Neco 2018 Biology Question 18

Practice objective / multiple choice question 18 from the 2018 Neco Biology examination.

Neco 2018 Biology Objective / Multiple Choice Medium Difficulty
Question 18 NECO • 2018 • BIOLOGY • objective
Neco 2018 Biology Question 18 diagram

During a steady‑state exercise test a subject's measured gas exchange values are: \(V_{\text{CO}_{2}} = 180\ \text{mL\,min}^{-1}\) and \(V_{\text{O}_{2}} = 200\ \text{mL\,min}^{-1}\).\n\n(a) Calculate the respiratory quotient (RQ) and state which metabolic substrate(s) are predominantly being oxidised.\n\n(b) If the subject switches to a diet in which 70 % of the metabolised energy is derived from fat (RQ≈0.70) and the remaining 30 % from carbohydrate (RQ≈1.00), what RQ would you expect under the new diet?

Answer Options

A. (a) RQ = 0.85, indicating mixed carbohydrate‑fat oxidation with a predominance of fat. (b) Expected RQ ≈ 0.73.
Correct Answer B. (a) RQ = 0.90, indicating mixed carbohydrate‑fat oxidation with a predominance of carbohydrate. (b) Expected RQ ≈ 0.79.
C. (a) RQ = 1.00, indicating pure carbohydrate oxidation. (b) Expected RQ ≈ 0.85.
D. (a) RQ = 0.80, indicating mixed oxidation with a predominance of fat. (b) Expected RQ ≈ 0.76.
Correct Answer
B
Correct Option:
(a) RQ = 0.90, indicating mixed carbohydrate‑fat oxidation with a predominance of carbohydrate. (b) Expected RQ ≈ 0.79.

About This Question

This is Neco 2018 Biology Question 18. It is one of the objective questions from the 2018 Neco Biology examination.

Difficulty level: Medium .

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