Yeast are single-celled eukaryotic microorganisms. They reproduce asexually by budding. The new yeast cell (bud) grows out of the cell of an adult yeast cell following mitosis. The photograph shows some yeast cells. (Source: © Andre Nantel/Shutterstock) Yeast cells can be cultured and the rate of growth determined using a haemocytometer (counting chamber / Neubauer chamber). The growth curve for yeast grown in culture has four phases, similar to bacteria grown in culture. Sketch a growth curve on the axes drawn below. Label the axes and the four phases of the growth curve. (4) .......................................................... ..........................................................

Biology
IGCSE&ALevel
EDEXCEL
Exam No:wbi14-01-que-20240112 Year:2024 Question No:7(b)(ii)

Answer:

An answer that includes the following points:
- both axes labelled : log (living) \{(number)cells / yeast \(\}\) and time (1)
- units for x axis : hours (1)
- shape of curve drawn correctly (1)
- all four phases labelled correctly (1)

Knowledge points:

CH6 – Microbiology, Immunity and Forensics

Solution:

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