IB Biology HL C1.2.17 Hl Lipids Vs Carbohydrates As Substrates Questions

Compare lipid and glucose as fuels: lipids yield more ATP and water per gram, while carbohydrates enter glycolysis quickly in IB Biology HL C1.2.17.

Exam points

Explain that lipids yield more ATP and metabolic water per gram because they are more reduced than carbohydrates.
Explain why carbohydrates are more easily hydrolysed and enter glycolysis quickly.

[Maximum number: 2]

A triglyceride is shown.

Displayed triglyceride structure with a three-carbon backbone joined through oxygen-containing links to three long hydrocarbon chains; all tail carbon–carbon bonds are shown as single bonds.

Explain the reason that more energy is released from one gram of triglyceride than from one gram of glucose in respiration.

a. energy released by oxidation reactions;

b. more carbon/hydrogen (per gram) in triglycerides (than glucose)

OR

more C-C/C-H bonds (per gram) in triglycerides (than glucose);

c. triglycerides in less oxidized/more reduced state/ have less oxygen (per gram than glucose);

d. more acetyl CoA formed (per gram) from triglycerides (than glucose)

OR

more $\mathrm{NADH}_{2} /$ reduced NAD (per gram) from triglycerides (than glucose);

Marking guidance:

Allow vice versa in mpb to mpd.

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IB Biology HL C1.2.17 Hl Lipids Vs Carbohydrates As Substrates Questions question 1