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Two types of transport of molecules across a cell membrane are: Transport 1: Solute molecules move across the cell membrane along their concentration gradient; requires no energy expenditure. Transport 2: Solute molecules move across the cell membrane against their concentration gradient; requires expenditure of energy.

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Erudite1
In the question given above, transport 1 describes PASSIVE TRANSPORT while transport 2 describes ACTIVE TRANSPORT.
Passive transport are the simplest type of transport that take place at the cell membranes. It involves the movement of ions across a membrane without the need for energy. The types of passive transport that exist are diffusion, osmosis, facilitated diffusion and filtration.
Active transport involves the movement of substances across the cell membranes using energy. There are two basic types of active transport, these are primary and secondary active transport.

Answer:

A

Explanation:

Transport 1 describes passive transport by diffusion , this answer is coming directly from USAtestprep.  

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