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Warm Up #3 4/17. Why do we study “CHNOPS”? Which macromolecule has the most energy (aka “long-term”) energy? Which type of macromolecules are enzymes? What do enzymes do? Which one of these is a macromolecule: nucleic acid or fatty acid?. Agenda 4/17. Photosynthesis Notes Practice

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warm up 3 4 17
Warm Up #3 4/17
  • Why do we study “CHNOPS”?
  • Which macromolecule has the most energy (aka “long-term”) energy?
  • Which type of macromolecules are enzymes?
  • What do enzymes do?
  • Which one of these is a macromolecule: nucleic acid or fatty acid?
agenda 4 17
Agenda 4/17
  • Photosynthesis Notes
  • Practice
  • Make sure to finish your assignment from yesterday
our big question for today
Our big question for today
  • How do organisms turn the sun’s energy into food energy?
  • Learning target #3

“I can explain how all living things get their energy from the sun”

making energy from the sun from light to life
Making energy from the sun: From light to life
  • Plants, algae, & bacteria use photosynthesis to turn light energy into chemical energy (food).

Autotrophs: Organisms that can make their own food (from sunlight, heat, or chemicals)Examples: plants, algae, some bacteria


Heterotrophs Organisms that consume other organisms to get food are called

  • Examples: humans, cows, grasshoppers, birds, fungi, amoebas

KEY CONCEPT: all organisms on earth depend on the sun’s energy to live (either directly or indirectly)


Photosynthesis: Process where organisms use water, carbon dioxide, and energy from the sun to make glucose

step 1 light reactions trapping converting the sun s light energy
Step 1: Light reactions (Trapping & converting the sun’s light energy)
  • A. Sunlight enters a plant’s leaf cell and goes into the chloroplast (plant cell organelle)

Inside the chloroplasts there are small compartments called thylakoids

(These compartments are surrounded by a liquid called stroma)


Chlorophylls only absorb certain light colors

Chlorophyll absorbs blue & red light the best, but reflect green light—so plants look green!

b with the help of an enzyme the light is used to split water molecules
B. With the help of an enzyme, the light is used to split water molecules
  • Enzymes control the speed of photosynthesis
  • Transpiration: loss of water in plants through their leaves
popcorn questions
Popcorn Questions
  • Look through your notes
  • Come up with 1 question
  • Call on somebody to answer your question
  • They get to call on somebody else
c splitting water releases electrons and oxygen
C. Splitting water releases electrons and oxygen.
  • The oxygen leaves the plant & goes into the air to get used by other organisms (remember: plants use oxygen too!)

ATP (adenosine triphosphate): compound used by cells to store energy

    • ATP’s bonds get broken down forming ADP and releasing energy
step 2 dark reactions converting co2 to glucose
Step 2: Dark Reactions (converting CO2 to glucose)

A. Carbon dioxide (CO2) enters the leaf through stomata

B. he carbon dioxide and hydrogens from water are turned into glucose using energy stored from the Light Reactions (Step 1)


photosynthesis equation
Photosynthesis Equation
  • REACTANT: The chemicals that get changed in a reaction (what gets used)
  • PRODUCT: The chemicals that get made in a reaction (what gets made)

Energyis stored in the bonds of glucose

**Energy stored in glucose can be used by the plant or and animal that eats it!**


What is the photosynthesis equation?

    • What does each part stand for?
  • Using the chemical energy stored in glucose
    • What is glucosestored as?
    • What do plants use the energy from this for?
  • Things that change the rate (speed) of photosynthesis
    • What are 3 things that can change the rate of photosynthesis and how do they work?
    • Ex: More light = ________ photosynthesis
return to our big question
Return to our big question
  • How do organisms turn the sun’s energy into food?
  • Write your own answer to this in your notes & get it initialed by the teacher