A Level Biology Eduqas Practicals

?
  • Created by: Ruhab21
  • Created on: 24-09-20 23:25
State what Standard Deviation is?
Shows Spread of Data around a Mean. Larger the S.D = less reliable and greater spread
1 of 12
State what Student T test is?
Compare the means of two samples and see if there is a significant difference between them.
2 of 12
State what is Chi Squared?
is used to compare data from distinct categories. It tells us if there is a significant difference between the observed and expected values
3 of 12
In Respiration , State what Artifical Hydrogen Acceptor is used in respiration experiments?
Methylene Blue
4 of 12
In Respiration, What colour is Methylene Blue when oxidised?
Blue
5 of 12
In Respiration, What colour is Methylene Blue when reduced?
Colourless
6 of 12
In Respiration, Describe what Methylene Blue will do in respiration experiment?
During respiration, methylene blue will accept hydrogen atoms from dehydrogenase enzyme 2) Therefore, the faster methylene blue decolourises the greater the rate of dehydrogenation and therefore respiration.
7 of 12
In Photosynthesis, Describe how you would undertake an investigation into stomatal numbers in a leaf?
1) Use Nail Varnish to see Lower Epidermis 2) Observe this under a microscope using an eye piece graticule 3) Count the number of stomata in a given area 4 Using this to calculate the numbers of stomata on the lower epider
8 of 12
In Photosynthesis, Describe how you would separate photosynthetic pigments using chromatography:?
1) Add Pigment to TLC paper 2) Add Solvent below the pencil baseline 3) Pigments travel across paper in different distances according to size 4) Identify with Rf Values
9 of 12
In Microbiology, Describe how the gram stain can be used to distinguish between bacteria:
Gram –ive don’t retain crystal violet due to their lipopolysaccharide and thin peptidoglycan cell wall but they do retain the red counter stain (Safranin)
10 of 12
In Microbiology , Describe how you would undertake a serial dilution?
1) Add 1cm3 of bacterial culture to a test tube containing 9cm3 of distilled water 2) Mix this up and then transfer 1cm3 of this into another test tube containing 9cm3 distilled water 3) Repeat till correct dilution factor reached
11 of 12
In Microbiology, How could these dilutions be used to work out the number of bacteria in the original sample?
1) Place 1cm3 of each dilution onto an agar plate using a sterile spreader (x3 to calculate a mean) 2) Incubate for a day 3)Count number of colonies and * by dilution factor to work out OG sample 4) 1 colony = 1 bacterial sample
12 of 12

Other cards in this set

Card 2

Front

State what Student T test is?

Back

Compare the means of two samples and see if there is a significant difference between them.

Card 3

Front

State what is Chi Squared?

Back

Preview of the front of card 3

Card 4

Front

In Respiration , State what Artifical Hydrogen Acceptor is used in respiration experiments?

Back

Preview of the front of card 4

Card 5

Front

In Respiration, What colour is Methylene Blue when oxidised?

Back

Preview of the front of card 5
View more cards

Comments

No comments have yet been made

Similar Biology resources:

See all Biology resources »See all Practical applications of biology resources »