4/23 lecture Flashcards
1
Q
Hormone (def)
A
signaling molecules made by cells that modulate processes in other distant cels
2
Q
positive feedback (def)
A
response induces more response
3
Q
negative feedback (def)
A
response inhibits more response
4
Q
homeostasis (def)
A
maintenance of a constant physiological state
5
Q
what 6 things do auxins promote?
A
- cell elongation in stem and coleoptile
- formation of adventitious roots
- cell division in the presence of cytokinins
- wound healing
- ethylene production
- tropical responses to the environment
6
Q
What 3 things doe auxins inhibit?
A
- axillary bud growth
- fruit abscission
- root elongation
7
Q
Where is auxin made>
A
in shoot and root apical meristem
8
Q
how is auxin transported?
A
via cell to cell transport or phloem
9
Q
polar transport (def)
A
cell to cell transport in only one direction (faster than diffusion, slower than phloem
10
Q
ARF (auxin response factors)
A
promote the expression of auxin response genes
11
Q
Aux/IAA repressors
A
repress the action of ARFs in when auxin is not present
