Glycosidic bonds form via condensation and hydrolyze exergonically

Steps:

• Statement 1 is correct: Glycosidic bonds form by condensation (dehydration) between the anomeric OH of one sugar and an OH of another, releasing water.
• Statement 2 is incorrect: Bonds form specifically between the anomeric carbon and an OH oxygen, not generically "between OH groups"; they can also link to non-OH groups like nitrogen in nucleosides.
• Statement 3 is incorrect: Bonds form between C1 of one sugar and C2, C4, or C6 of another, not only C1-C4.
• Statement 4 is correct: Hydrolysis breaks the bond, adding water and releasing energy as in carbohydrate digestion.

Why B is correct:

• B selects statements 1 and 4, matching the definition of glycosidic bonds as condensation products whose hydrolysis is exergonic per biochemical principles.

Why the others are wrong:

• A includes incorrect statements 2 and 3.
• C includes incorrect statement 2.
• D includes incorrect statement 3.

Final answer: B