I've been stuck on a few questions for a while now and can't seem to find the answers anywhere...I have tried my text book but it hasn't helped much.
The questions are as follows:
1. Why was a radioactive carbon source used for investigating light-independent reactions?
2. Why was the glass container for the suspension of algae flattened?
3. In an investigation using this apparatus (apparatus Calvin used to investigate the light independent reactions in photosynthesis) the amount of radioactive carbon was measured in four chemicals formed after five different periods of photosynthesis. The results are shown in the table:
Compound Time allowed for photosynthesis/seconds
5 15 60 180 600
A 0.7 2.3 6.0 10.2 7.5
B 1.3 2.2 3.4 3.5 3.5
C 0.08 0.17 0.25 1.2 1.2
D 0.02 0.03 0.9 0.19 1.8
a) Use the information in the table to place the compounds A to D in the order in which they are formed. Name the first two compounds in the Calvin Cycle.
b) Explain why the level of compount B remained steady in the later samples.
Sorry for the long winded post...any help would be greatly appreciated.
Thank you so much in advance
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Light Independent Photosynthesis - Melvin Calvin watch
- Thread Starter
- 26-09-2010 23:26