Practicum 1 Flashcards
Cocci bacteria (spherical prokaryotes) Colorized SEM of Staphylococcus aureus. These bacteria cause skin and wound infections, food poisoning, and toxic shock syndrome.
coccus (pl., cocci)
A bacterium with a spherical shape. Compare with bacillus, spirillum, vibrio, and spirochete.
bacillus (pl., bacilli)
A rod-shaped bacterium. Compare with coccus, spirillum, vibrio, and spirochete.
spirochete
A long, flexible, helical bacterium. Compare with spirillum, vibrio, bacillus, and coccus.
spirillum (pl., spirilla)
A long, rigid, helical bacterium. Compare with spirochete, vibrio, bacillus, and coccus.
vibrio.
A spirillum (spiral-shaped bacterium) that is shaped like a comma. Compare with spirillum, spirochete, bacillus, and coccus.
Capsule or slime layer
(1) The portion of the moss sporophyte that contains spores. (2) A simple, dry, dehiscent fruit that develops from two or more fused carpels and opens along many sutures or pores to release seeds. (3) A gelatinous coat that surrounds some bacteria.
Pili (sing., pilus)
Hairlike structures on the surface of many bacteria; function in conjugation or attachment.
fimbriae (sing., fi mbria).
Hairlike structures that project from the cell surface of some prokaryotes; help bacteria to adhere to one another and to attach to the surfaces of cells they infect.
Plasmids
Small, circular, double-stranded DNA molecule that carries genes separate from those in the main DNA of a cell.
Binary fission
Equal division of a prokaryotic cell into two; a type of asexual reproduction.
Budding
Asexual reproduction in which a small part of the parent’s body separates from the rest and develops into a new individual; characteristic of yeasts and certain other organisms.
Conjugation
(1) A sexual process in ciliate protists that involves exchange of haploid nuclei with another cell. (2) A mechanism for DNA exchange in bacteria that involves cellto-cell contact.
Sex pili
long, hairlike extensions that project from the cell surface.
Autotrophs
An organism that synthesizes complex organic compounds from simple inorganic raw materials; also called producer or primary producer. Compare with heterotroph. See chemoautotroph and photoautotroph.
Heterotrophs
An organism that cannot synthesize its own food from inorganic raw materials and therefore must obtain energy and body-building materials from other organisms. Also called consumer. Compare with autotroph. See chemoheterotroph and photoheterotroph.
Chemotrophs
Organism that uses organic compounds or inorganic substances, such as iron, nitrate, ammonia, or sulfur, as sources of energy. Compare with phototroph. See chemoautotroph and chemoheterotroph.
Phototrophs
Organism that uses light as a source of energy. Compare with chemotroph. See photoautotroph and photoheterotroph.
Photoautotrophs
An organism that obtains energy from light and synthesizes organic compounds from inorganic raw materials; includes plants, algae, and some bacteria. Compare with photoheterotroph, chemoautotroph, and chemoheterotroph.
Chemoautotrophs
Organism that obtains energy from inorganic compounds and synthesizes organic compounds from inorganic raw materials; includes some bacteria and many archaea. Compare with photoautotroph, photoheterotroph, and chemoheterotroph.
Photoheterotrophs
An organism that can carry out photosynthesis to obtain energy but cannot fix carbon dioxide and therefore requires organic compounds as a carbon source; includes some bacteria and archaea. Compare with photoautotroph, chemoautotroph, and chemoheterotroph.
Chemoheterotrophs
Organism that uses organic compounds as a source of energy and carbon; includes animals, fungi, many bacteria, and a few archaea. Compare with photoautotroph, photoheterotroph, and chemoautotroph.
Decomposers
Microbial heterotrophs that break down dead organic material and use the decomposition products as a source of energy. Also called saprotrophs or saprobes.
Aerobic
Growing or metabolizing only in the presence of molecular oxygen. Compare with anaerobic.
facultative anaerobes
An organism capable of carrying out aerobic respiration but able to switch to fermentation when oxygen is unavailable, e.g., yeast. Compare with obligate anaerobe.
Obligate anaerobes
Bacteria that carry out anaerobic respiration; they respire with terminal electron acceptors other than oxygen. (sulfate, nitrate, or iron)
Nitrogen fixation
The conversion of atmospheric nitrogen (N2) to ammonia (NH3) by certain bacteria; part of the nitrogen cycle.
Crenarchaeota
Consists mainly of extreme thermophiles, archaea that are require a very high temperature or very low temperature for growth.
Euryarchaeota
Include many archaea that exhibit extreme environments.
Methanogens
a large, diverse group that inhabit oxygen-free environments in sewage, swamps, and the digestive tracts of humans and other animals. They are obligate anaerobes that produce methane gas from simple carbon compounds.
Extreme halophiles
heterotrophs that require large amounts of Na+ for their growth. They live in saturated brine solutions such as salt ponds, the Dead Sea, and Great Salt Lake.
Nanoarchaeum
a very small (400 nm) anaerobic, extreme thermophile that is now classifi ed as a euryarchaeote.
