Biology SL
Biology SL
4
Chapters
553
Notes
Theme A - Unity & Diversity
Theme A - Unity & Diversity
Theme B - Form & Function
Theme B - Form & Function
Theme C - Interaction &  Interdependence
Theme C - Interaction & Interdependence
Theme D - Continuity & Change
Theme D - Continuity & Change
IB Resources
Theme C - Interaction &  Interdependence
Biology SL
Biology SL

Theme C - Interaction & Interdependence

Unlock Yeast's Brewing & Baking Secrets!

Word Count Emoji
451 words
Reading Time Emoji
3 mins read
Updated at Emoji
Last edited on 15th Oct 2024

Table of content

What is anaerobic cell respiration?

It's the process by which cells produce energy without using oxygen. Instead of oxygen, other molecules play a role in generating energy.

What’s up with yeast?

  • Yeast is a one-celled fungus. It's like that friend who's up for anything - a 'facultative anaerobe'. This means yeast can work with or without oxygen. Cool, right?
  • Fun fact: Yeast is naturally found chilling on the surfaces of fruits.

Anaerobic respiration in yeast

  • Instead of producing lactate like our muscles do without oxygen, yeast makes ethanol and carbon dioxide.
  • Process
    • Carbon dioxide is removed from pyruvate to form ethanal.
    • Hydrogens are added to ethanal to form ethanol.

Yeast in baking 🍞

  • Making bread? You’ll often find yeast in the mix.
  • Role of yeast in bread-making
    • Initially, yeast breathes with oxygen present in the dough.
    • Once the oxygen's gone, it's anaerobic party time.
    • The CO₂ produced can't escape the sticky dough, so it creates bubbles making the dough rise!
    • Ethanol? It's there but disappears when baking because it evaporates.

Real-world example: Ever made a pizza? That fluffy crust is thanks to the bubbles formed by yeast fermentation!

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IB Resources
Theme C - Interaction &  Interdependence
Biology SL
Biology SL

Theme C - Interaction & Interdependence

Unlock Yeast's Brewing & Baking Secrets!

Word Count Emoji
451 words
Reading Time Emoji
3 mins read
Updated at Emoji
Last edited on 15th Oct 2024

Table of content

What is anaerobic cell respiration?

It's the process by which cells produce energy without using oxygen. Instead of oxygen, other molecules play a role in generating energy.

What’s up with yeast?

  • Yeast is a one-celled fungus. It's like that friend who's up for anything - a 'facultative anaerobe'. This means yeast can work with or without oxygen. Cool, right?
  • Fun fact: Yeast is naturally found chilling on the surfaces of fruits.

Anaerobic respiration in yeast

  • Instead of producing lactate like our muscles do without oxygen, yeast makes ethanol and carbon dioxide.
  • Process
    • Carbon dioxide is removed from pyruvate to form ethanal.
    • Hydrogens are added to ethanal to form ethanol.

Yeast in baking 🍞

  • Making bread? You’ll often find yeast in the mix.
  • Role of yeast in bread-making
    • Initially, yeast breathes with oxygen present in the dough.
    • Once the oxygen's gone, it's anaerobic party time.
    • The CO₂ produced can't escape the sticky dough, so it creates bubbles making the dough rise!
    • Ethanol? It's there but disappears when baking because it evaporates.

Real-world example: Ever made a pizza? That fluffy crust is thanks to the bubbles formed by yeast fermentation!

Unlock the Full Content! File Is Locked Emoji

Dive deeper and gain exclusive access to premium files of Biology SL. Subscribe now and get closer to that 45 🌟