Final answer:
Glucose and fructose form the disaccharide sucrose through a dehydration reaction, resulting in a glycosidic bond between them.
Step-by-step explanation:
When the monosaccharides glucose and fructose molecules join together, answer A) A disaccharide is formed is correct. The specific disaccharide formed is sucrose, which is commonly known as table sugar. This occurs through a dehydration reaction, where a hydrogen atom from one monosaccharide bonds to a hydroxyl group of the other, releasing a water molecule and forming a glycosidic bond between the two sugars. Examples of other common disaccharides include lactose, formed from glucose and galactose, and maltose, formed from two glucose molecules. A glycosidic bond is a covalent bond that links a carbohydrate molecule to another molecule, in this case, two monosaccharides, such as when forming sucrose.