What initiates this cell to express the specific gene into mRNA?

an active transcription factor
a chemical signal that is specific to the receptor
any hormone released by the body
a phosphorylation cascade

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a. seed plant structure. 1. the three main plant organs are roots, stems, and leaves. a fourth kind of tissue, meristematic tissue, is responsible for plant growth. meristematic tissue is the only plant tissue that produces new cells by mitosis. plants can lose water out of their leaves as they exchange gases with the air

explanation: