4/21/15

Question 1

Where are phototropins found?

Answer 1

in the plasma and chloroplast membranes

Question 2

What is the phototropin induced response to blue light?

Answer 2

Bending towards the light

Question 3

What is an auxin?

Answer 3

a class of plant hormones that regulate many growth responses including cell elongation

Question 4

How do the plants actually bend towards light?

Answer 4

phototropins induce the reorientation of auxin transporters causing unequal distribution….dark side cells elongate more than light-side cells

Question 5

What happens to chloroplasts exposed to blue light?

Answer 5

they are reoriented; active phototropins induce changes in the cytoskeleton fromactin fibers “pushing” chloroplasts to new locations and hold them in place

Question 6

How does the stomata open (order of operations)??

Answer 6

Blue light–>active phototropins—>signaling cascade—->phosphorylation/active of H+ pump—->k+ enters cell—-> water enters cell

Question 7

Gibberellin hormone responses in plants

Answer 7

germination, growth to maturity, flowering, fruit development

Question 8

Auxin hormone responses in plants

Answer 8

growth to maturity, flowering, fruit development

Question 9

Cytokinins hormone responses in plants

Answer 9

growth to maturity; flowering; fruit development

Question 10

ethylene hormone responses in plants

Answer 10

flowering, fruit development, ascission

Question 11

ABA hormone responses in plants

Answer 11

Ascission, seed dormancy

Question 12

what is a hormone?

Answer 12

signaling made by cells that modulate processes in other distant cells