Polysaccharide monomers are linked by

Options

A. Peptide bonds
B. Glycosidic bonds
C. Hydrogen bonds
D. Phosphodiester bonds.

Answer

To answer the question "Polysaccharide monomers are linked by," we will analyze the options provided and understand the structure of polysaccharides.

### Step-by-Step Solution:

1. **Understanding Polysaccharides**:
- Polysaccharides are large molecules made up of repeated monomer units called monosaccharides. Examples of monosaccharides include glucose, fructose, and galactose.

2. **Identifying the Bond Type**:
- The question asks how these monosaccharide units are linked together in a polysaccharide.
- The options provided are:
- Peptide bonds
- Glycosidic bonds
- Hydrogen bonds
- Phosphodiester bonds

3. **Analyzing Each Bond Type**:
- **Peptide Bonds**: These bonds link amino acids together to form proteins. Therefore, they are not relevant to polysaccharides.
- **Glycosidic Bonds**: These are the bonds that connect monosaccharides to form polysaccharides. For example, in starch, glucose units are linked by glycosidic bonds.
- **Hydrogen Bonds**: These are weak attractions that can occur between molecules, such as between nitrogenous bases in DNA, but they do not link monosaccharides in polysaccharides.
- **Phosphodiester Bonds**: These bonds link nucleotides in nucleic acids (like DNA and RNA) and are not involved in polysaccharide formation.

4. **Conclusion**:
- The correct answer is that polysaccharide monomers are linked by **glycosidic bonds**.

### Final Answer:
Polysaccharide monomers are linked by **glycosidic bonds**.

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