Plant Hormones

Question 1

Who isolated ethylene

Answer 1

Gane

Question 2

Who isolated auxin

Answer 2

Hagen smit

Question 3

Who isolated gibberelin

Answer 3

McMillan and sutter

Question 4

Who isolated cytokinin

Answer 4

Leatham

Question 5

Who isolated abscisic acid

Answer 5

Cornforth

Question 6

3 types of cell surface hormone receptors

Answer 6

Ion channel linked, G protein linked, and enzyme linked

Question 7

auxin(s) contain _________ structures and are derived from the amino acid ________ from the __________ via the ________ pathway

Answer 7

heterocylic structures, tryptophan, pentose phosphate pathway, Shikimic acid

Question 8

cytokinin(s) contain _______ structures but is derived from combination ______ byproducts (adenosine mono-phosphate; AMP) and _____ from terpenoid synthesis

Answer 8

heterocyclic, pentose phosphate pathway, DMAPP

Question 9

gibberellins and abscisic acid are both _______ derivatives

Answer 9

terpenoid

Question 10

ethylene begins as ____

Answer 10

methionine

Question 11

Gibberellin (gibberellic acid - GA) is not a _____ hormone, but a _____ of hormones

Answer 11

Single, class

Question 12

which hormones causes a disease on rice that makes the plants grow very tall called “foolish seedling disease”

Answer 12

Giberellin

Question 13

As GA is important for the early life history of plants it is responsible for:

Answer 13

seed germination
stem/root growth
plant sexual maturation (juvenile to adult) including derivation of gametophytic tissue (gametes include pollen and eggs)

Question 14

Following sexual maturation GAs are responsible for:

Answer 14

pollen tube growth which occurs during fertilization
fruit growth (parthenocarpy)

Question 15

GA is key for seedling emergence from it’s _____

Answer 15

dormant state

Question 16

Imbibition

Answer 16

Germination begins as water is able to penetrate the seed coat

Question 17

DELLA proteins are ________!

Answer 17

transcriptional inhibitors

Question 18

In the aleurone cells:

a secondary signal from the binding of GA with the receptor enters the nucleus and binds with ______ proteins which interact with DNA

Answer 18

Della

Question 19

Auxin usually is located on

Answer 19

The tips of the plants

Question 20

Auxin is associated with

Answer 20

Tryptophan synthesis

Question 21

Auxin transport is

Answer 21

Basipedal (from tip to root)

Question 22

Auxin needs to bind to _____ therefore making it stay in _____ form as it is transported

Answer 22

Other compounds such as sugars, inactive

Question 23

Auxin is moved through

Answer 23

Diffusion

Question 24

cytokinin is primarily synthesized in the ______ zone, then are transported through the plant in the _______ (acropetal)
can also be transported basipetally via _____ as well…
in the root localized effect is to:
increase cell division and differentiation (root growth)
to produce lateral roots
in the stem, promotes lateral bud development

Answer 24

root differentiation zone, root xylem, root differentiation zone,

Question 25

Ethylene promotes

Answer 25

fruit ripening and flower senescence
cell wall breakdown, production of pigments, can include a burst of respiration
climacteric – fruit ripening (starch breakdown – sugars!) induced by ethylene (bad apples…)
leaf and fruit abscission
breakdown of cells (apoptosis) in a specific region of stem / petiole for shedding

Question 26

Abscisic acid (ABA) production occur primarily in

Answer 26

Plastid. can be synthesized throughout the plant, where there are plastids, but is primarily made in roots

Question 27

ABA is transported through

Answer 27

Xylem and phloem