IBCLC Practice Exam 2025 – Complete Preparation Guide

Question: 1 / 435

Which of the following substances has the lowest molecular weight?

Caffeine

Caffeine has the lowest molecular weight among the substances listed. The molecular weight of caffeine is approximately 194.19 g/mol, which is significantly lower than that of insulin and albumin. Insulin, a peptide hormone, has a molecular weight around 5,800 g/mol, while albumin, a serum protein, has a molecular weight of roughly 66,500 g/mol. Alcohol, specifically ethanol, has a molecular weight of about 46.07 g/mol, which is lower than that of insulin and albumin but higher than caffeine. This distinction in molecular weight plays a crucial role in various biochemical processes and pharmacokinetics, influencing factors such as absorption and distribution in the body. Understanding these differences helps in fields such as nutrition, pharmacology, and lactation consulting, where the behaviors of these substances can impact maternal and infant health.

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Alcohol

Insulin

Albumin

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