Homework Help: biology

Posted by jack on Saturday, May 7, 2011 at 9:01am.

14 points Save

A photosynthesis experiment uses Chlorella to track the route taken by 14C in photosynthesis. The 14C is provided from CO2 and no new sources of CO2 are available. After the experiment the scientist extracts all of the starch produced and analyses the Carbon present. She finds that only half of the carbon is 14C. She repeats the experiment with more time and twice as much CO2 and finds that three quarters of the Carbon in the starch is radioactive.

Answer the following questions about the experiment:

Why is there radioactive Carbon in the starch? 2 marks
Why is only some of the Carbon in starch radioactive after the experiment? 2 marks
Using ideas from the Calvin cycle explain why doubling the amount of radioactive Carbon does not lead to all of the Carbon in starch being radioactive. 5 marks
How did Calvin himself use radioactive carbon? 5 marks

PLEASE HELP ME. I GOT A DEADLINE TO MEET TODAY.

biology - SraJMcGin, Saturday, May 7, 2011 at 10:39am
For question one, try some of the following links:

http://search.yahoo.com/search?fr=mcafee&p=why+is+there+radioactive+Carbon+in+the+starch+after+using+Chlorella+in+a+photosynthesis+experiment

For question 2, there may be some new links here:

http://search.yahoo.com/search?fr=mcafee&p=why+is+only+some+of+the+Carbon+in+starch+radioactive

The Calvin cycle: http://search.yahoo.com/search?fr=mcafee&p=the+Calvin+cycle

For the next question:

http://search.yahoo.com/search?fr=mcafee&p=why+when+doubling+the+amount+of+radioactive+Carbon+isn%27t+all+the+Carbon+in+starch+radioactive%3F

For the last one:

http://search.yahoo.com/search?fr=mcafee&p=how+did+Calvin+use+radioactive+carbon

Sra
biology - jack, Saturday, May 7, 2011 at 11:31am
hi thanks but these sites are not answering my questions.

Answer this Question

Related Questions

science - biology - A photosynthesis experiment uses Chlorella to track the ...
Chemistry - A skull fragment found in 1936 at Baldwin Hills, California, was ...
9th grade Biology - 4. After the temperature reaches 33 degrees Celcius, the ...
chemistry/math - 100g of bone contain ratio of 14C and 12C. 6.8% 14C is present ...
AP BIOLOGY LAB - I am doing an ap biology lab on plant photosynthesis. It's ...
AP Chemistry - Summary of problem Photosynthesis uses CO2 & H20 to make ...
AP Biology - With regards to photosynthesis, if the following problems occurred...
oceanography - 14C has a half-life of 5,730 years. If we start with 70 grams of ...
biology - Two students conducted experiments to study the rate of photosynthesis...
biology help - Does photosynthesis require energy? What type of energy reaction ...

For Further Reading

First Name:
School Subject:
Answer: