Top Posters
Since Sunday
5
o
5
4
m
4
b
4
x
4
a
4
l
4
t
4
S
4
m
3
s
3
New Topic  
mex mex
wrote...
Posts: 9
Rep: 0 0
7 years ago
http://imgur.com/a/bJ7fx

Hi, for this question it asks 'Name the radioactive molecule which was transported from source to sink'. Since 14CO2 is the radioactive molecule, why isn't the answer carbon-14? The answer is sucrose which I don't understand.

The second question asks what tissue and cell do you expect to find the most radioactive molecule in. Why will the cell not be the root hair cells?  Is it because the plant isn't growing in the soil?

Thanks
Read 530 times
3 Replies
Replies
wrote...
Valued Member
Educator
7 years ago
The carbon dioxide is incorporated into the sugar that is made during photosynthesis. The sink is the sugar that is made, and since sugar is made from carbon-carbon bonds, that is derived from the carbon dioxide that the leaves take in.
mex Author
wrote...
7 years ago
So this is why sucrose has also become radioactive?

Can you also answer my second question please?

Thanks
Post Merge: 7 years ago

The carbon dioxide is incorporated into the sugar that is made during photosynthesis. The sink is the sugar that is made, and since sugar is made from carbon-carbon bonds, that is derived from the carbon dioxide that the leaves take in.
  So this is why sucrose has also become radioactive?

Can you also answer my second question please?

Thanks
Answer accepted by topic starter
bio_manbio_man
wrote...
Valued Member
Educator
Top Poster
Posts: 33225
7 years ago
Sign in or Sign up in seconds to unlock everything for free
This verified answer contains over 150 words.
1

Related Topics

New Topic      
Explore
Post your homework questions and get free online help from our incredible volunteers
  1152 People Browsing
Related Images
  
 646
  
 165
  
 186
Your Opinion
Which 'study break' activity do you find most distracting?
Votes: 741