Read the given statements.
(i) Fructose is the sweetest sugar.
(ii) Glycine is the simplest amino acid.
(iii) Lactose is a disaccharide composed of one molecule each of glucose and galactose.
(iv) Cellulose is an unbranched chain of glucose molecules linked by `beta-1`, 4-glycosidic bond.
Which of the given statements are correct ?

Options

A. (i) and (ii)
B. (iii) and (iv)
C. (i), (ii) and (iii)
D. (i),(ii),(iii) and (iv)

Answer

To determine which of the given statements are correct, let's analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement (i): Fructose is the sweetest sugar.**
- Fructose is indeed known as the sweetest naturally occurring sugar. It is a monosaccharide found in many fruits and is sweeter than glucose and sucrose.
- **Conclusion:** This statement is correct.

2. **Statement (ii): Glycine is the simplest amino acid.**
- Glycine is the simplest amino acid, characterized by having a hydrogen atom as its side chain (R group). This makes it the smallest amino acid, as it has no additional carbon atoms in its side chain.
- **Conclusion:** This statement is correct.

3. **Statement (iii): Lactose is a disaccharide composed of one molecule each of glucose and galactose.**
- Lactose is indeed a disaccharide formed by the combination of one glucose molecule and one galactose molecule. It is commonly known as milk sugar.
- **Conclusion:** This statement is correct.

4. **Statement (iv): Cellulose is an unbranched chain of glucose molecules linked by beta-1,4-glycosidic bond.**
- Cellulose is a polysaccharide made up of glucose units linked by beta-1,4-glycosidic bonds. It forms long, unbranched chains that provide structural support in plant cell walls.
- **Conclusion:** This statement is correct.

### Final Conclusion:
All four statements are correct.