Final answer:
A fat molecule, commonly called a triglyceride, consists of 3 fatty acid molecules and a single glycerol molecule, making option B the correct answer.
Step-by-step explanation:
The fat molecule question asked which of the provided choices constitutes a fat molecule. The correct answer is that a fat molecule is composed of 3 fatty acid molecules and a single glycerol molecule. Specifically, a fat molecule, often known as a triglyceride, is formed when each of the three hydroxyl (OH) groups on the glycerol molecule is esterified with a fatty acid, resulting in the creation of three ester bonds through a dehydration synthesis reaction.
A fat molecule does not consist of a single carbon, hydrogen, and oxygen atom (incorrect option A), nor does it consist of 3 glycerol molecules and a single fatty acid (incorrect option D). A typical triglyceride is made from naturally occurring fats and oils and often contains two or three different fatty acid components, as opposed to all the same, thus called a mixed triglyceride.