In antiport,

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.

Movement and accumulation of ions across a membrane against their concentration gradient can be explained by

Which of the following transport induces conformational changes in proteins?

Uphill transport is a type of

Diffusion occurring along the concentration gradient and mediated by carrier molecules is known as: