IB Biology HL 1.2.17 Lipids vs. carbohydrates as substrates Question Bank

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

Exam points

identify the relevant biological structure, process or evidence
apply the correct biological mechanism to the question
evaluate the result using data, adaptation or ecological reasoning

[Maximum number: 2]

A triglyceride is shown.

Figure for Question C1.2.17 (HL)—Lipids vs. carbohydrates as substrates 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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C1.2.17 (HL)—Lipids vs. carbohydrates as substrates question 1