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6 Kingdoms and Viruses
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Viruses = Small, nonliving microbes that can cause diseases in living
things
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Characteristics
• Nonliving - need host cell to reproduce, not a cell, doesn’t do metabolism
• Small
• Cause diseases in living organisms
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Structure
• Protein coat
• DNA or RNA
• Glycoproteins – help attach to host
• Arrangement of proteins give different shapes and binds to different host cells
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Types
• Bacteriophage
– attaches to bacteria cells
– studied because it has similar replication cycles as viruses that cause colds, measles, and AIDS
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Reproduction - Lytic Cycle
• Attachment
• Entry
• Replication
• Assembly
• Release
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Reproduction - Lysogenic Cycle
• Attachment
• Entry
• Integration
• Cell Multiplication
• Enters lytic cycle
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Bacteria = Single-celled organisms that do not have a nucleus and are
examples of prokaryotic cells
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Characteristics of Eubacteria and Archaebacteria
• Prokaryotic
• Unicellular
• Both autotroph and heterotroph
• Contains a cell wall
– Eubacteria – has peptidoglycan
– Archaebacteria – does not have peptidoglycan
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What are the two groups of bacteria?
• Archaebacteria – “Old” bacteria
– Live in harsh environments (hot springs, high salt concentrations, acidic, etc)
– anaerobic environments (no oxygen)
• Eubacteria – “True” bacteria
– Live Everywhere – air, rock, on surfaces
– aerobic environments (need oxygen)
– Contains DNA, ribosomes, cytoplasm, cell membrane, and cell wall
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How do bacteria reproduce?
• Asexual
– Binary Fission = creates two identical copies of the cell
• Sexual (pseudo)
– Conjugation – transfers DNA from one bacterium to another through a bridge that joins the two cells
• New genetically different cells
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Characteristics of Protists
• Eukaryotic
• Multicellular and unicellular
• Autotroph and Heterotroph
• Some have a Cell wall and some don’t
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Why are there so many different characteristics?
• Because there are so many different types of Protists.
• And they are divided into three categories. – they range in size can be from microscopic to a 35
meter (about105 feet) tall kelp.
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Not Necessarily a Kingdom
• Protists include phyla that have different ancestors (it’s the catch all “kingdom”)
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How are protists grouped or classified?
• 3 categories: Primarily by the way they obtain food.
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What are the three categories?
• First Category - Animal-like Protists
– Heterotrophs
• Second Category - Plant-like Protists
– Autotrophs
• Third Category - Fungus-like Protist
– Decomposers (heterotrophs)
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Ecology and Animal-like Protists
How are they important to the environment?
• Recycling nutrients by breaking down dead and decaying matter.
• Symbiotic Relationships – Trichonympha is a animal-like protist
that lives in
the gut of termites.
- Breaks down wood for the
termites.
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Characteristics of Kingdom Fungi
1. Eukaryotic
2. Heterotroph – Decomposers
- Absorb nutrients from surroundings
3. Unicellular (yeast) or multicellular (mold or mushroom)
4. Contains a cell wall made of chitin
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Reproduction
Asexual
1. spores
2. fragmentation – piece breaks off and new fungus grows
3. budding – mitosis (yeast)
Sexual
1. conjugation – different mating types join together
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Fungi Phyla
• Zygomycota – bread molds
• Basidiomycota – mushrooms
• Ascomycota – yeast, jock itch, ring worm
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Symbiotic Relationships
• Mycorrhizae –fungus and plant roots
– Helps absorb more nutrients for the plant
• Lichens –fungus and photosynthetic partner (cyanobacteria or green algae)
– Partner provides food; fungus provides moisture, shelter and a way to anchor to things
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Kingdom Plantae
• Nonvascular spore producers
• Vascular spore producers
• Vascular seed producers
–Gymnosperms
–Angiosperms
* Monots and Dicots
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Characteristics of Kingdom Plantae
• Eukaryotic
• Multicellular
• Autotroph, rarely heterotroph
• Has cell walls – made of cellulose
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Nonvascular – Spore producers
• 3 main phyla: mosses, liverworts, hornworts
• Vascular tissue: none
• Structure: short and no real root system (rhizoids), gets water through osmosis
• Environment: has to live near water or moist places
• Reproduction: Alternation of generations
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Vascular – Spore producers
• 4 main phyla: whisk ferns, club mosses, horsetails, and ferns
• Vascular tissue: Yes
– xylem: transports water and minerals
– phloem: transports sugar made from photosynthesis
• Structure: most are larger and taller than non-vascular plants
• Environment: can live in drier areas
• Reproduction: Alternation of generations
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Vascular – Seed producers (Gymnosperms)
• 4 main phyla: Cycads, Ginkgoes, Conifers, Gnetophytes
• Vascular tissue: xylem and phloem
• Structure: contain seeds found in cones
– Seeds = contain seed coat, embryo, and food source
• Reproduction – sexual
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Vascular – Seed producers (Angiosperms)
• 2 main phyla: Monocotyledons and Dicotyledons (Cotyledon = seed coat)
• Has fruit and flowers and is most complex type of plant
• Vascular tissue: xylem and phloem
• Structure: produces a fruit (ripened ovary) after pollen pollinates the egg
• Reproduction – sexual
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Kingdom Animalia
• Characteristics
– Eukaryotic
– Multicellular
– Heterotrophs
– No cell wall
– Lives on land and in water and most move around in some part of their life cycle
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Two Divisions
• Invertebrates – does not have a back bone
• Chordates – subphylum Vertebrates
– Contains a notochord = firm, flexible rod of tissue along back side of body
• Becomes the discs between the vertebrae
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Multicellular Organization and Reproduction
• Specialization – cells are adapted for specific functions and depend on other cells
• Cephalization – group of nervous tissue located in the front end of the organism
• Sexual – can reproduce asexually in same sex environments (Parthenogenesis)
– Zygote – first cell formed when gametes join together
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Characteristics Used to Group Animals
• Body symmetry
– Radial symmetry – many similar parts can be divided from the center
– Bilateral symmetry – 2 similar parts
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Characteristics Used to Group Animals
• Germ Layers– tissue types found in embryos
– Ectoderm – outside tissue that forms skin, hair, and nervous system
– Mesoderm – middle tissue that forms skeleton, muscles, cardiovascular system
– Endoderm – inside tissue that forms digestive system and respiratory system
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Characteristics Used to Group Animals
• Body Cavity
– Acoelomate – no body cavity
– Pseudocoelomate – gut supported in fluid, not connected by other tissue
– Coelomate – has tissue supporting the gut