Which statement about the enzymes ALS and EPSP is false?

Study for the Florida Aquatic Weed Control Pesticide Exam. Use flashcards and multiple-choice questions, each with hints and explanations. Prepare effectively!

The statement regarding the enzymes ALS (acetolactate synthase) and EPSP (5-enolpyruvylshikimate-3-phosphate synthase) being found in both plants and animals is false. These enzymes are integral to specific biosynthetic pathways that are predominantly present in plants and some microorganisms but not in animals.

ALS is part of the branched-chain amino acid biosynthesis pathway, while EPSP is involved in the shikimic acid pathway, which is critical for the synthesis of aromatic amino acids. Since animals do not possess these pathways, they do not produce these enzymes, which makes the assertion about their presence in animals incorrect.

The other statements accurately reflect the roles and effects of these enzymes. They both regulate the production of essential amino acids in plants, and their inhibition by glyphosate (which targets EPSP) and penoxsulam (which targets ALS) disrupts protein production in plants. When these herbicides inhibit their respective enzymes, affected plants cannot synthesize essential amino acids, ultimately impairing protein production and leading to plant death.

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