In .......... both molecules cross the membrane in the same direction.

In which movement, transport molecules are necessary but energy is not utilized?

In the light of the carrier concept,the transport of ions across the membrane is:

Which of the following processes shows uphill transport?

What are the aquaporins in the facilitated diffusion process?

Choose the correct sentences for diffusion:
$(1)$ In diffusion,molecules move in a random fashion.
$(2)$ Diffusion rates are affected by the gradient of concentration.
$(3)$ Diffusion is a slow process and is dependent on a 'living system'.
$(4)$ Movement by diffusion is passive.