Question

Nonprotein amino acids produced by plants: Select all that apply.

		are not used by plants in protein synthesis
		interfere with protein synthesis in herbivores
		are plant amino acids not incorporated into animal protein
		are used to produce nitrogen-rich chemical defenses such as alkaloids

Answer 1

20 standard amino acids are used in the protein, nonprotein amino acids like ornithine, citrulline is not used in the protein. some non-protein amino acids like canavanine are secondary metabolites, the enzymes in the herbivores can recognize these amino acids so it does no cause toxicity to them. so the answers are

are not used by plants in protein synthesis

are plant amino acids not incorporated into animal protein

are used to produce nitrogen-rich chemical defenses such as alkaloids