Arrange the following in ascending order based upon their molecular weights
A) Nucleotide
B) Phosphate
C) Nucleoside
D) Sugar

Options

A. A - B - C -D
B. A - C - D - B
C. B - D - C - A
D. A- C- B -D

Answer

To arrange the given biomolecules in ascending order based on their molecular weights, we need to analyze each component:

1. **Phosphate (B)**: Phosphate groups are relatively small molecules. They consist of a phosphorus atom bonded to four oxygen atoms, which gives them a low molecular weight compared to the other options.

2. **Sugar (D)**: Sugars, such as ribose or deoxyribose, are larger than phosphates. They typically consist of several carbon, hydrogen, and oxygen atoms, which increases their molecular weight.

3. **Nucleoside (C)**: A nucleoside is formed by combining a sugar with a nitrogenous base (adenine, guanine, cytosine, or thymine/uracil). The addition of the nitrogenous base increases the molecular weight compared to just the sugar.

4. **Nucleotide (A)**: A nucleotide consists of a nucleoside plus a phosphate group. Since it includes both the sugar and nitrogenous base from the nucleoside, along with the phosphate, it has the highest molecular weight among the options.

Now, we can arrange them in ascending order based on their molecular weights:

1. **Phosphate (B)** - lowest molecular weight
2. **Sugar (D)**
3. **Nucleoside (C)**
4. **Nucleotide (A)** - highest molecular weight

Thus, the correct order is: **B < D < C < A**.

### Final Answer:
B (Phosphate) < D (Sugar) < C (Nucleoside) < A (Nucleotide)