Question

sucrose and lactose are disaccharides that have the same chemical formula, c12h22o11. however, these sugars have different characteristics and behave differently in chemical reactions. which of the following generalizations can explain this?
disaccharides are used for different cellular processes, and they only take part in reactions in which they are needed.
disaccharides are different in structure because they are not made up of the same monosaccharides, and this gives them different properties.
disaccharides are made from the same monosaccharides, but the monosaccharides are differently arranged, resulting in different properties.
disaccharides have different properties, but the polysaccharides they form when combined with other molecules will have the same properties.
question 15 (1 point)
(01.02 mc)
maltase is an enzyme that breaks down the disaccharide maltose into glucose molecules. the reaction usually takes place at a ph between 6 and 7. which of the following best describes what would happen if the ph were decreased to 3?
maltase would not be able to function outside of its optimal ph range.
maltase would react with glucose molecules to form a new disaccharide.
maltose would break down into twice as many glucose molecules.
maltose would break down into monosaccharides other than glucose.

Explanation:

For the first question:
Sucrose is made of glucose and fructose, while lactose is made of glucose and galactose. Different monosaccharide composition leads to different structures, and structure determines function and properties.
For the second question:
Enzymes have an optimal pH range for activity. Maltase functions best at pH 6 - 7. A pH of 3 is too acidic and will likely denature the enzyme (change its shape), preventing it from functioning.

Answer:

First question: B. Disaccharides are different in structure because they are not made up of the same monosaccharides, and this gives them different properties.
Second question: A. Maltase would not be able to function outside of its optimal pH range.