Two monosaccharides are bound together by
(a) alcohol group
(b) glycosidic bond
(c) ketone group
(d) removal of water

Options

A. alcohol group
B. glycosidic bond
C. ketone group
D. removal of water

Answer

To answer the question about how two monosaccharides are bound together, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Monosaccharides**: Monosaccharides are the simplest form of carbohydrates, consisting of single sugar units. Examples include glucose and fructose.

2. **Formation of Disaccharides**: When two monosaccharides combine, they form a disaccharide. This process is essential in carbohydrate chemistry.

3. **Type of Reaction**: The combination of two monosaccharides involves a specific type of reaction known as a dehydration reaction (or condensation reaction). In this reaction, a molecule of water is removed.

4. **Bond Formation**: During the dehydration reaction, a covalent bond is formed between the two monosaccharides. This bond is specifically called a glycosidic bond.

5. **Identifying the Correct Option**:
- Option (a) alcohol group: This is not correct as alcohol groups are functional groups, not the type of bond formed.
- Option (b) glycosidic bond: This is correct as it is the bond formed between the two monosaccharides.
- Option (c) ketone group: This is also incorrect as ketone groups are not involved in the bonding of monosaccharides.
- Option (d) removal of water: While this is part of the process, it does not specify the bond type.

6. **Conclusion**: Therefore, the correct answer is (b) glycosidic bond.

### Final Answer:
(b) glycosidic bond

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