biology unit 1 notes: metabolism, energy & homeostasis
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Biology Unit 1 Notes: Metabolism, Energy & HomeostasisTRANSCRIPT
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Biology
Unit 1 Notes: Metabolism, Energy
& Homeostasis
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(1) Homeostasis
• Homeostasis:Maintaining internal stability / balance.
• When/Why does this happen?• Anytime there are changes inside your body, or directly around your body, away from
how it normally is.
• Helps keep you living and healthy, and keeps energy cycling through cells.
• Examples:• Shivering when cold
• Bicarbonate in blood to neutralize acid
• Increasing respiratory rate when blood oxygen is low
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(2) Energy Cycling & Transfer
• All living things need energy so that their cells can “do work” / stay alive.
• Organisms need to be able to:• Release potential energy from the bonds of molecules.
• Store extra energy in newly formed bonds of molecules (for later).
• Metabolism = The breaking down, and building of molecules inside cells in order to transfer energy and matter.
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(3) Important Metabolic Reactions
• There are 2 very common and important metabolic reactions cells use:• Hydrolysis
• Dehydration Synthesis
• These reactions are used to release or store energy as cells need to.
• Both reactions involve water.
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(4) Hydrolysis
• What does it mean?• Hydro = Water
• Lysis = Explode / Break Apart
• Hydrolysis = “To use water to break apart”.
• What is the purpose?• Release energy from molecules so that cells can use it.
• What happens?• Water is added to a larger polymer.
• The bonds holding the polymer together are broken.
• Energy is released.
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(5) Dehydration Synthesis
• What does it mean?• Dehydrate = Remove Water
• Synthesis = Put Together / Make
• Dehydration Synthesis = “To remove water to put together”.
• What is the purpose?• Store energy for later, in newly formed bonds/molecules.
• What happens?• Water is removed from individual monomers.
• New bonds are formed connecting the monomers together (to form a polymer).
• Energy is stored.
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(6) ATP & ADP
• ATP = Adenosine Triphosphate = “Energy Storing Molecule”
• ADP = Adenosine Diphosphate
• Your cells use ATP to store energy for later, and break apart ATP when they need energy to do work.
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ATP(“TRI-
phosphate)
ADP(“DI-
phosphate)
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(7) ATP & Metabolic Reactions
• Cells use Hydrolysis & Dehydration Synthesis with ATP.
• ATP ADP• Water is added to ATP.
• A phosphate is removed from ATP + the bond is broken.
• Energy is released + ADP is formed.
• ADP ATP• Water is removed from ADP.
• A phosphate is added to ADP + a new bond is formed.
• Energy is stored + ATP is formed.
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