Biology CH 2: part 3

Question 0

nitrogen cycle

All living things need nitrogen. Name two important biological molecules that contain nitrogen

Answer 0

Proteins and lipids.

Question 1

nitrogen cycle

Since nitrogen-fixing eubacteria make their own food (energy) from nitrogen gas and not the sun, they are called ___

Answer 1

Chemo synthetic

Question 2

nitrogen cycle

Where is the majority of nitrogen on the earth found?

Answer 2

In the atmosphere

Question 3

nitrogen cycle

Is nitrogen in the atmosphere (n2) form usable to most organisms

Answer 3

No

Question 4

nitrogen cycle

Nitrogen fixing bacteria convert atmospheric nitrogen into _____

Answer 4

ammonia (NH3)

Question 5

nitrogen cycle

Some of this ammonia dissolves in water in the soil where it reacts with hydrogen ions to form

Answer 5

Ammonium NH4+

Question 6

nitrogen cycle

What forms of nitrogen are plants able to utilize ?

Answer 6

NH3, NH4+, NO3-

Question 7

nitrogen cycle

What kind of eubacteria convert ammonia ions to nitrate ions?

Answer 7

Nitrifying bacteria

Question 8

nitrogen cycle

What kind of eubacteria convert nitrate ions into nitrate ions?

Answer 8

Nitrifying bacteria

Question 9

nitrogen cycle

What kind of environmental conditions are nitrifying bacteria under?

Answer 9

Aerobic, with the presence of oxygen

Question 10

nitrogen cycle

What type of eubacteria complete the cycle by returning nitrogen to the atomosphere?

Answer 10

Denitrifying bacteria

Question 11

nitrogen cycle

Denitrifying are under what environmental conditions

Answer 11

Anaerobic , no oxygen present

Question 12

nitrogen cycle

What group of plants is associated with nitrogen fixation?

Answer 12

Legumes

Question 13

nitrogen cycle

The planet themselves do not fix the nitrogen, this, instead, is carried out by bacteria which live in the plants _____in swellings called _______

Answer 13

Roots, nodules

Question 14

nitrogen cycle

Driven by ____

Answer 14

Eubacteria

Question 15

nitrogen cycle

78% of atomosphere is made up of nitrogen gas.

Answer 15

.

Question 16

nitrogen cycle

The nitrogen cycle is

Answer 16

The recycling of nitrogen between the biotic, and abiotic parts of our environment.

Question 17

nitrogen cycle

Nitrogen 5 major forms

Answer 17

N2= nitrogen gas
NH3= ammonia 
NH4+= ammonium 
NO3-= nitrate 
NO2-= nitrite

Question 18

nitrogen cycle

_____ _____ eubacterial in soil and legume root modules covert N2 to NH3.

Answer 18

Nitrogen fixing

Question 19

nitrogen cycle

____ eubacteria (2types) convert NH4 to NO2- to NO3-

Answer 19

Nitrifying

Question 20

nitrogen cycle

Anaerobic denitrifying

Answer 20

Eubacteria will convert NO3 back to N2