Inter Botany subject. The questions are useful for AP and Telangana
Intermediate students. The questions and answers are from Respiration
in Plants chapter.
Q: Explain various complexes involved in Electron Transport System of
respiration.
A: ETS involves 5 complexes.
1. Complex I = NADH dehydrogenase
2. Complex II = Succinic dehydrogenase
3. Complex III = Cytochrome C reductase
4. Complex IV = Cytochrome C oxidase
5. Complex V = ATP synthase
These are all present in inner membrane of mitochondrion.
Complex I receives e− from Mitochondrial NADH2 and conveys it to
complex III through UQ.
Complex II receives e− from FADH2 and conveys it to complex through UQ.
Complex III gives e− to complex IV through cyt C.
Complex IV gives e− to oxygen.
Complex V forms ATP by oxidative phosphorylation.
Q: Describe the structure of complex V and explain the process of
oxidative phosphorylation as explained by chemiosmotic hypothesis.
A: Complex V is chemically a proteinaceous enzyme called ATP synthase.
It has two parts. 1) F0, 2) F1. The enzyme is present in
the inner membrane of mitochondria. F0 is present towards
perimitochondrial space and F1 is protruded into the matrix.
F0 forms proton channel. Protons pass through F0 and fall into F1. It
is the head piece and rotates always. It is the site of protein
synthesis. Peter mitchel proposed chemi osmotic model. According
concentration gradient, H+ from perimitochondrial space pass through
F0 into F1. For every
3H+, 1 ATP is produced.
Q: What is the common pathway for aerobic and anaerobic respirations?
Where does it take place? (2 Marks)
A: The common pathway for aerobic and anaerobic respirations. It
occurs in cytosol where all the enzymes (10) required for it are
present.
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