BISC 261 Lecture Exam with Questions with
100% Correct Answers| Latest Update
2024| Verified
How do chemolithoautotrophs work? - Answer * Organisms that are doing
respiration, but instead of organic carbon as their carbon source, they are using things
like sulfide, hydrogen for their carbon source
- Important primary producers in hydrothermal vents
* Can do aerobic respiration or anaerobic respiration
Do chemolithoautotrophs grow slower than chemoorganoheterotrophs? - Answer * yes,
b/c they have to make precursors like pyruvate while they're growing (energy tax)
What is the most common electron donor for chemolithoautotrophs? - Answer *
hydrogen gas b/c when you oxidize it, you get a free proton
What kind of pathway exists for chemolithoautotrophs? - Answer * carbon fixation
pathway
- inorganic carbon ---> organic carbon
Ammonia - Answer * extremely toxic
* Ammonia oxidizing bacteria (in freshwater) & ammonia oxidizing archaea
(marine) keep ammonia pollution in check
* Ammonia oxidizing archaea are very important for keep ocean life alive
* Use ammonia as an electron donor during cellular respiration
, What are photolithoautotrophs? - Answer * Photosynthetic organisms use light as
an energy source & then you have a separate inorganic electron donor (not the
same thing), & carbon fixation pathways
* Photosynthetic organisms have respiration pathways when the light source goes out
(can do aerobic respiration)
chlorophyll or bacteriochlorophyll - Answer * give organisms their color, the color of
the pigment is the wavelength of light they don't use
What are photosynthetic microbial eukaryotes? - Answer * algae
- main primary producer in the ocean
- chloroplasts let algae do photosynthesis which came from cyanobacteria
What does photosynthesis have? - Answer * light harvesting pigments that are
fine tuned for different wavelengths of light & give phototrophs their pigment
What is infrared driven photosynthesis? - Answer * heat driven photosynthesis
* infrared light goes much further than visible light
For catabolism, what 3 things do we look at? - Answer * Carbon: where does
the organism get its carbon?
* Energy: Where does the organism get its energy?
* Electrons: Where do you get the electrons from?
What are the 2 types of carbon sources? - Answer * Autotrophs: CO2 sole or
principal biosynthetic carbon source
* Heterotrophs: reduced, performed, organic molecules from other organisms
100% Correct Answers| Latest Update
2024| Verified
How do chemolithoautotrophs work? - Answer * Organisms that are doing
respiration, but instead of organic carbon as their carbon source, they are using things
like sulfide, hydrogen for their carbon source
- Important primary producers in hydrothermal vents
* Can do aerobic respiration or anaerobic respiration
Do chemolithoautotrophs grow slower than chemoorganoheterotrophs? - Answer * yes,
b/c they have to make precursors like pyruvate while they're growing (energy tax)
What is the most common electron donor for chemolithoautotrophs? - Answer *
hydrogen gas b/c when you oxidize it, you get a free proton
What kind of pathway exists for chemolithoautotrophs? - Answer * carbon fixation
pathway
- inorganic carbon ---> organic carbon
Ammonia - Answer * extremely toxic
* Ammonia oxidizing bacteria (in freshwater) & ammonia oxidizing archaea
(marine) keep ammonia pollution in check
* Ammonia oxidizing archaea are very important for keep ocean life alive
* Use ammonia as an electron donor during cellular respiration
, What are photolithoautotrophs? - Answer * Photosynthetic organisms use light as
an energy source & then you have a separate inorganic electron donor (not the
same thing), & carbon fixation pathways
* Photosynthetic organisms have respiration pathways when the light source goes out
(can do aerobic respiration)
chlorophyll or bacteriochlorophyll - Answer * give organisms their color, the color of
the pigment is the wavelength of light they don't use
What are photosynthetic microbial eukaryotes? - Answer * algae
- main primary producer in the ocean
- chloroplasts let algae do photosynthesis which came from cyanobacteria
What does photosynthesis have? - Answer * light harvesting pigments that are
fine tuned for different wavelengths of light & give phototrophs their pigment
What is infrared driven photosynthesis? - Answer * heat driven photosynthesis
* infrared light goes much further than visible light
For catabolism, what 3 things do we look at? - Answer * Carbon: where does
the organism get its carbon?
* Energy: Where does the organism get its energy?
* Electrons: Where do you get the electrons from?
What are the 2 types of carbon sources? - Answer * Autotrophs: CO2 sole or
principal biosynthetic carbon source
* Heterotrophs: reduced, performed, organic molecules from other organisms
