Question

Select the correct answer from the following:

• A. ABA is not a terpenoid derivative
• B. No plant hormone is translocated to other plant parts for growth.
• C. Ethylene is derived from methionine
• D. Kinetin is a modified pyrimidine

Answer 1

Answer:

C. Ethylene is derived from methionine

• Ethylene is synthesized from methionine through the intermediates S-adenosyl methionine (SAM) and the cyclic amino acid 1-aminocyclopropane-1-carboxylic acid (ACC).

• The enzyme converting methionine to SAM is SAM synthetase, ACC synthase converts SAM to ACC and ACC is oxidized to ethylene by ACC oxidase.