Question

multiple choice 10 points a scientist is studying the coordinated contraction of heart muscle cells in an animal and the rapid transport of water and nutrients between plant cells in a leaf. which of the following correctly identifies the cell junctions responsible for these functions? plasmodesmata in both heart muscle cells and leaf cells create a watertight seal to prevent fluid leakage. tight junctions in both heart muscle cells and leaf cells allow for the rapid passage of ions and solutes. tight junctions in heart muscle cells and plasmodesmata in leaf cells provide strong adhesion to prevent cells from being pulled apart. gap junctions in heart muscle cells and plasmodesmata in leaf cells allow for the direct exchange of small molecules and ions. clear my selection

Explanation:

Gap junctions in animal cells, like those in heart - muscle cells, allow for the rapid passage of ions and small molecules, enabling coordinated contraction. Plasmodesmata are channels in plant cells that allow for the direct exchange of small molecules and ions, facilitating the transport of water and nutrients between plant cells in a leaf. Tight junctions create a watertight seal, and are not relevant here for the functions described.

Answer:

D. Gap junctions in heart muscle cells and plasmodesmata in leaf cells allow for the direct exchange of small molecules and ions.