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Select the INCORRECT pair.
Lactic acid – 4 carbon molecules
Pyruvate – 3 carbon molecules
Glucose – 6 carbon molecules
Ethanol – 2 carbon molecules
Lactic acid – 4 carbon molecules
Identify the biological fact of carbon content per molecule; Lactic acid has 3 carbons, not 4.
Identify the biological fact of carbon content per molecule; Lactic acid has 3 carbons, not 4.
Analyze the chemical composition
Evaluate the carbon count for each mentioned molecule: Glucose (C6H12O6) has 6 carbons. Pyruvate (C3H4O3) has 3 carbons. Ethanol (C2H5OH) has 2 carbons. Lactic acid (C3H6O3) has 3 carbons.
Identify the mismatch
The pair 'Lactic acid - 4 carbon molecules' is incorrect because Lactic acid contains only 3 carbon atoms per molecule.
B: Pyruvate is correctly identified as a 3-carbon molecule. C: Glucose is correctly identified as a 6-carbon molecule. D: Ethanol is correctly identified as a 2-carbon molecule.
A is correct because Lactic acid is a 3-carbon compound, making the given statement of 4 carbon molecules scientifically false.
In biology-based reasoning questions, memorize the basic carbon skeletons of common metabolic intermediates (Glycolysis path) to quickly spot factual errors.
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