IB Biology Practical Investigations/Cells/Population growth of
yeast cells Background information for teachers  (This practical
is placed here more as a bookmark than as a real example of
work. I am still testing out this wiki idea. Steve). This simple
practical is good in the early stages of the DP Bio course as an
introduction to the IA methods and write-up procedure. Students
are given a culture of yeast cells in sugar and water, a
microscope and a haemocytometer. The method is given to them, so
it is not suitable for Planning (a) or Planning (b). AIM: To
produce a population growth curve of yeast cells in liquid
nutrient medium. MATERIALS AND EQUIPMENT: - Activated yeast
culture - Microscope and haemocytometer - Dropping pipettes,
distilled water, 1 x 100ml beaker. METHOD IN BRIEF: - Instruct
students in use of the haemocytometer and calculations required.
- Cell counts are made on a daily basis for 1 week, and recorded
on a population growth curve.  Teachers' Reflections Having
tried this practical a num