Bacteria + Fungi Flashcards
Why can’t bacteria grow exponentially in the real world?
Limiting factors (nutrients, competition with other pathogens, oxygen, temperature, physical space)
GROWTH CURVE:
What is depicted by letter A ( start of the curve)?
Lag Phase!
GROWTH CURVE:
What is depicted by letter B (gradient increase on curve)?
LOG Phase - exponential logarithmic - growing as quickly as can!
GROWTH CURVE:
What is depicted by letter C? (Curve levelling off at the end!)
Stationery Phase - something becomes limiting
Which methods can be used to measure the numbers of viable bacteria in a culture?
Microscopy
Colony forming units (only works on bacteria you have to culture!)
Flow cytrometry
What is sloppy agar used for?
Determines Motility
Presence of flagella
Good for preservation
Which of the following statements concerning gram stain is INCORRECT?
Gram stain bacteria are ALL rod shaped!
In terms of characteristics, fungi are closer to plants than to animals.
True or false?
FALSE
Fungi are important to food webs because…
They are the KEY decomposers of organic matter!
Fungal cell walls characteristically contain…
Chitin
Fungal cell MEMBRANES characteristically contain…
Ergosterol
Which of the following are sexual fungal spores?
Zygospores!
Which region of the Hyphae is the ‘Absorption Zone’?
B - just behind the growing tip / near the Crystal!
Which region of the Hyphae is the ‘Storage Zone?’
C - where the lipid body and vacuoles are: where things get stored.
Lichens are Symbiotic associations between fungi and plants.
True or false…
FALSE
What activity in shown in diagram?
Thin blocks of cells with red and blue dots / nuclei inside
Plasmogamy - fusion of hyphae NOT nucleus
Which statement about yeast is correct…
Yeasts are MORE closely related to humans than bacteria!
Which fungal phyla are considered to be the OLDEST in terms of their evolution?
The Chytrids!
What 2 methods can be used for measuring the number of VIABLE bacteria?
Plate counts on agar
Measuring metabolic activity / respiration
What 2 features of gram NEGATIVE cell wall are NOT present in gram positive?
Endotoxin
Outer cell membrane
After gram staining, a bacterial ik tire appeared purple with ROUND cells clumped into clusters.
What 2 stater s are correct?
The bacterium is a gram positive coccus
The bacterium has retained the crystal violet gram stain!
What 2 laboratory tests are used to identify bacteria based on detecting the products of their respiratory pathways?
Catalase production
Oxidase production
What appendage allows bacteria to swim in a liquid?
Flagella
What feature allows bacteria to cross blood/brain barrier?
Capsule
