Answer :
Answer:
Active transport
Explanation:
Because it use energy to transport from lower concentration to higher concentration.
Answer: Active transport
Explanation: There are two main ways to transporting molecules between different environments. Molecules are either transported down the concentration gradient (from high to low concentration) or up the concentration gradient. (from low to high concentration.)
Transport methods that move molecules down the concentration gradient are known as passive transport, and don't require energy to occur. On the other hand transport methods that move molecules up the concentration gradient are known as active transport, and usually require energy to be expended in order to occur.
Osmosis is a type of passive transport that is unique to water molecules. Though water molecules normally have a difficult time diffusing through the cell membrane because of their polar nature, specially designed membrane proteins known as aquaporins allow water molecules to diffuse from high to low water concentration. Since this process requires no chemical energy and transports molecules down the concentration gradient, it is not the answer to the question.
Diffusion (and by extent, facilitated diffusion) is also a form of passive transport that involves moving molecules down the concentration gradient without the use of energy. The only difference between diffusion and facilitated diffusion is that normal diffusion involves molecular movement across the cell membrane, while facilitated diffusion involves molecular movement across channel proteins in the cell membrane. Since neither of these transport methods require energy, neither of these answer choices are correct.
In conclusion, all of the other answer choices mention types of passive transport, which move molecules down the concentration gradient without expending energy. Thus, the only answer choice that fits the description of a transport type that uses protein channels and energy to move molecules up the concentration gradient is active transport.
