Department of Energy Argonne National Laboratory Office of Science NEWTON's Homepage NEWTON's Homepage
NEWTON, Ask A Scientist!
NEWTON Home Page NEWTON Teachers Visit Our Archives Ask A Question How To Ask A Question Question of the Week Our Expert Scientists Volunteer at NEWTON! Frequently Asked Questions Referencing NEWTON About NEWTON About Ask A Scientist Education At Argonne Chlorophyll Manufacturing in Plants
Name: Nathan
Location: N/A
Country: N/A
Date: N/A

There is a common bioloby laboratory activity where tobacco or corn is grown in the dark. The plant appears spindly, and is colored either yellow or white. Upon exposure to light, the plant turns green.

What is it about the light that allows the chlorophyl to be manufactured? Is there something with enzymes? Perhaps a gene repression process? Perhaps photo-oxidation of a suppressor protein?

Dear Nathan,

Perhaps the following may be helpful:


Anthony R. Brach

Click here to return to the Biology Archives

NEWTON is an electronic community for Science, Math, and Computer Science K-12 Educators, sponsored and operated by Argonne National Laboratory's Educational Programs, Andrew Skipor, Ph.D., Head of Educational Programs.

For assistance with NEWTON contact a System Operator (, or at Argonne's Educational Programs

Educational Programs
Building 360
9700 S. Cass Ave.
Argonne, Illinois
60439-4845, USA
Update: June 2012
Weclome To Newton

Argonne National Laboratory