Transcript Life Science Unit 2 - secondary

Life Science
Unit 2
Chapter 2
Lesson 1
Start-up
Packet Info:
Objectives
 Take packet to lab table
 Identify bacteria as an
and make day 2
observations
 Answer the following
questions in your packet:
organism without a nucleus
 Observe and describe
bacteria
 About haw many people
live on the Earth?
 About how many bacteria
are in 1g of garden soil?
Bacteria
 One-celled organisms without a nucleus
 Kingdom prokaryotae
 Bacteriologists
 Microbiologists
 How many ID’ed?
 Are they all discovered?
 Only seen with microscopes
Bacteria Structure
 Tough protective cell wall
 Determines shape
 Allows for adverse living conditions
 Thin slimy layer outside cell wall-capsule
 Protects from destructive chemicals
 Cell Membrane- controls substances moving
 Cytoplasm- jelly like substance
 Contains enzymes and genetic info
 Some bacteria has flagellum
 Thin whip like structure
 Helps organisms move through liquids
Grouping
 Cocci-round bacteria
 Bacilli- rod shaped bacteria
 Vibrios- bent rods
 Spirella and Spirochetes- spiral shaped
We go together like…
 Descriptive prefixes for linked bacteria
 Diplo- means pair
 Staphylo- means cluster
 Strepto- means chain