GHSGT Science Review

1
GHSGT Science Review

• Domain 1 Cells and Heredity
• Cells 3
• Ppt 3

2
What We Will Be Covering

• Types of eukaryotic cells
• Reproduction
• Transfer
• Homeostasis

3
Types of Eukaryotic Cells

• Somatic
• Greek for body
• All cells in the body except the sex cells
• Found in the bones, skin, organs, tissues,
  blood
• Reproduce by Mitosis
• Germ
• The Sex Cells
• Sperm and Ova
• Reproduce by Meiosis

4
Reproduction

• Asexual
• Does not involve fertilization, meiosis, or
  formation of gametes
• Produces an exact Replica (clone)
• Binary Fission
• Budding
• Regeneration
• Spore Formation

5
Reproduction

• Sexual
• Usually egg and sperm
• sex cells formed by meiosis
• Sex cells are haploid (1/2 each pair of
  chromosomes)
• Offspring receives 1 chromosome for each pair
  from each parent

6
Cellular Transfer

• Passive Transport
• The movement of chemicals and substances across
  the cell membrane without the use of energy
  (ATP).
• Diffusion
• The movement of molecules across a
  concentration gradient. High to Low. No ATP is
  used.
• Facilitated Diffusion
• Movement involving protein molecules. No ATP is
  used.
• Diffusion Video http//popehs.typepad.com/ghsgtpr
  ep/science.html

7
More Passive Transport

• Osmosis
• The movement of a solvent across a cell membrane
  from high concentration to low. No ATP is
  required.

8
Transport Uses ATP

• Active Transport
• The movement of molecules and chemicals
  across cell membranes requiring the use of ATP.
  Moves against the concentration gradient.
  Requires a carrier molecule.
• Active Transport Video http//popehs.typepad.com/
  ghsgtprep/science.html

9
Concentration Gradients
10
Homeostasis

• Video Homeostasis Cell Characteristics
• http//popehs.typepad.com/ghsgtprep/science.html