Read the following statements and find out the incorrect statement.

Options

A. Oil have lower melting point (e.g. gingely oil) and hence remain as oil in winters
B. Adenosine, guanosine, cytosine, uridine and thymidine are nucleosides
C. Adenylic acid, deoxy thymidylic acid, guanylic acid uridylic acid and cytidylic acid are nucleotides
D. Nucleic acids like DNA and RNA consists of nucleotides only

Answer

To solve the question of identifying the incorrect statement from the provided options, we can follow these steps:

### Step-by-Step Solution:

1. **Analyze the First Statement:**
- The first statement claims that oils have a lower melting point, which allows them to remain in liquid form during winter. This is true because oils typically have melting points lower than room temperature, which keeps them liquid.

2. **Analyze the Second Statement:**
- The second statement lists adenosine, guanosine, cytosine, uridine, and thymidine as nucleosides. Here, we need to clarify the definitions:
- Nucleosides are composed of a nucleobase and a sugar.
- Adenosine and guanosine are indeed nucleosides, but cytosine, uridine, and thymidine are actually nucleobases (specifically, they are part of the pyrimidine group). Therefore, this statement is incorrect.

3. **Analyze the Third Statement:**
- The third statement mentions adenylic acid, deoxythymidylic acid, guanylic acid, uridylate, and cytidylate as nucleotides. This is correct because these compounds consist of nucleosides (adenosine, thymidine, guanosine, uridine, and cytidine) with a phosphate group attached.

4. **Analyze the Fourth Statement:**
- The fourth statement states that nucleic acids like DNA and RNA consist of nucleotides only. This is also true, as DNA and RNA are polymers made up of nucleotide units.

5. **Conclusion:**
- After analyzing all statements, the second statement is the only incorrect one as it misclassifies cytosine, uridine, and thymidine as nucleosides instead of nucleobases.

### Final Answer:
The incorrect statement is the **second statement**: "adenosine, guanosine, cytosine, uridine, and thymidine are nucleosides."

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