paper 1

Question 1

what does Nitrozomonas do?

Answer 1

converts ammonium to nitrite
(NH4+ ———-> NO2-)

Question 2

what does Nitrobacter do?

Answer 2

converts nitrite to nitrate
NO2- ——->NO3-

Question 3

what does azotobacter do?

Answer 3

converts nitrogen in air to ammonium
(nitrogen fixing)

Question 4

what does rhizobium do and where is it found?

Answer 4

converts nitrogen gas to ammonium and is found in root nodules of legumes

Question 5

what does psuedomonas do?

Answer 5

-converts nitrate to nitrogen gas
- found in waterlogged soil

Question 6

What is NPP and what is the units?

Answer 6

the plant biomass that is available to the consumer (herbivore). Does NOT include energy used in respiration
Kj m^-2 y^-1

Question 7

what occurs in glycolysis

Answer 7

1- glucose is converted to hexose phosphate using 2 ATP
2- hexose phosphate is split into two molecules of triose phosphate
3- each TP phosphorylates 2 molecules of ADP to form ATP. They also reduce NAD to NADH (reduced NAD). The end product is pyruvate!

Question 8

what occurs in link reaction

Answer 8

pyruvate is decarboxylated and also reduces NAD.
Co enzyme A also joins to form acetyl CoA.

Question 9

what occurs in Krebs cycle

Answer 9

-acetyl joins 4C to form a 6C (citrate). this is decarboxylated and also reduces NAD.
-[5C] decarboxylated once more to [4C]
- reduces 3 NAD
reduces 1 FAD
-phosphorylates one molecule of ADP

Question 10

why is oxygen described as final electron acceptor

Answer 10

2 electrons + 2H+ + 1/2O2 = H2O