practicals

Question 1

why may a scatter graph not be an appropriate graph to use

Answer 1

as there is only one dependent variable

Question 2

why would a buffer solution be used

Answer 2

to keep the pH constant

Question 3

why does ground liver catalise reactions at a greater rate

Answer 3

as grinding it increases the surface area of the liver and releases more catalase

Question 4

what are three factors controlled in an enzyme reaction

Answer 4

enzyme concentration
substrate concentration
pH

Question 5

in a root tip squash why do you not push down side ways on the cover slip

Answer 5

as pushing hard spreads the tissue

but pushing hard sideways breaks chromosomes

Question 6

why is a root tip used in a root tip squash

Answer 6

as it’s where mitosis occurs

Question 7

why is a stain used when observing cells under a microscope in a root tip squash

Answer 7

to allow the chromosomes to be visible

Question 8

why is a root tip firmly squashed in a root tip squash

Answer 8

to allow light through

Question 9

how do you calculate rate

Answer 9

1/mean time

Question 10

how is a control set up in a reaction measuring enzyme activity

Answer 10

replace enzyme solution with distilled water or boiled enzyme solution