Test 2

Question 1

cycle in which N flows through biosphere

Answer 1

nitrogen cycle

Question 2

incorporation of N into organic molecules beginning with fixation of N2 to form NH3

Answer 2

Nitrogen fixation

Question 3

reduction

Answer 3

fixation

Question 4

fixation

Answer 4

reduction

Question 5

Limiting factor in plant growth an development

Answer 5

nitrogen supply

Question 6

all N in plants are assimilated by converting it to

Answer 6

the amide group in glutamine

Question 7

Organic N is mineralized when plants die turning back to

Answer 7

NH3, NO3, NO2

Question 8

Nitrogen fixation breaks a ____ _____ bond

Answer 8

nonpolar triple

Question 9

Comercial nitrogen fixation uses ________ reaction, being heated to ____ to _____ degrees C, under ____ to _____ atm pressure

Answer 9

Haber-bosch, 400,650,200,400

Question 10

Energy minimum for N fixation ____ for one N2 to 2 ammonia molecules (2NH4)

Answer 10

16ATP

Question 11

Bacteria that fix N

Answer 11

diazotrophs

Question 12

The most important enzyme in nitrogen assimilation

Answer 12

glutamine synthetase

Question 13

contain all of the essential amino acids.

Answer 13

complete proteins

Question 14

where amino acids enter the blood

Answer 14

intestinal enterocytes

Question 15

______ adjust the concentrations of amino acids

Answer 15

metabolic mechanisms

Question 16

The entry point for nitrogen is!

Answer 16

glutamine

Question 17

Branched amino accids tend to leave from the _____ rather than the ____

Answer 17

liver, GI track

Question 18

most aminotransferases use _____ as the amino group donor

Answer 18

glutamate