Define the following terms:
$(1)$ Antiport
$(2)$ Active transport

Read carefully the following statements and choose the right answer from the options given below.
$I$. Diffusion is a slow process and it does not depend upon the living system.
$II$. Usually,the process of diffusion does not need energy.
$III$. Diffusion can occur from one part of a cell to another part of the same cell,or from one cell to another,and from one tissue to another tissue.
$IV$. Diffusion is a rapid process over short distances,but extremely slow over long distances.

Active transport of ions by the cell requires

Active transport differs from passive transport in that active transport

As cells in the cortex are loosely packed,what is the effect on water movement?

According to the well-known theory of transport of solutes across a cell membrane,what happens when sugar is passed through it?