Maths In Biology Flashcards
Circumference of a circle
2pi x r
Area of a circle
Pi x r squared
Area of a cuboid
2 ( wxh + lxh + wxl)
Volume of a cuboid
W x h x l
What’s significant when doing Percentage increase?
Smaller number always on the bottom
Percentage change
New value- original value/ original value (or value comparing to) x 100
Magnification
Image size/ actual size
Rf value
Distance moved by solute/distance moved by solvent
Cardiac output
Stroke volume x hr
Respiratory quotient
CO2 produced/ O2 consumed
Microorganism population growth
N= N0 x 2^n
N= no. Of bacteria
N0= no. Of bacteria in starting colony
2^n= 2x no. Of generations
What does log10 10000=
=4
4 is the power
Rate=
Change in quantity/time
What does mlmin^-1 mean?
Ml per min
proportion of polymorphic gene loci=
number of polymorphic gene loci/ total number of loci
efficiency=
(biomass transferred/biomass intake) x 100
Ratio=
Surface area/ volume
percentage error=
(uncertainty/reading) x 100
Uncertainty=
margin of error/2
frequency density=
frequency/class width
1000m in km=
1km
1000µm in mm=
1mm
1m in dm=
10dm
1m in cm=
100cm
1m in mm=
1000mm
1nm in mm=
1,000,000
1nm in µm=
0.0001
mm >µm
x 1000
percentage change=
(difference/original) x 100
validity
the extent to which additional variables that could effect the dependent variable have been controlled
systematic error
an error that affects every experiment
random error
an error that doesn’t effect every experiment and is due to an unexpected or unique event
resolution
the smallest change that can be measured
uncertainty
interval in which the true value lies
repeatable
if the original experimenter repeats the investigation and obtains the same results
reproduceable
if a different experimenter repeats the investigation using the same methods and obtains the same results
total magnification=
eyepiece lens x objective lens
formula for bacterial growth
N=N0 x 2^n
N=number of bacteria currently in the population
N0= number of bacteria in the population at the beginning
^n= number of divisions
