Transport mechanisms are defined by how solutes move relative to a concentration

Question

Transport mechanisms are defined by how solutes move relative to a concentration gradient. (i.e., high to low, low to high). Examine model 1 and answer the following: In passive transport, how does the direction of solute movement align with the concentration gradient? In active transport, how does the direction of solute movement align with the concentration gradient ? Molecules are often described as moving UP or DOWN the concentration gradient. Fill-in the blanks: Passive transport moves solute _________ a concentration gradient, and active transport moves solutes _______ a concentration gradient. Cells use energy in the form of ATP to do work. Which transport process(es) use AT P? As a group, write a complete sentence to explain why. Diffusion is the random movement of molecules until equilibrium is reached. Examine Model 1 and then answer the following questions: Is diffusion a form of active or passive transport? Explain your answer. What two types of diffusion are shown in the Model? Which process(es) involve transport directly through the phospholipid membrane? Which process(es) require protein channel/carrier for transport?

Explanation / Answer

2. molecules move down the concentration gradient (from higher concentration to lower concentration in passive transport, and molecules move against the concentration gradient in Active Transport.

3.Down, UP .

4.Active transport uses ATP to pump molecules against a concentration gradient.

Diffusion is a Passive Transport. In Diffusion molecules move based on the concentration gradient.

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