Worksheet Characteristics Of Bacteria

SBI3C Name:

Characteristics of Bacteria Worksheet

Big Idea!

Bacteria are microscopic organisms that lack a membrane-bound nucleus and membrane-bound organelles.

Bacteria are usually unicellular prokaryotes. Bacteria reproduced by binary fission or conjugation. Bacteria can survive harsh conditions by forming endospores.

Plasmids endospores binary fission conjugation

Part A

Match each lettered part of the diagram to its cell structure by writing its letter on the line provided.

_____ 1. DNA

_____ 2. Cell membrane

_____ 3. Flagella

_____ 4. Cell Wall

_____ 5. Pili

_____ 6. Cytoplasm

Part B

Match each term in Column B with its description in Column A by writing its letter on the line provided.

_____ 1. small pieces of circular DNA a. binary fission _____ 2. chromosome replication, followed by cell division b. conjugation c. endospore _____ 3. special, dehydrated cell formed when conditions are unfavorable _____ 4. exchange of genetic material through cell-to-cell contact d. pili _____ 5. hair-like structures on the surface of bacteria e. plasmid

Part C

1. How does binary fission differ from conjugation?

2. What is a way in which Bacteria can share genetic information?

3. What is the main feature that distinguishes Bacteria cells from cells of other organisms in other kingdoms?

4. Name the 4 shapes of bacteria.

a. b. c. d.

Archaebacteria and Eubacteria

1. What are three types of environments in which archaebacteria are found?

2. Where is the genetic material of a bacterium found?

3. What structure do some bacteria use to move?

Lesson Key Words Eubacteria Archaebacteria Unicellular Prokaryotic Asexual reproduction Binary fission Methonogen Halophilic Thermophilic Compare/Contrast Archaea and Eubacteria

Archaea ONLY Eubacteria ONLY Archaea & Eubacteria

TERMS: Unicellular Prokaryotic Plasmid DNA Cell wall Pili flagella thrive in extreme conditions can live without oxygen thermophiles methanogens halophiles live everywhere form colonies some aerobic and some anaeorobic come in different shapes E.coli is an example Peptidoglycan in cell wall Board Notes

Bacteria Structure - What do you see?

Nucleus?

Number of cells?

Cell wall?

Other structures?

Other organelles?

Archaea – early or primitive - Derived from one of the oldest groups of living organisms on earth - They thrive under extreme conditions (conditions that other organisms cannot tolerate) - Many live without oxygen - 3 types: thermophiles, methanogens, halophiles - Thermophiles live in extremely HOT environments (over 45) like hot springs - Methanogens grow on H2 and CO2 to procude methane gas, foundin places LOW in O2 like deep sea vents, swapms, intestines (these are decomposers) - Halophiles live in very salt environments

Eubacteria – more common bacteria that are found everywhere - Shape - (coccus, bacillus, spirillus), formation of colonies - Cell wall composition – amount of peptidoglycan in their cell wall - respiration: aerobic (use oxygen) and anaerobic bacteria (don’t use oxygen, use sulphur) - Anaerobic example  (e. Coli is an example of this). - what they eat (autotrophs, chemosynthetic, heterotrophs) - autotrophs – make their own food from inorganic substances - heterotrophs – break down organic compounds for energy (most bacteria are heterotrophs) - chemosynthetic – use chemical reactions as their energy source optimum conditions for bacteria to survive? – constant temperature, standard food source