Answer: Option D. -> Broken into acetyl groups
:
D
Fatty acids enter the Kreb's cycle as Acetyl CoA molecules.

Answer: Option B. -> Twice
:
B
For one glucose molecules, there will be two rounds of Krebs cycle. This is because two molecules of Pyruvic acid are formed from one molecule of glucose during Glycolysis.

Answer: Option C. -> Electron transport system
:
C
Amphibolic pathways are pathways that are catabolic and anabolic in nature, that is, they bring about breakdown of biomolecules to generate energy and they create intermediate molecules that can be channelled into different biosynthesis pathways. Kreb's cycle, glycolytic pathway are all examples of amphibolic pathways, because they generate net ATPs and also build up many intermediate biomolecules that are used up for synthesis of aminoacids, carbohydrates, fats etc. The only pathway given here that is not amphibolic is the Electron transport system (ETS). The ETS is purely catabolic in nature, as it causes the production of ATP through oxidative phosphorylation and the byproducts produced are water and carbon dioxide that can not be used for production of any biomolecules.

Answer: Option D. -> Alcohol and CO2
:
D
The products of anaerobic respiration are alcohol and $C{O}_2$

Answer: Option C. -> 200 ATP and 40 CO2
:
C
Aerobic respiration released 38 molecules of ATP and 6 molecules of $C{O}_2$ for every Glucose molecule. Therefore if 5 molecules are respired, then it forms $38\times 5=190$
ATPs and $6\times 5=30C{O}_2$ molecules.
During anaerobic respiration one molecule of glucose releases 2 molecules of ATP and 2 molecules of $C{O}_2$ for one glucose molecule. That is a total of 10 ATPs and 10 $C{O}_2$ molecules. Therefore together we get a total of 190 + 10 = 200 ATP molecules and 30 + 10 = 40 $C{O}_2$ molecules.

Answer: Option C. -> Glycolysis – Krebs cycle – Electron transport chain
:
C
Cellular Respiration is the process in which energy stored in a glucose molecule is released by oxidation. Hydrogen atoms are lost by glucose and gained by oxygen. Cellular respiration begins with glycolysis in the cytoplasm, the glycolytic product then enters the Kreb's cycle and the electrons produced by the breakdown of these products is stored in an electron acceptor as NADH. The NADH formed is then channelled into the ETC to produce a chemiosmotic gradient, that drives the formation of ATP.
Therefore the correct order is Glycolysis ----------> Kreb's cycle ------> ETC

Answer: Option A. -> Human muscles
:
A
Lactic acid is formed in fermentation. Lactic acid can also be formed in human muscles during anaerobic respiration.

Answer: Option B. -> Chemiosmosis
:
B
In aerobic cellular respiration, ATP production through chemiosmotic synthesis is linked to the proton gradient generated by the Electron transport system. 30-32 molecules of ATP are generated by chemiosmosis during breakdown of one molecule of glucose. Whereas only about 8 molecules are formed through substrate level phosphorylation, that is transfer of a high energy phosphate group from a substrate to ADP.

Answer: Option C. -> C6H12O6+6 O2→6 CO2+6 H2O+energy
:
C
Aerobic cellular respiration is the breakdown of a glucose molecule in the presence of oxygen to form carbon dioxide, water and energy. The energy is produced in the form of ATP molecules.
Therefore this equation is the true representation of aerobic cellular respiration.

Answer: Option D. -> Tricarboxylic acid cycle and Citric acid cycle
:
D
Tricarboxylic acid cycle is also known as the citric acid cycle or Krebscycle. This is an aerobic process which takes place in the matrix of the mitochondria. Krebs discovered this cycle in 1937. So, this is known as Hans Krebscycle.