Neco 2024 Biology Question 29

Practice objective / multiple choice question 29 from the 2024 Neco Biology examination.

Neco 2024 Biology Objective / Multiple Choice Medium Difficulty
Question 29 NECO • 2024 • BIOLOGY • objective

A subject's resting gas exchange rates are VO\(_2\)=250 mL min\(^{-1}\) and VCO\(_2\)=200 mL min\(^{-1}\). During moderate exercise the rates rise to VO\(_2\)=1500 mL min\(^{-1}\) and VCO\(_2\)=1350 mL min\(^{-1}\). (a) Calculate the respiratory quotient (RQ) at rest and during exercise. (b) Based on the RQ values, indicate the predominant metabolic substrate (carbohydrate or fat) at each state. (c) Estimate the energy expenditure (kcal min\(^{-1}\)) for both rest and exercise using the linear interpolation: kcal per L O\(_2\)=4.7 + (RQ‑0.7)×1.1667.

Answer Options

Correct Answer A. Rest: RQ = 0.80, mainly fat; Energy ≈ 1.20 kcal min⁻¹. Exercise: RQ = 0.90, mainly carbohydrate; Energy ≈ 7.40 kcal min⁻¹.
B. Rest: RQ = 0.82, mainly fat; Energy ≈ 1.30 kcal min⁻¹. Exercise: RQ = 0.90, mainly carbohydrate; Energy ≈ 6.50 kcal min⁻¹.
C. Rest: RQ = 0.85, mainly carbohydrate; Energy ≈ 1.50 kcal min⁻¹. Exercise: RQ = 0.95, mainly carbohydrate; Energy ≈ 8.20 kcal min⁻¹.
D. Rest: RQ = 0.78, mainly fat; Energy ≈ 1.10 kcal min⁻¹. Exercise: RQ = 0.88, mainly fat; Energy ≈ 6.80 kcal min⁻¹.
Correct Answer
A
Correct Option:
Rest: RQ = 0.80, mainly fat; Energy ≈ 1.20 kcal min⁻¹. Exercise: RQ = 0.90, mainly carbohydrate; Energy ≈ 7.40 kcal min⁻¹.

About This Question

This is Neco 2024 Biology Question 29. It is one of the objective questions from the 2024 Neco Biology examination.

Difficulty level: Medium .

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