{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Test 1 review - Microbiology Test1Review CHAPTER1 Terms...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Microbiology Test 1 Review CHAPTER 1 Terms: Scientists: Bassi : Showed that a disease affecting silk production in silkworms was caused by a fungal infection Cohn : Demonstrates the existence of a heat‐resistant form of germs (endospores) Hess : suggested to Koch to use agar in place of gelatin Koch : Germ theory of disease. Developed solid microbiological medias for obtaining isolated & pure cultures of bacteria. Lister : founded aseptic technique, heat sterilized instruments to avoid infection Pasteur: swan‐neck flask experiment, spontaneous generation was solidly disproved Redi: Disproved spontaneous generation of maggots from rotting meat using 3 experimental containers Spallazani : Sealed glass flasks and boiled contents. Concludes air either carries germs into the broth or air is required for the growth of the germs Schwann : Concludes air carries germs with open flask experiment Shroder : Flasks with boiled broths are stoppered with sterilized cotton/wool. Ait therefore carries germs that can be stopped. Tyndall : Hypothesizes that some forms of germs may be more resistant to heat after everyone tried to repeat Pasteurs experiment Van Leeuwenhoek : haberdasher that constructed first microscope. Discovered “animalcules” 1. Kingdoms vs. Domains 5 kingdoms: o Animalia‐ duh o Plantae‐ duh o Fungi‐ unicellular and multi, take nutrients from enviornment o Protista‐ generally large, unicellular (algae, protozoa, slime/water molds) o Monera‐ all prokaryotes 3 domains: o Eukarya‐ include protist, fungi, and plants/animals o Bacteria‐ usually single celled, mostly prokaryotic o Archaea‐ rRNA sequences, lack peptidoglycan, unique lipid membranes
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Viruses are not included because they are acellular 2. rRNA model Why rRNA a suitable marker? rRNA is universally present in all living organisms RNA is capable of storing, copying, and expressing genetic information Comparing rRNA: sequences of nucleotides in the genes in rRNA are compared between 2 organisms. The amount of difference in sequence tell how evolutionary related the organism are. Doesn’t tell time relation though 3. Endosymbiotic theory Theory holds that mitochondria, chloroplasts and hydrogenosomes were their own bacteria that incorporated themselves into another and became internal structures Evidence: o They have their own DNA and ribosomes (both are similar to bacterial DNA and ribosomes). o Bacterium Rickettsia prowazekii genome is more similar to modern mitochondrial genome than bacterium genome. o Cholorplasts of green algae have high homology similarity with cyanobacteria genus Prochloron which lives within marine invertebrates 4. Spontaneous Generation Leeuwenhoeks communications on microorganisms renewed controversy. Some proposed that microorganisms arose form spontaneous generation even though larger organisms did not.
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}