A) are fine channels across the cell wall that link the plasma membranes and cytosols of adjacent plant cells. B) connect and support the cell walls of adjacent plant cells through networks of cytoskeletal elements. C) are integrin protein links similar to tight junctions in animal cells, which maintain the correct location of different membrane proteins. D) are transmembrane protein channels that connect adjacent plant cells and allow ions to cross freely between them. E) link cell walls to form tight barriers that prevent the free movement of molecules through the interstitial spaces between plant cells. A) are fine channels across the cell wall that link the plasma membranes and cytosols of adjacent plant cells. B) connect and support the cell walls of adjacent plant cells through networks of cytoskeletal elements. C) are integrin protein links similar to tight junctions in animal cells, which maintain the correct location of different membrane proteins. D) are transmembrane protein channels that connect adjacent plant cells and allow ions to cross freely between them. E) link cell walls to form tight barriers that prevent the free movement of molecules through the interstitial spaces between plant cells.

A) are complex polysaccharides that contribute to the hydration and porosity of the extracellular matrix. B) are composed of repeating disaccharide units with a strong positive charge that attracts water and so provides cushioning against external forces. C) are adhesive proteins that anchor cells to fibres within the extracellular matrix. D) are structural proteins that allow the extracellular matrix to stretch and rebound without damage. E) combine with structural proteins to form cross-linked fibres that allow the extracellular matrix to resist tension. A) are complex polysaccharides that contribute to the hydration and porosity of the extracellular matrix. B) are composed of repeating disaccharide units with a strong positive charge that attracts water and so provides cushioning against external forces. C) are adhesive proteins that anchor cells to fibres within the extracellular matrix. D) are structural proteins that allow the extracellular matrix to stretch and rebound without damage. E) combine with structural proteins to form cross-linked fibres that allow the extracellular matrix to resist tension.

A) adherens junctions connecting the actin cytoskeletons of two adjacent cells. B) adherens junctions providing mechanical support through the interaction of laminin fibres. C) occluding junctions that prevent the movement of molecules through the spaces between cells. D) anchoring junctions that connect the actin cytoskeleton of cells to the extracellular matrix. E) communication junctions that form open channels between adjacent cells. A) adherens junctions connecting the actin cytoskeletons of two adjacent cells. B) adherens junctions providing mechanical support through the interaction of laminin fibres. C) occluding junctions that prevent the movement of molecules through the spaces between cells. D) anchoring junctions that connect the actin cytoskeleton of cells to the extracellular matrix. E) communication junctions that form open channels between adjacent cells.