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iGCSE Biology MICROORGANISMS - Coggle Diagram
iGCSE Biology
MICROORGANISMS
only seen with a microscope
fermentation
metabolic process
carried out by
microorganism
biotechnology
using microbes to make
products useful to humans
Bread
when air runs out, yeast cells deprived
of oxygen & respire anaerobically
glucose -> ethanol + carbon dioxide
yeast species Saccharomyces cerevisae
starts respiring aerobically
producing water + carbon dioxide
carbon dioxide -> bread rises
baking expands CO2 bubbles, kills yeast cells
and burns off alcohol
Wine
yeast ferments sugars
in grape juice
alcohol increases
alcohol eventually
kills yeast cells
Beer
barley - contains starch
barley seeds germinate
produce amylase
amylase breaks down starch
into sugar maltose
maltose fermented
by yeast
Yoghurt