Yeast is Beast!

What is Yeast? Yeast are single-celled fungi A living organism Related to the other fungi including: – edible mushrooms – common baker's yeast used to leaven bread – molds that ripen blue cheese; molds that produce antibiotics

Is yeast an autotroph or a heterotroph? Make a prediction in your notebook!

Tiny Organism- Long Name The scientific name is Saccharomyces cerevisiae It means "sugar-eating fungus".

Is yeast an autotroph or a heterotroph? The scientific name tells you!

Heterotroph Tell why.

How does yeast use energy ? Yeast cells digest food to obtain energy for growth (heterotroph) Their favorite food is sugar – sucrose (beet or cane sugar), – fructose and glucose (found in honey, molasses, maple syrup and fruit) – maltose (derived from starch in flour).

Aerobic Respiration C 6 H 12 O O 2 → 6 CO H 2 O + heat Occurs in the presence of Oxygen How does this connect to the Carbon Cycle?

Anaerobic Respiration Occurs without Oxygen Fermentation is anaerobic respiration Yeast goes through fermentation

Alcoholic Fermentation produces useful end products, pyruvic acid, carbon dioxide (gas) and ethyl alcohol These end products are released by the yeast cells yeast ferments the sugars available from the flour and/or from added sugar

Design an Experiment How is anaerobic respiration affected by variables? How does carbon cycle through organic matter (yeast)? How is the carbon cycle in yeast affected by variables? What tools do you need?