Announcements

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Announcements

• GATTACA Radish work due now.
• Reminders PHS notes provided (green pages)
  Learning Objectives provided in Course Packet
• Honors Option solo research 10 minute talk
  _at_Briggs Symposium

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1. Which of the following statements is a correct
distinction between autotrophs and heterotrophs?
Are you reading, notes, studying? Test your
participation

• Only heterotrophs require chemical compounds
  from the environment
• Cellular respiration is unique to heterotrophs
• Only heterotrophs have mitochondria
• Autotrophs, but not heterotrophs, can nourish
• themselves beginning with CO2
• E. Only heterotrophs require oxygen

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1. The light reactions of photosynthesis supply
the Calvin cycle with?

1. light energy
2. CO2 and ATP
3. H2O and NADPH
4. ATP and NADPH
5. sugar and O2

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Short Experiment Growing radishes from seed
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Biology Radish Problem

• Weighed out 3 batches of radish seeds (each 1.5
  g).
• Experimental treatments
• 1. Seeds not moistened (dry) placed in LIGHT
• 2. Seeds on moistened paper towels in LIGHT
• 3. Seeds on moistened paper towels in DARK
• After 1 week, all plant material was dried
  weighed.
• TASK Predict the (dried) biomass of the plant
  material in the various treatments.

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Predict the final (dried) bio-mass
increase/decrease/no change

• no change increase no change
• increase increase increase
• increase decrease no change
• decrease increase decrease
• None of the above are correct

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Results Weight of Radish Seedlings
1.46 g 1.63 g 1.20 g
How do you explain the results? (Remember all
treatments started as 1.5g).
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When Light Is Absorbed, Electrons Enter an
Excited State
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Time to capture photons (photosystem football)
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How is Oxygen generated in Photosynthesis?
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• How is Oxygen generated in Photosynthesis?
• CO2 is split into carbon and oxygen
• H2O is split into hydrogen and oxygen
• Light beams oxidize water making O2
• None of the above

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ATP powers everything
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Peter Mitchell Diffusion is the answer!
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Paul Boyer I think it actually twists!
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Masasuke Yoshida Ummm check this out.
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Masasuke Yoshida Ummm check this out.
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Masasuke Yoshida Ummm check this out.