Announcements

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Announcements

• Tomorrows recitation quiz NEJM 1
• iclickers mini-quiz academic honesty
• GATTACA ec Tonight 7pm C-106
• Order your primers oligos yet?
• Raise hand if you read pp185-189.
• Read because not just lecture here

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cytoplasm
outside cell
Based on the model of sucrose uptake shown, which
of the following treatments would increase the
rate of sucrose transport into the cell. a.
Decreasing extracellular sucrose
concentration. b. Decreasing extracellular pH c.
Decreasing cytoplasmic pH d. Adding an inhibitor
that blocks the creation of ATP. e. Adding a
substance that makes the membrane more permeable
to H
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Post- test
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Leaves contain millions of chloroplasts.
Cell
Chloroplasts
Chloroplasts are highly structured, membrane-rich
organelles.
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Where do plants get their food...
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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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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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Question for Thursday How is this image relevant
to Digestion, Cell Biology, Respiration and PHS?
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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.