Rickettsias
very small, rod-shaped bacteria.
enterobacteria
decomposers that live on decaying plant matter, pathogens, and a variety of bacteria that inhabit humans.
Vibrios
Vibrios are mainly marine; some are bioluminescent. Vibrio cholerae causes cholera.
Pseudomonads
heterotrophs that produce nonphotosynthetic pigments; cause disease in plants and animals, including humans.
Purple sulfur bacteria
Purple sulfur bacteria are photoautotrophs that do not produce oxygen
myxobacteria
*(slime bacteria), which secrete slime and glide or creep along.
Cyanobacteria
Prokaryotic photosynthetic microorganisms that possess chlorophyll and produce oxygen during photosynthesis.
Actinomycetes
Superficially resemble fungi. Contain peptidoglycan in their cell walls, lack nuclear envelopes, have other prokaryotic characteristics.
Lactic acid bacteria
ferment sugar, producing lactic acid as the main end product. Inhabit decomposing plant material, milk, and other dairy products; responsible for the characteristic taste of yogurt, pickles, sauerkraut, and green olives. Among the normal inhabitants of the human mouth and vagina.
Mycobacteria
slender, irregular rods; contain a waxy substance in their cell walls. One species causes tuberculosis; another causes leprosy.
Streptococci
inhabit the mouth and digestive tract of humans and some other animals. Among the harmful species are those that cause “strep throat,” dental caries, a form of pneumonia, scarlet fever, and rheumatic fever (see chapter opener).
Clostridia
anaerobic. One species causes tetanus; another causes gas gangrene. Clostridium botulinum can cause botulism, an often fatal type of food poisoning
mycoplasmas
are a group of very small bacteria that lack cell walls. They may have evolved from bacteria with gram-positive cell walls. They inhabit soil and sewage; some are parasitic on plants or animals. Some inhabit human mucous membranes but do not generally cause disease; one species causes a mild type of bacterial pneumonia in humans.
Chlamydias
lack peptidoglycan in their cell walls. They are energy parasites, completely dependent on their hosts for ATP. Infect almost every species of bird and mammal. A strain of Chlamydia causes trachoma, the leading cause of blindness in the world. Sexually transmitted chlamydias are the major cause of pelvic infl ammatory disease (PID) in women.
symbiosis.
An intimate relationship between two or more organisms of different species. See commensalism, mutualism, and parasitism.
symbionts
The partners in a symbiotic relationship are called symbionts.
parasite
A heterotrophic organism that obtains nourishment from the living tissue of another organism (the host).
Biofilms
An irregular layer of microorganisms embedded in the slime they secrete and concentrated at a solid or liquid surface.
bioremediation
A method to clean up a hazardous waste site that uses microorganisms to break down toxic pollutants, or plants to selectively accumulate toxins.
microbiota
(also referred to as microflora)—harmless symbiotic prokaryotes.
Exotoxins
A poisonous substance released by certain bacteria. Compare with endotoxin.
Endotoxins
A poisonous substance in the cell walls of gram-negative bacteria. Compare with exotoxin.
vancomycin-resistant Staphylococcus aureus, or VRSA
Methicillin-resistant Staphylococcus aureus (SA), referred to as MRSA, and vancomycin-resistant Staphylococcus aureus, or VRSA, have been directly linked to the horizontal transfer of antibiotic resistance genes by plasmids during conjugation
Methicillin-resistant Staphylococcus aureus (SA), referred to as MRSA,
Methicillin-resistant Staphylococcus aureus (SA), referred to as MRSA, and vancomycin-resistant Staphylococcus aureus, or VRSA, have been directly linked to the horizontal transfer of antibiotic resistance genes by plasmids during conjugation.
Spirochetes
spiral-shaped bacteria with fl exible cell walls; move by means of unique internal fl agella called axial fi laments. Some species are free-living, whereas others form symbiotic associations; a few are parasitic. The spirochete of greatest medical importance is Treponema pallidum, which causes syphilis.
Spirochete baceria. Colorized SEM of Borrelia burgdorferi. These spirochetes cause Lyme disease, transmitted by infected ticks.
Bacilli bacteria Colorized SEM of Salmonella. These bacilli cause food poisoning.
Prokaryote
mixed bacteria
look for 3 morphologies.
mycelium
coccusclusters
mixed archaea
What is the grouping of the cell?
Prokarote
bacteria
Gram positive
Staphylococcus
S. Aureus
Coccus shape
normally live in the nose & on the skin. opportunistic pathogens that cause disease when the immunity of the host is low.
may cause toxic shock syndrome, food poisoning, causes boils and skn infections
What is the grouping of the cells?
