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Biology Review Puzzle

Across
Information carrying molecules secreted by cells into bodily fluids and act on distant target cells.
Consists of a single long DNA strand wrapped around proteins called histones
Area where microtubules attach to chromosome
The first stage of mitosis
Leads to the production of sperm and eggs
Different versions of the same gene
Down
Connect the cytoskeletons of cells
Observable trait
X-shaped structure formed in prophase of meiosis
Interconnected stacks of thylakoids