4/16 lecture Flashcards
1
Q
What is cryptochrome?
A
blue-light receptor found in the cytoplasm and nucleolus, but does not mpve; absorption of blue photons changes protein shape and allows it to bind to other proteins
2
Q
what is a chromophore?
A
part of the protein that absorbs light
3
Q
How do plants tell what season it is?
A
by the length of nights, not days
4
Q
how do circadian rhythms work?
A
rhythmic oscillations in gene expression allow plants to remember when day/night are supposed to occur; light input trains the clock; responses governed by the biological clock
5
Q
what does cryptochrome inhibit?
A
stem elongation
6
Q
Photomorphogenesis
A
COP1 suppresses light responses in the dark; activated photoreceptors release suppression by COP1
