bacteria are single- celled organisms without a nucleus bacteria are the simplest form of life;...

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BACTERIA ARE SINGLE- CELLED ORGANISMS WITHOUT A NUCLEUS • Bacteria are the simplest form of life; there are more bacteria in your mouth than people on the planet. • BACTERIA & ARCHAEA are the SMALLEST LIVING things. • BACTERIA & ARCHAEA are found in MANY ENVIRONMENTS • BACTERIA MAY HELP OR HARM OTHER ORGANISMS

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Page 1: BACTERIA ARE SINGLE- CELLED ORGANISMS WITHOUT A NUCLEUS Bacteria are the simplest form of life; there are more bacteria in your mouth than people on the

BACTERIA ARE SINGLE-CELLED ORGANISMS

WITHOUT A NUCLEUS• Bacteria are the simplest form of life; there are

more bacteria in your mouth than people on the planet.

• BACTERIA & ARCHAEA are the SMALLEST LIVING things.

• BACTERIA & ARCHAEA are found in MANY ENVIRONMENTS

• BACTERIA MAY HELP OR HARM OTHER ORGANISMS

Page 2: BACTERIA ARE SINGLE- CELLED ORGANISMS WITHOUT A NUCLEUS Bacteria are the simplest form of life; there are more bacteria in your mouth than people on the

BACTERIA & ARCHAEA are the smallest living things

• Bacteria are the simplest kind of life known (1cell with loops of genetic material-no nucleus; reproduces via binary fission)

• Bacteria have cell walls surrounding & protecting the soft cell membrane.

• Classify bacteria by external shape: • SPIRAL-shaped occur in single strands• ROD-shaped occur singly or in chains• ROUND-shaped occur singly, in pairs, chains or

clusters.

Page 3: BACTERIA ARE SINGLE- CELLED ORGANISMS WITHOUT A NUCLEUS Bacteria are the simplest form of life; there are more bacteria in your mouth than people on the

Page 4: BACTERIA ARE SINGLE- CELLED ORGANISMS WITHOUT A NUCLEUS Bacteria are the simplest form of life; there are more bacteria in your mouth than people on the

ARCHAEA & BACTERIA IN MANY ENVIRONMENTS

• ARCHAEA: single-celled organisms living in the most extreme environments (hot, cold, salty, etc.)

• METHANOGENS: archaea that make methane & die if exposed to oxygen (live in marshes & intestines of cows & termite)

• HALOPHILES: archaea that live in salty lakes & ponds

• THERMOPHILES: archaea that live in extreme heat or cold. (hot springs, under water volcanic vents, or buried deep in ice).

Page 5: BACTERIA ARE SINGLE- CELLED ORGANISMS WITHOUT A NUCLEUS Bacteria are the simplest form of life; there are more bacteria in your mouth than people on the

ARCHAEA & BACTERIA

• Some bacteria have chlorophyll & use sunlight for energy. (important food source in oceans & give off O2 as well)

• Many bacteria are grouped by role they play in environment:

• PRODUCERS: transform energy from sunlight to usable forms.

• DECOMPOSERS: break down materials in dead or decaying organisms. (good recyclers!)

• PARASITES: organisms that live off a host and harm that host

Page 6: BACTERIA ARE SINGLE- CELLED ORGANISMS WITHOUT A NUCLEUS Bacteria are the simplest form of life; there are more bacteria in your mouth than people on the

Page 7: BACTERIA ARE SINGLE- CELLED ORGANISMS WITHOUT A NUCLEUS Bacteria are the simplest form of life; there are more bacteria in your mouth than people on the

Helpful v. Harmful Bacteria• Decomposers break down

material that other organisms can use to build up.

• Can break down & treat sewage to clean water or oil spills

• Can convert nitrogen gas into usable nitrogen compound for plants to use in building proteins to grow.

• Methanogen archaea also help cows & termites digest cellulose for food.

• Some diseases are caused by bacteria (tuberculosis, cholera, infant diarrhea)

• Cause symptoms by:• Invade body, multiply &

dissolve cells• Poison with chemicals they

made & released• Poison with chemicals that are

part of themselves• VACCINES are used to help

organisms get ready to fight bacteria they may be exposed to in the future.

Singled-Celled Organisms Protists Bacteria Viruses

1 BACTERIA Bacteria - small one celled Bacteria like a warm, dark, and moist environment They are found almost everywhere: -water-air -soil-food -skin-inside

Basic Bacteriology. Bacteria Bacteria are single-celled organisms Contain no membrane bound nucleus Termed prokaryotes = pre nucleus Pro = pre karyote

Prokaryotes - Single celled organisms - No membrane bound organelles - ex: no nucleus or mitochondria - Free floating DNA - Bacteria are prokaryotic

5 Kingdoms Moneran One celled One celled No separate nucleus No separate nucleus Example: bacteria Example: bacteria

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BACTERIA WHAT IS BACTERIA – a single celled organism that is a prokaryote THREE BASIC SHAPES OF BACTERIA ARE ROD-LIKE SPHERICAL SPIRAL

Kingdom Monera - stjosephcs.org · 2 BACTERIA Bacteria - small one celled monerans Bacteria like a warm, dark, and moist environment They are found almost everywhere: -water -air

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18.4 Bacteria and Archaea KEY CONCEPT Kingdoms Eubacteria and Archaeabacteria are composed of single-celled prokaryotes

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An introduction to bacteria They Are Everywhere. Prokaryotes Prokaryote: Single-celled organism that lacks a true nucleus (also called bacteria) Prokaryote:

Prokaryotes (Bacteria & Archaea) Bacteria... · Prokaryotes (Bacteria & Archaea) Prokaryotic cells (“before” nucleus) •lack a nucleus & other organelles •small, single-celled

Prokaryotes (bacteria) and Gram Staining · Prokaryotes (bacteria) and Gram Staining Gram positive and Gram negative. BTEC101, Day 5 Why are we learning this? ... Single celled organisms

BACTERIA AND VIRUSES - Loudoun County Public Schools · BACTERIA AND VIRUSES IDENTIFYING BACTERIA: prokaryote: _____-celled no membrane bound _____ much _____ than eukaryotes

BACTERIA SIMPLE ONE-CELLED ANIMAL. COCCI ROUND OR SPHERICAL IN SHAPE

18.4 Bacteria and Archaea KEY CONCEPT Bacteria and archaea are both single-celled prokaryotes

KEY CONCEPT Bacteria are single-celled organisms … · decomposer p. 291 parasite p. 291 ... plants, fungi, or protists. ... Archaea are similar in size to bacteria, but share more

The Basics of Bacteria. What are bacteria? Bacteria are single-celled prokaryotes Bacteria are single-celled prokaryotes DNA is not located in a nucleus

BACTERIA Prokaryotes are single-celled organisms that do not have a membrane-bound nucleus. Prokaryotes are single-celled organisms that do not have a

Bacteria Reproduction: Not quite the same!. What type of cells are bacteria? Prokaryotic cells: Single celled Have a single strand of DNA and some plasmids

Bacteria and Viruses Chapter 18. Bacteria Prokaryotes-single-celled organisms without an nucleus Prokaryotes-single-celled organisms without an nucleus