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 @Briggs Symposium

1. Which of the following statements is a correct distinction between autotrophs and heterotrophs?

A. Only heterotrophs require chemical compounds from the environment

B. Cellular respiration is unique to heterotrophsC. Only heterotrophs have mitochondriaD. Autotrophs, but not heterotrophs, can nourish

themselves beginning with CO2E. Only heterotrophs require oxygen

Are you reading, notes, studying? Test your participation

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

A. light energyB. CO2 and ATPC. H2O and NADPHD. ATP and NADPHE. sugar and O2

Short Experiment:

Growing radishes from seed

Biology Radish ProblemWeighed 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.

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

A. no change – increase – no changeB. increase – increase – increaseC. increase – decrease – no changeD. decrease – increase – decreaseE. None of the above are correct

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).

When Light Is Absorbed, Electrons Enter an Excited State

Time to capture photons (photosystem football)

How is Oxygen generated in Photosynthesis?

How is Oxygen generated in Photosynthesis?A.CO2 is split into carbon and oxygenB.H2O is split into hydrogen and oxygenC.Light beams oxidize water making O2D.None of the above

ATP powers everything

Peter Mitchell: Diffusion is the answer!

Paul Boyer: I think it actually twists!

Masasuke Yoshida “Ummm… check this out.”

Masasuke Yoshida “Ummm… check this out.”

Masasuke Yoshida “Ummm… check this out.”