Which of the following represents uridylic acid ?

Options

A. Uracil + Ribose
B. Uridine + Phosphoric acid
C. Uracil + Phosphoric acid
D. Uridine + Ribose + Phosphoric acid

Answer

To determine which option represents uridylic acid, we need to understand the components that make up a nucleotide. A nucleotide consists of three main components:

1. A nitrogenous base
2. A sugar
3. A phosphate group

In the case of uridylic acid, we specifically look for:

- The nitrogenous base: Uracil
- The sugar: Ribose (a 5-carbon sugar)
- The phosphate group: Phosphoric acid

Now, let's analyze the given options:

A. Uracil plus ribose.
- This option includes the nitrogenous base (uracil) and the sugar (ribose), but it does not include the phosphate group. Thus, this is not uridylic acid.

B. Uridine plus phosphoric acid.
- Uridine is a nucleoside that consists of uracil and ribose. However, this option does not explicitly mention ribose, which is part of uridine. It also lacks the nitrogenous base as a separate component. Therefore, this is not the correct representation of uridylic acid.

C. Uracil plus phosphoric acid.
- This option includes the nitrogenous base (uracil) and the phosphate group, but it does not include the sugar (ribose). Hence, this is not uridylic acid.

D. Uracil plus ribose plus phosphoric acid.
- This option includes all three components: the nitrogenous base (uracil), the sugar (ribose), and the phosphate group (phosphoric acid). Therefore, this is the correct representation of uridylic acid.

Thus, the answer is **D. Uracil plus ribose plus phosphoric acid.**