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

Practise IB Biology HL 1.2.17 by applying lipids vs. carbohydrates as substrates concepts to exam questions.

Exam points

Compare triglycerides and glucose as respiratory substrates.
Explain that triglycerides release more energy per gram because they contain more oxidizable carbon and hydrogen.
Relate greater energy release to oxidation of the more reduced carbon-rich lipid substrate.

[Maximum number: 2]

A triglyceride is shown.

Figure for Question IB Biology HL C1.2.17 Hl Lipids Vs Carbohydrates As Substrates Questions question 1 — IB Biology HL

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.

2 max

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