Which of the following statements are correct regarding amino acids?

A. They are substituted methanes.
B. Serine is an aromatic amino acid.
C. Valine is a neutral amino acid.
D. Lysine is an acidic amino acid.

Choose the correct answer from the options given below:

Question

Which of the following statements are correct regarding amino acids?

A. They are substituted methanes.
B. Serine is an aromatic amino acid.
C. Valine is a neutral amino acid.
D. Lysine is an acidic amino acid.

Choose the correct answer from the options given below:

Accepted Answer

C. 1. To solve this, we need to recall the general structure of amino acids and how individual amino acids are classified.

2. **Statement A** says amino acids are substituted methanes. Since every amino acid has a central carbon (like methane's carbon) attached to an amino group, a carboxyl group, a hydrogen, and a variable R group, this description is **correct**.

3. **Statement B** claims serine is an aromatic amino acid, but serine actually carries a hydroxyl (-OH) group on its R group, which makes it an **alcoholic amino acid**, not an aromatic one, so this statement is **incorrect**.

4. **Statement C** says valine is a neutral amino acid. Since valine's R group is a simple non-polar hydrocarbon branch with no acidic or basic character, it is correctly classified as **neutral**, so this statement is **correct**.

5. **Statement D** claims lysine is acidic, but lysine has an extra amino group in its side chain, giving it basic character, so lysine is actually a **basic amino acid**, making this statement **incorrect**.

6. Since only statements A and C are correct, the answer matches **option C**.

Hence, the answer is **C**.

Which of the following statements are correct regarding amino acids? A. They are substituted methanes. B. Serine is an aromatic amino acid. C. Valine is a neutral amino acid. D. Lysine is an acidic amino acid. Choose the correct answer from the options given below:

Which of the following statements are correct regarding amino acids?

A. They are substituted methanes. B. Serine is an aromatic amino acid. C. Valine is a neutral amino acid. D. Lysine is an acidic amino acid.

Choose the correct answer from the options given below: