Identify the correct pair of statements
(i) Alternate name of thymine is 5- methyl uracil
(ii) Arachidonic acid molecule contains less number of carbons than palmitic acid
(iii) Cellulose contains helices
(iv) Aquaporin is a polypeptide

Options

A. ii,iii
B. i,ii
C. ii,iv
D. i,iv.

Answer

To solve the question, we need to evaluate each of the given statements and determine which ones are correct. Let's analyze them step by step.

### Step 1: Evaluate Statement (i)
**Statement (i):** Alternate name of thymine is 5-methyl uracil.

- **Analysis:** Thymine is indeed known as 5-methyluracil because it is formed by adding a methyl group to uracil at the fifth carbon position. This statement is **correct**.

### Step 2: Evaluate Statement (ii)
**Statement (ii):** Arachidonic acid molecule contains less number of carbons than palmitic acid.

- **Analysis:** Palmitic acid has 16 carbon atoms, while arachidonic acid has 20 carbon atoms. Therefore, this statement is **incorrect**.

### Step 3: Evaluate Statement (iii)
**Statement (iii):** Cellulose contains helices.

- **Analysis:** Cellulose is a linear polysaccharide and does not have a helical structure; it forms straight chains that are non-branched. Thus, this statement is **incorrect**.

### Step 4: Evaluate Statement (iv)
**Statement (iv):** Aquaporin is a polypeptide.

- **Analysis:** Aquaporins are indeed proteins that facilitate the transport of water across cell membranes. Since proteins are made up of polypeptides (chains of amino acids), this statement is **correct**.

### Conclusion
After evaluating all the statements:
- Statement (i) is correct.
- Statement (ii) is incorrect.
- Statement (iii) is incorrect.
- Statement (iv) is correct.

Thus, the correct pair of statements is **(i) and (iv)**.

### Final Answer
The correct answer is: **(i) and (iv)**.

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