as write a definition that is
  easy to understand.
• Pictures must take up the whole box and be
  colored and labeled if needed.

4
Eukaryotic Cells

• Have a nucleus
• Found in multi-cellular organisms some
  unicellular organisms

5
Prokaryotic Cells

• Do not have a nucleus
• Found in bacteria

6
Cell Membrane

• Thin, flexible layer
• Separates the cell from its surrounding
  environment
• Controls movement of materials into and out of
  the cell
• Helps maintain the cells internal environment

7
Cytoplasm

• Thick, jelly-like substance contained within the
  cell membrane

8
Nucleus

• Control center of the cell
• Contains the genetic material (chromatin) the
  cell needs to reproduce and function.
• Is surrounded by the nuclear membrane

9
Nuclear Membrane

• membrane that separates the nucleus from the
  cytoplasm.

10
Nucleolus

• Found inside the nucleus
• Helps make RNA
• If it malfunctions, it can cause many human
  diseases

11
DNA

• The genetic material found in all living cells.
• Contains the information needed for an organism
  to grow, maintain itself, and reproduce
• Stands for deoxyribonucleic acid

12
Chromatin

• Chromosomes are not always visible.
• They usually sit around uncoiled and as loose
  strands called chromatin.

13
Chromosome

• Worm-like / rod-like structures formed from
  chromatin during cell reproduction.
• They become distinct during the reproductive part
  of the cell cycle as the cell divides.
• Composed of DNA

14
Sister Chromatids

• Pairs of chromosomes are called Sister Chromatids
• Structures called a Centromere hold the sister
  chromatids together

15
Centrioles - Organizing Chromosomes

• Every animal-like cell has two small organelles
  called centrioles. They are there to help the
  cell when it comes time to divide.
• They are put to work in both the process
  of mitosis and the process of meiosis and move to
  opposite sides of the nucleus during cell
  division
• You will usually find them near the nucleus but
  they cannot be seen when the cell is not dividing.

16
Spindle Fibers

• Spindle fibers form a protein strand that divides
  the chromosomes in a cell during cell division.
• The spindle is necessary to equally divide the
  chromosomes in a parental cell into two daughter
  cells during both types of nuclear division
  mitosis and meiosis.

17
Aster Centrosome

• An aster is a cellular structure shaped like
  a star, formed around each centrosome during mitos
  is in an animal cell
• Centrosome is where the centrioles are organized