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Bio - Diversity
Transcript of Bio - Diversity
19 min: "bacteria talk"
DNA or RNA
Protein coat - capsid
Envelope (membrane) - optional
helical spherical polyhedral
5 min: Amoeba Sisters
If you were the size of the state of California:
Viroid – SS RNA but no protein coat - causes plant diseases
Prion – protein but no genetic material – causes other proteins to fold incorrectly
Smaller than a virus!?
Contain genetic material
Are Viruses Alive?
No enzymes, ribosomes
No growth or development
Not made of cells
Must replicate in host cell
Therefore, viruses are NOT alive
T4 phages are Viruses that Attack the host E coli Bacteria
Virus recognizes specific receptor molecules on surface of host
Virus DNA injected into host cell
Virus DNA is replicated using host nucleotides & DNA polymerase
Host’s nucleotides, enzymes, ribosomes, aa’s, ATP, etc are used to make viral proteins
4. Transcription & Translation
Viral proteins & genome form 100’s of new viruses
5. Self Assembly
3 min enveloped RNA flu virus
Can be in groups
sticks to host
form hollow bridges to other bacteria
feed on organic materials
from dead or living organisms
Energy & Metabolism
some use light energy to make own organic molecules - PS
others use chemicals to make food - chemosynthesis
2. Some can be Autotrophs
Reproduction by Binary Fission
form hollow “bridges” using pili to connect to other bacteria
pass DNA across bridge
No mitosis or meiosis!
1. Some can be Heterotrophs
Decomposition – can help recycle or break down wastes, dead organisms, oil spills, etc.
Recycle C, N, S, & H in ecosystem
Important part of food chains (eaten by larger organisms)
Used to make human food: sauerkraut, yogurt, cheese
Produce vitamin K in our intestines; help us digest food
Cause disease in plants & animals
Water droplets to mouth, nose, eyes- TB
Insect vectors- Bubonic plague or Lyme
Cuts in skin
Contaminated food & water - Salmonella, cholera
Heat or Cold
Sanitation & Hygiene
Reproduction by binary fission
1. Similar to Bacteria
cell walls (no peptidoglycan)
membranes (really different lipids)
2. Different from Bacteria
a. Structurally different
Swamps, O2 free places, sewage treatment, stomachs of rumens (cows, deer, goats)
Hypertonic salt lakes
Hot & acidic:
deep ocean vents
b. Extreme Environments
“Millions compete in endless turf battle, competing for habitat”
They evolved chemical weapons to wipe out competitors…..
Chemicals made by fungus or bacteria and collected from them by humans
Or chemicals designed by humans
That kill or inhibit the growth of other microorganisms
What are they?
Stop bacterial growth in our bodies
Give to chickens, pigs, and cows to keep them healthy and growing
Antibacterial mixtures keep body & home surfaces clean
How do humans use them?
Some bacteria are not destroyed or harmed by antibiotics!
Bacteria on nutrient agar
1 colony survives
No competition, unlimited resources
Resistance gene passed on to offspring: all bacteria resistant!
Resistance genes can pass to other bacteria using plasmids (passed through pili bridges), viruses, or loose DNA in surroundings
Problem in hospitals & now common in athletic teams where skin infections passed easily
Can cause serious infection, toxic shock, & even death.
Another Serious Example: MRSA methicillin resistant Staphylococcus aureus
Don’t take one unless it’s needed (won’t work on viruses)!
Avoid infections – ie. clean & treat skin infections properly
Finish all medication so that all bacteria die and can’t pass on resistance
How can you thwart antibiotic resistance?
9.5 min TB resistance
uni or multicellular
no roots, stems or leaves
pigments in chloroplasts
cell walls - cellulose
no cell wall
move & feed with flagella, pseudopods, or cilia
What are they?
2.5 min Amoeba engulfs Paramecium
3.5 min slime molds
notochord becomes backbone
dorsal nerve cord becomes brain & spinal cord
post anal tail
3% of animals!
Ingest -use pseudopod to engulf food
Digest food inside cell
Euglenoids can also be heterotrophs!
unicellular or multicellular
no chitin in cell walls
some thread-like, others slug-like
All protists live in water, damp places, or inside other organisms
multicellular (yeast - unicellular)
made of hyphae- thin, threadlike filaments
mass of hyphae is mycelium
digest: - exoenyzmes sent out of hyphae to break down food
ingest: nutrients absorbed into hyphae
formed in reproductive structures
light weight, small
easily dispersed in air, water, or on animals
enormous #s produced
dormant until germination
internal skeleton including vertebrae
brain enclosed in a skull
pumping heart & efficient circ. system
1.5 min reproduction & spores
protist would be the size of
bacteria would be the size of
virus would be the size of
16 min chordates
2.5 min DNA virus replication
3 min overview
21 min magic doctor
what 2 processes happen to DNA?
cell walls made of chitin
5 min how microbes form communities
7 min but start at 4 min
4.5 min ted ed
evolution of resistance
4 min cell vs. virus ted ed
4 min water bears
8 min bacteria vs virus
kelp forest - multicellular plant-like protist