Introduction to the Cell

Notes: Cell basics Essential Question: What are the similarities and differences between the two types of cells?

Levels of organization ATOMS BIOMOLECULES ORGANELLES **CELLS** TISSUE ORGAN ORGAN SYSTEM ORGANISM

List the 8 Levels of Organization Turn to a Partner List the 8 Levels of Organization

Top ten facts about the cell…

#10: Cells are too small to be seen without magnification #9: Eukaryotic cells are 10 times larger than prokaryotic cells, simply because they have a nucleus #8: Prokaryotic single-celled organisms were the earliest forms of life on earth #7: Cells have varying life spans

#4: When you donate blood, you give up 5.4 billion cells #3: There are 30 billion cells in your brain #2: Cells commit suicide #6: Cells contain genetic material #5: Cells contain structures called organelles which carry out specific functions

#1: There are more bacterial cells in the body than human cells

2 Types of Cells 1) Prokaryotic cells pro = before kary = nucleus DNA 1) Prokaryotic cells pro = before kary = nucleus Lack membrane-bound organelles and nucleus DO contain small ribosomes

2 Types of Cells 1) Prokaryotic cells DNA 1) Prokaryotic cells ALL prokaryotic cells are bacteria Domains of Life: Eubacteria & Archaebacteria

2 Types of Cells 2) Eukaryotic cells eu = true kary = nucleus Domain Eukarya All other organisms

Quick check – Why is this cell eukaryotic? Because it has a cell wall. Because it contains DNA. Because it has membrane-bound organelles. Because it does not have DNA. Nucleus Nucleolus Chromosomes Organelles Plasma membrane

Label the following images as prokaryotic (P) or eukaryotic (E) cells:

Cell Specialization Cells in multicellular organisms are specialized to perform particular functions

Cornell Summary & Study Questions