Exam 4: Cell Membranes, Transport, and Communication

Plasmodesmata are not found in animal cells.

Water moves across a membrane from a hypotonic solution to a ________ solution.

Channel proteins require energy for transporting molecules across the plasma membrane.

Which of the following signaling molecules would NOT be found in animals?

You place some Elodea,an aquarium plant,in a hypotonic solution.What happens?

After entering its target cell,a hydrophobic hormone binds to its intracellular receptor and then interacts with the cell's DNA,resulting in the production of a specific ________.

In the following flowchart summarizing membrane transport,both active and facilitated transports terminate at separate carrier proteins.Which statement explains why the lines do not converge at the same carrier protein?

The various connections between cells,including cell junctions and signaling molecules,allow the cells in a multicellular organism to "talk" to each other,a principle known as cell-to-cell ________.

Some hormones,like thyroxine,affect most or all body cells,while others only affect a single organ or type of cell.This is because of variations in