1. A facultative anaerobic bacteria is currently using cellular respiration to g
ID: 274132 • Letter: 1
Question
1. A facultative anaerobic bacteria is currently using cellular respiration to grow on glucose in the presence
of oxygen. How much ATP would it generate from the NADH it produces from 20 molecules of glucose?
The bacteria is then transferred to an environment without oxygen so it switches to lactic acid
fermentation. What is different about its metabolic processes now. How much total ATP will it produce
from 20 molecules of glucose?
2. Diagram or describe the similarities and differences between the electron transport chain in
photosynthesis and cellular respiration.
3.Explain the difference between a phototroph and a chemotroph? Explain the difference between a
heterotroph and an autotroph?
4. Some obligate anaerobes run an electron transport chain to produce energy. How would their electron
transport chain differ from a human’s.
5.Describe or diagram the process of DNA replication. Be sure to include all necessary protein
components.
Explanation / Answer
Ans:2:- Simililaties between the electron transport chain in photosynthesis and cellular respiration:-
1. Both involves the movement of electrons in a chain.
2. they both involve the exchange of the gasses,oxygen and carbon dioxide.
differences between the electron transport chain in photosynthesis and cellular respiration:-
1. one occurs in chloraplast and other occur in mitochondria.
2. the electron carriers used in the photosynthesis are NADPH and aerobic respiration use NADH and FADH2.
3.the electron transport chain in photosynthesis uses plastoquinone and phylloquinone to move electron within the membrane while as ETC in cellular respiration use lipid soluble electron carrier ubiquinone to move electrons within the membrane.
4. electrons transport chains are embedded in thylokoid membrane of the chloroplasts while as ETC are embedded in inner membrane of mitochondria.
5. electrons in photosynthesis are derived using light energy to split water molecules in photolysis which produces oxygen while in cellular respiration electrons are derived from catabolic oxidation of nutrients.
Ans:3 :- Difference between a phototroph and a chemotroph:-
1. in case of phototrophs protons are captured in order to acquire energy where in case of chemotrophs energy is acquired by oxidizing electron donors (chemical oxidation), phototrops use sunlight to produce ATP to carry out cellular functions where as chemotrophs use inorganic or organic compounds and obtain the energy through oxidation.
2. Phototrophs are classified into two main groups photoautotrophs and photoheterotrophs whereas chemotrophs are classified into chemoautotrophs and chemoheterotrophs.
3.some of the examples of phototrophs are Green plants, algae, cyanobacteria, heliobacteria, green non-sulfur bacteria, purple non-sulfur bacteria. some of the examples of chemotrophs are homoacetogenic bacteria, methanogenic bacteria, sulfur and iron bacteria, infectious bacteria, and fungi.
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