1. Unit 6 Notes: Cell Basics
Monday
Unit 6 Notes: Cell Basics

2. (1) Big Ideas: All cells need to divide and make more cells.
Cells come from pre-existing cells.
Non-Sex Cells divide using Mitosis.
Sex-Cells divide using Meiosis.
If a cell is copied incorrectly it is either terminated, or can lead to cancer.

3. (2) Cell Review Cell: Basic Unit of Life.
Eukaryotic  With A Nucleus
Prokaryotic  No Nucleus
Must Complete “Life Processes”:
Homeostasis
Reproduce
Digest & Excrete
Respond & Adapt

5. (3) The Nucleus & DNA
Nucleus: Organelle in eukaryotic cells, which stores nucleic acid (DNA).
Nucleic Acid = Genetic Information
DNA contains instructions for making cell parts
DNA:
Deoxyribonucleic Acid
A type of nucleic acid which stores cellular genetic information.
Condenses during Cell Division… DNA  Chromatin  Chromosomes

10. (4) Genes & Alleles A gene is a specific sequence of DNA.
Each gene comes in different “flavors”:
Allele: Variation of a gene.
Dominant or Recessive

13. (5) Multicellular Organisms
Multicellular: Organisms which are made of more than one cell.
Multicellular  More Complex:
Cells are specialized (each has unique function)
Cells form Tissues  Organs  Organ Systems
Examples:
Plants
Animals

15. (6) Why Divide?
Repair + Replace
Reproduce
Grow

16. (7) Mitosis vs. Meiosis Non Sex Cells (Somatic Cells)
Start w/1 Cell, End w/2 Identical
2n  2n
Sex Cells (Gametes, Sperm/Egg)
Start w/1 cell, End w/4 unique
2n  n