Question

AUG codes for

• A. Valine
• B. Histidine
• C. Phenylalanine
• D. Methionine

Answer 1

The correct option is D

Methionine

The correct option is D.

Explanation of correct option:

1. Methionine is coded as AUG.
2. It is also the start codon.
3. It initiates protein synthesis.
4. During protein synthesis, methionine is the first amino acid to dock in the ribosome.

Explanation of incorrect options:

Option A:

1. Valine is an amino acid.
2. It is used in protein biosynthesis.
3. It is essential in humans and must be obtained through diet.
4. The codon for valine is GUG.

Option B:

1. Histidine is a -amino acid with the symbol "His"
2. It is encoded by condoms, CAC, and CAU.
3. They have a positive charge.
4. It is one of the important amino acids.
5. It is present in the foods such as fish, meat, and eggs.

Option C:

1. The aromatic amino acid phenylalanine L-phenylalanine is the only form of phenylalanine.
2. It is found in proteins.
3. It is an essential amino acid.

Final answer: AUG codes for methionine.