Question

169. What percentage of carbon atoms in cholesterol are derived from acetyl-coA?

171. For every starting molecule of glucose, how many NTPs are made directly in the Citric Acid Cycle (not including any ATP made in the ETC)?

174. Under actual cellular conditions, how many strongly exergonic reactions take place in glycolysis?

168. How many fatty acid chains are attached to a membrane phospholipid?

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Answer 1

169. 27 carbon atoms are derived from acetyl-CoA in the synthesis of cholesterol. This takes place in 3 phage synthetic process. Stage one is the synthesis of isopentenyl pyrophosphate, an activated isoprene unit which is the key building block of cholesterol. Stage two is the condensation of 6 molecules of isopentenyl pyrophosphate to form squalene. In stage three, squalene cyclizes in an astounding reaction and the tetracyclic product is subsequently converted into cholesterol.

171. Two carbon atoms come into the citric acid cycle from which the acetyl group representing 4 out of the 6 carbons of one glucose molecule. 2 carbon dioxide molecules are released on each turn of the cycle and however these do not necessarily contain the most recently-added carbon atoms.

174. Under cellular conditions, 10 exergonic steps undergoes in glycolysis cycle in which the glucose is break down into two 3 carbon compounds and generates energy.
168. Phospholipid Molecule A phospholipid is a molecule that contains 2 fatty acids and a modified phosphate group attached to a glycerol backbone. This phosphate will be modified by the addition of charged or polar chemical groups.