× Didn't find what you were looking for? Ask a question
Top Posters
Since Sunday
p
6
I
6
h
5
k
5
a
5
J
5
k
5
r
5
O
5
x
5
d
4
s
4
New Topic  
colleen colleen
wrote...
Valued Member
Posts: 17077
11 years ago
Compare and contrast cyclic and noncyclic photophosphorylation.
Read 17331 times
1 Reply
Sunshine ☀ ☼

Related Topics

Replies
wrote...
Valued Member
11 years ago
Both cyclic photophosphorylation and noncyclic photophosphorylation are aspects of the light-dependent reactions of photosynthesis. They both involve the excitation of electrons by solar energy; these excited electrons then participate in an electron transport pathway to create a proton gradient that can be used to produce ATP through chemiosmosis. However, as its name implies, cyclic photophosphorylation occurs when electrons return to the chlorophyll molecules whence they came. Excited electrons in noncyclic photophosphorylation are also used in the same way to produce ATP; however, these electrons are donated to an NADP+ molecule at the end of their transport chain, producing NADPH as a product of the system. Because electrons are constantly leaving the chlorophyll molecules where they are being excited, and not returning, there must also be a steady source of electrons for the photosystem. These electrons can come from molecules such as water or hydrogen sulfide.
New Topic      
Explore
Post your homework questions and get free online help from our incredible volunteers
  443 People Browsing
 147 Signed Up Today
Related Images
  
 1434
  
 278
  
 271
Your Opinion
What's your favorite coffee beverage?
Votes: 274