1. If a plant absorbed all incoming Iight, what would it look like? The plant uw
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1. If a plant absorbed all incoming Iight, what would it look like? The plant uwoutd be bloox ldaex , o eignt reptected. 2. In the past, the Calvin Cycle was called the dark reaction. people incorrectly assumed that it happened only in the dark. It is true that the Calvin Cycle can continue for a few minutes after a plant is put into complete darkness, but then the Calvin Cycle stops. Consider what you leamed in this lab about cellular supplies of NAD INADH and FAD/FADH2 and consult Figure 10.19 and 10.6 to explain why the Calvin Cycle can continue in darkness, and why it cannot continue for very long. This name was dropped partly because I4 is a light-inde peudent proceps. Covin Cuce io Wne oynthesis poxt ight reox, directly uses light. The Calvin cgcle is ueled meeo ligint. There esS Colled, don. Only the oducts Rrow the light reax out dcesit meed ligt 3. Some of the pigments in the plant chromatography experiment show a strong preference for a non- eox polar environment. Where in the chloroplast do you think you would find them? We use glucose for our fermentation experiment. a. Do you think that yeast can ferment starch (hint-what enzyme that we have learned about in lab 4. b. c. would they need to do this)? Do you think yeast can ferment pyruvate? Can yeast ferment glyceraldehyde 3-phosphate? Figure 9.9 will probably help hereExplanation / Answer
Ans 4) a - yeast cant directly ferment starch firstly starch has to be broken down into simple sugars, to make the yeasts react with these sugars during the process of fermentation.as yeast cant directly digest starch so broken inyo glucose . Starch can be broken down by mechanically , gelatinising etc.
b) yes pyruvate can be fermented by yeasts, the pyruvate ia decarboxylated to form acetaldehyde. In this process the hydrogen is released from NADH through which acetaldehyde is converted to ethanol.
c) Fermentation of glyceraldehyde 3 phosphate ia nt possible because for fermentation NAD+ is used, wgich is used for conversion into ethanol , but NAD+ has to be used by glyceraldehyde 3 phosphate for the further steps or process of glycolysis .
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