Cytokinins

Question 1

cytokinins control – and central in plant growth and dev

Answer 1

cell division

Question 2

plant cell that retain its nucleus at – is capable of dividing

Answer 2

maturity

Question 3

A. tumefaciens can invade wounds and cause plant tumors, –, via cytokinin response

Answer 3

crown galls

Question 4

tissue removed from crown galls into culture media will grow as a mass of disorganized, relatively undifferentiated cells called –

Answer 4

callus tissue

Question 5

isolated from autoclaved herring sperm DNA that promoted cell division – (not naturally occurring)

Answer 5

kinetin

Question 6

extracts from maize endosperm that promoted cell division

Answer 6

zeatin

Question 7

causes lateral buds to grow in concert

Answer 7

witches broom

Question 8

A. tumefasicens contain – which is incorporated into the nuclear DNA of the host plant cell and which expresses a gene that drives cytokinin production

Answer 8

Ti plasmid

Question 9

cytokinins are synthesized in –

Answer 9

root apical meristem

Question 10

cytokinins move through – into the shoot

Answer 10

xylem

Question 11

zeatin increases the rate of –

Answer 11

cytokinesis

Question 12

cytokinin – root growth

Answer 12

suppresses

Question 13

over expression of cytokinin oxidase leads to reduction in cell proliferation in the apical meristem and – of root growth

Answer 13

enhancement

Question 14

cytokinins also promote – of cotyledons and leaves

Answer 14

expansion

Question 15

cytokinins also increase the extensibility of cell walls but do not rely on – like auxin

Answer 15

proton extrusion

Question 16

cytokinin stimulate bud formation from the – in mosses (filament of cells arising from the germination of moss spores)

Answer 16

protonema

Question 17

detached leaves lose chlorophyll, RNA, lipids, and proteins

Answer 17

senescence

Question 18

– leaves produce cytokinin

Answer 18

young

Question 19

mature leaves depend on – cytokinins to postpone their senescence

Answer 19

root-derived

Question 20

cytokinin influence the movement of nutrients into leaves

Answer 20

cytokinin-induced nutrient mobilization

Question 21

in etiolated seedlings, chloroplasts don’t mature but develop into

Answer 21

etioplasts