Bacteria
Presentation
•
Biology, Science
•
7th - 8th Grade
•
Medium
+1
Standards-aligned
Haley Drecksage
Used 7+ times
FREE Resource
17 Slides • 11 Questions
1
Bacteria Review
-Size, Shape, and Structure
-Obtaining Energy
-Reproduction
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Bacteria are microscopic, prokaryotic organisms.....
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Prokaryotes
-unicellular
-do NOT contain a nucleus
-do NOT contain other membrane bound organellES
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Bacteria Kingdoms
Archaebacteria: live in extreme conditions
Eubacteria: found in every environment on Earth (even in and on you!)
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Open Ended
Why can't bacteria cells be seen with the naked eye?
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Multiple Select
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Size
Bacteria cells are microscopic and cannot be seen with the naked eye.
-Their size ranges between 1-5
than eukaryotic cells (us!)
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Bacteria Come in 3 Basic Shapes...
Coccus (spherically shaped)
Bacillus (rod-shaped)
Spirilla (spiral-shaped)
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Bacterial DNA
Contain one or two coiled/circular chromosomal DNA
Many also contain plasmids: specialized DNA that can replicate independently from chromosomal DNA
Plasmids occur in greater numbers
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Other Bacteria Cell Structures
Cell is filled with cytoplasm
Protected by cell membrane and cell wall
Many also have a capsule and appendages to assist in movement and attaching to surfaces
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Multiple Choice
12
Multiple Select
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Open Ended
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Obtaining Energy
Bacteria cells live in a wide range of environments, and therefore must be adaptable. Because of this, bacteria obtain food energy in various ways.
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Heterotrophs vs Autotrophs
Heterotrophs: must consume organic material (food) in order to obtain energy (like us!)
Autotrophs: Obtains energy by producing their own organic material by converting CO2 into carbohydrates!
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Heterotrophic Bacteria
Consume food molecules by feeding on organic waste
Consume food molecules by feeding off of a living host
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Autotrophic Bacteria
Photosynthetic Bacteria: convert light into food energy
Chemosynthetic Bacteria: convert chemicals from surrounding environment into food energy
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Multiple Choice
19
Fill in the Blanks
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Fill in the Blanks
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Bacterial Reproduction
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Asexual Reproduction
one parent organism
offspring are genetically identical to parent organism
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Binary Fission
Forms two genetically identical cells
Can occur RAPIDLY under ideal conditions (food, oxygen, warm temperatures, moisture)
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Conjugation
Two bacteria attach to each other and combine genetic DNA
Increases genetic variation
NO NEW ORGANISM FORMED
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Endospores
Thick internal wall built around bacteria's chromosome
Occurs when environmental conditions are unfavorable
Allows bacteria to remain dormant for extended period of time
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Multiple Select
27
Multiple Choice
28
Open Ended
Bacteria Review
-Size, Shape, and Structure
-Obtaining Energy
-Reproduction
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