nitrogen fixation - Great Lakes

Question

A glutamine-dependent signaling cascade that initiates this process begins with de-uridylation of P-II and GlnK, culminating in the transcription of nif genes. For 10 points each:

[10m] Name this process. An enzyme central to this process uses 16 ATP molecules in tandem with molybdenum-iron or vanadium-iron cofactors to reduce its triply-bonded substrate.

ANSWER: nitrogen fixation [prompt on nitrogen assimilation; prompt on assimilation or fixation]

[10h] Low nitrogen triggers rhizobia to secrete signaling lipochitooligosaccharides (“lipo-kite-oh-oligo-saccharides”), which are factors named for stimulating and forming these structures. These structures are mutualistic interaction sites between plants and nitrogen-fixing bacteria.

ANSWER: nodules [prompt on nod factors or nodulation]

[10e] Nodules are affixed to these plant organs, which are responsible for uptake of inorganic nutrients and water from soil.

ANSWER: roots

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Summary


Northern California	Main	Y	3	16.67	100%	33%	33%
Southern California	Main	Y	5	16.00	100%	40%	20%
Eastern Canada	Main	Y	7	14.29	100%	43%	0%
Florida	Main	Y	2	10.00	100%	0%	0%
Great Lakes	Main	Y	3	13.33	100%	0%	33%
Lower Mid-Atlantic	Main	Y	5	18.00	100%	40%	40%
Upper Mid-Atlantic (1)	Main	Y	7	18.57	100%	43%	43%
Upper Mid-Atlantic (2)	Main	Y	2	15.00	100%	50%	0%
Lower Midwest	Main	Y	4	20.00	100%	75%	25%
Upper Midwest	Main	Y	8	16.25	100%	25%	38%
North	Main	Y	1	10.00	100%	0%	0%
Northeast	Main	Y	8	11.25	100%	13%	0%
Northwest	Main	Y	3	16.67	100%	33%	33%
Southeast	Main	Y	5	14.00	100%	0%	40%
UK	Main	Y	7	15.71	100%	14%	43%
Upstate NY	Main	Y	1	10.00	100%	0%	0%

Data


OSU A	Pitt A	0	10	10
OSU B	MSU A	10	10	20
OSU D	CWRU A	0	10	10