The HW assignment was:
Actively Read 208-209, be able to answer the questions next to Figures 8-6,8-7,8-8
Answer questions on p. 217: #16, 18, 19
The key words to take down from the reading:
thylakoids - a single "disc" made of a membrane. It is the location of the light reactions of photosynthesis.
stroma - the liquid space surrounding the grana
photosystems - clusters of proteins and pigments that are the light collecting units of the chloroplast
What are thylakoids? - They are flattened membranes that are the site of the light reactions of photosynthesis.
What are the products of the light-dependent reactions? - From the diagram in Figure 8-7, the light reactions produce ATP, NADPH, and O2.
What eventually happens to the electrons in NADPH? - The energy of the electrons goes to help build molecules in the dark reactions of photosynthesis.
16. Write the basic equation for photosynthesis using the names of the starting and final substances of the process.
Six carbon dioxide molecules combine with six water molecules using light energy, and form one glucose molecule and six oxygen molecules.
18. Identify the structures labeled A, B, C, and D. In which structure(s) do the light-dependent reactions occur? In which structure(s) does the Calvin cycle take place?
A - outer membrane
B - stroma
C - grana (or more than one granum)
D - thylakoid
light reactions occur in the thylakoid, Calvin cycle (dark reaction) occurs in the stroma.
19. NADP+ is a molecule that carries high energy electrons during the light reaction of photosynthesis. It accepts electrons that have been excited and released from chlorophyll molecules that have absorbed light energy, along with H+ ions, to form NADPH.
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