Nutrition modes Flashcards
1
Q
autotroph
A
can synthesize its own energy
2
Q
photoautotroph
A
use light energy to synthesize organic molecules (CO2)
ex. tree
3
Q
chemoautotroph
A
use chemical energy, synthesize organic molecules (CO2)
ex. nitrogen fixing bacteria
4
Q
photoheterotroph
A
use light energy, need to get organic molecules from an external source
ex. heliobacteria
5
Q
chemoheterotroph
A
use chemical energy, need to get organic molecules from external source
ex. humans
6
Q
what are the four main elements?
A
- nitrogen
- oxygen
- hydrogen
- carbon
7
Q
where does nitrogen (N2) come from?
A
produced by bacteria
8
Q
what is nitrogen fixation?
A
N2 gas is converted to NH3
N2 cannot be broken down because of strong bonds so it is converted to ammonia to make it useable
