The rate of diffusion of molecules would be fastest in a cell with an

Question

A.  internal concentration of 45 percent and an external concentration of 50 percent in cold temperatures.
B.  internal concentration of 50 percent and an external concentration of 12 percent in cold temperatures.
C.  internal concentration of 50 percent and an external concentration of 12 percent in warm temperatures.
D.  internal concentration of 40 percent and an external concentration of 35 percent in warm temperatures.

Clarify Question
· What is the key concept addressed by the question?
· What type of thinking is required?

Gather Content
· What do you know about factors that affect the rate of diffusion? What other information is related to the question?

Choose Answer
· Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer?
 
Reflect on Process
· Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?

Answer 1

C.  internal concentration of 50 percent and an external concentration of 12 percent in warm temperatures.

Clarify Question
· What is the key concept addressed by the question?
        o The question asks about factors that affect the rate of diffusion.
· What type of thinking is required?
        o You are being asked to apply your knowledge about factors that affect the rate of diffusion.

Gather Content
· What do you know about factors that affect the rate of diffusion? What other information is related to the question?
        o Diffusion relies on the rapid movement of molecules.  This occurs most rapidly in warmer temperatures when the molecules are moving faster. The greater the difference in concentration across a membrane, the larger the gradient and the faster molecules will diffuse.

Choose Answer
· Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer?
        o The answer in which the internal concentration of 50 percent and an external concentration of 12 percent in warm temperatures would have the fastest diffusion. The warm temperatures and large gradient would both make diffusion faster in these conditions.
 
Reflect on Process
· Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
        o This question asked you to apply your knowledge about factors that affect the rate of diffusion. If you got the correct answer, great job! If you got an incorrect answer, where did the process break down? Did you think that molecules diffuse most rapidly in the cold? Did you think that molecules diffuse most rapidly down smaller gradients?