Plant Environmental Regulators - 12Activities that occur seasonally, as opposed to daily, are referred to asphotoperiodism (responses to changing day or night length) and are regulated byinternal biological clocks in both plants and animals. Photoperiodism involves thebiological clock’s ability to sense changing day length and seasons. Phytochromecan detect such changes since there is a burst of Pfr synthesis at daylight. Thisburst can be used to reset the plant's biological clock daily. Biological clocks canalso involve temperature cycles.Setting biological clocks in any organism involves genetic controls with feedbackmechanisms that ensure that the biological clock “keeps time”. A transcriptionfactor that inhibits the gene that codes for the transcription factor is a likelyclock-setter. As the transcription factor accumulates it inhibits itself. If thetranscription factor concentration declines, the gene is activated and more proteinproduct accumulates.
This is the end of the preview.
access the rest of the document.
As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.
Temple University Fox School of Business ‘17, Course Hero Intern
I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.
University of Pennsylvania ‘17, Course Hero Intern
The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.