UNIT 5 - ANALYSIS Flashcards
why is chi squared used
- make comparisons between observed and expected data
- discontinuous data
null hypothesis
there is no significant difference between the MEAN observed and expected results
any difference is due to chance alone
what does p=0.05 mean
there is <5% probability that the difference between the means is due to chance
what is the risk of needles
may puncture the skin
what stain can be used to view plant cell chromosomes under light microscope
methylene blue
why must a specimen be flat to be viewed under the microscope
- to allow light to pass through the specimen
- to focus on the whole depth of the specimen at the same time
why do structures in (image 1) appear different to (image 2)
the have been cut (horizontally) instead of (vertically)
why may an electron microscope be used instead of light
size of structure may be below the level of resolution of the light microscope
electron microscope has a higher resolution
what occurs in the lag phase
organisms getting used to environment
- preparing to reproduce
what does yeast do in lag phase
dna replication
protein synthesis
atp synthesis
what happens in the log phase
exponential growth
(population doubles per unit time)
why does exponential growth happen in the log phase
no environmental resistance
what is environmental resistance
factors which prevents the population from growing exponentially
give examples of environmental resistance
biotic + abiotic factors
what happens at the stationary phase
popdensity = constant
population has reached carrying capacity
what is the carrying capacity
maximum number of individuals that the environment can sustain
what causes the death phase
- pathogens
- predator
- lack of food
what causes the death phase in yeast
accumulation of toxic waste (ethanol)
1 epu =
(stageunits/eyepieceunits) x given value of 1 stageunit
1mm =__μm
1000
1μm = __nm
1000
layers of duodenum from outside to inside
serosa
longitudinal muscle
circular muscle
submucosa
mucosa
endothelial cells (on the villi)