Prokaryote
bacteria
Gram positive
Streptococcus
Coccus clusters
Strepto=round chain connection
coccus= shape round
inhabit the mouth & digestive tract of hulmans/animals. some may cause strep throat, dental caries, scarlet fever, form of pneumonia, rheumatic fever
Prokaryote
ProteobacteriA
gram negative
Gamma Proteobacteria
E. coli
Colonies on blood agar
Prokaryote
Bacteria
Cyanobacteria
gram-negative
Anabaena
a filamentous cyanobacterium that fixes nitrogen
Prokaryotes
Bacteria
Cyanobacteria (gram negative)
Oscillatoria (fillaments)
Prokaryote
Bacteria
Cyanobacteria
gram negative
Gloeocapsa
prokaryote
bacteria
Cyanobacteria
gram negative
Spirulina
protein supplement found in food
prokaryote
bacteria
Cyanobacteria
- gram negative*
- Microystis*
can make toxins that contaminate water supplies.
prokaryote
Bacteria
Cyanobacteria
gram negative
Nitrogen fixing bacteria
Legume nodule cross section
swollen plant cells with pink or gray stained bacteria inside. those are the mutualistic, endosymbiotic, nitrogen-fixing bacteria(genus Rhizobium)
- What structure does there name refer to?
- why is this group worthwhile learning about?
- what cell structure does this name refer to?
- what makes this group special versus most other eukaryotes?
- How do they move?
- How do they get their nutrition?
- Why do they seem to watch you?
- what can they do to u and how do you get it?
Eukaryote
Protists
Supergroup:
- Excavata= deep or excavated oral groove (4 feeding)
- P: Diplomonada= diplomonads, refers to the 2 nuclei
* Giardia*
parasitic diplomonad
- may have possesed mitochondria los/reduced threw time
- unlike other protists excavates have atypical mitochondria.
- 8 flagella used for swimming
- eat food going threw the digestive systems
- their 2 nuclei look like eyes
- this organism is a pathogen giardia intestinaalis major cause of water borne diarrhea.
- what structure does this name refer to?
- what can you get from them and how do u get it?
- what ecological role does it play?
- what does “trich” mean?
Eukaryote
Protists
Supergroup: 1.Excavata= deep or excavated oral groove (4 feeding)
- P:Parabasalidsa=parabasalids refers to specialized organelle that is intimately associated w/ basal bodies in the phylum.
- trichonympha
- lives on the guts of wood eating temites and cockroaches (mutualistic relationship).
Have 100s of flagella. 4. hair
pathogen
- Trichomonas (no lab ex) trichomonas vaginalis causes trichomoniasis curable sexual transmitted disease
- what structure does this name refer to?
- what flagella structure is also unusual?
- How do they get their nutrition?
- what process did some of these use to become green?
- what method of movement do they use?
eukaryotic Protsts
Excavates
subgroup of excavates= Discicristates
P: Euglenoids
- (1) Euglenids eg: Euglena, cell elongate, green in color*
2. characterizd by unusualflagellum; in addition to the 9+2 arrangement have a crystalline rod in their flagella, function unknown generlly have 2 flagella 1 long and 1 short doesn’textend outside cell.
3. Autotrophic,some photosynthetic euglenoids lose chlorophyll and obtain nutrients heterotrophically by ingesting organic matter. or phagocytosis
Asexual reproduction by longitudinal cell division starting from the front end of the cell
- photosynthesis
- pellicle is flexible and helps it changes shape easily eyespot may shield light detectr at at the base of flagellum helping it move to the light of appropriate intensity.
- what cell structure does the name refer to?
- How do they move?
- How do they get their nutrition?
- what disease are caused by them?
- Do all the members of this taxon cause disease?
eukaryotic, protists
Excavates
P: Euglenozoa
- Kinetoplastids (aka hemoflagellates) single large mitochondrion w/ its own organized DNA called kinetoplastids.
* eg: Trypanosoma* - Flagellum tail
- parasitic?
- african sleeping disease, chagas disease
- mostly all
Trypanosomas diagram
- why is this group worth while learning about?
- what cell structure does this name refer to?
- what cell structure does this name refer to and what is it used for?
- how do the members of this taxon get their nutriion?
- what cell structure is unique in this taxon?
Eukaryotic Protists
Supergroup: Chromalveolata
- (subgroup of Chromalveolata) Alveolates the alveoli, flattened vessicles located in the plasma membrane
- Phylum: Ciliata= ciliates the several 1000 cilia used 4 locomotion & some set up water currents that draw food toward them.
- up above and mouth oral groove food swept in.
- 2 kind of nuclei, diploid micronuclei & polyploid macronuclei, conjugation
* eg. Paramecium*
- How do they move (whats similar/different from the other ciliates you’ve seen?
Eukaryotic protists
Supergroup Chromalveolata
Alveolates (subgroup of Chromalveolata)
P: Ciliata
- eg. Vorticella*
1. move by flagella tail don’t have 1000s of cilicum as others usually do.
Chromalveolata
(subgroup of Chromalveolata)
P: Ciliata
Vorticella
- what do these names refer to?
- where do they live?
- How do they move?
- How do they get their nutrition?
- What is there economic importance to us?
- Why are they called “armored” dinoflagellates?
Eukaryotic Protists
Supergroup Chromalveolates
(subgroup of above) Alveolates
- P: Dinoflagellates= Pyrrophyta spinning flagellum, (fire, bioluminescence)
* Perdinium* - some symbiotically w. cnidarians (corals)
- flagella beat perpindicular to each other causing a spinnning motion like a motor.
- some photosynthetic, heterotrophic, & ingest other microorganisms for food.
- producers in marine ecosystem.