Blocking the proton pumps in a root would result in a more negative membrane potential and an increase in K+ uptake.

Question

Answer the following statement true (T) or false (F)

Answer 1

False

Clarify Question
• What is the key concept addressed by the question?
        o This question is asking about the far-reaching effects of proton pumps in the roots of a plant.
• What type of thinking is required?
        o You are being asked to take what you already know and apply it to the nature of proton pumps I a plant root.
• What key words does the question contain and what do they mean?
        o Proton pump, which moves materials such as ions from one location to another.
        o Membrane potential, which refers to a charge differential across a membrane.

Gather Content
• What do you already know about the effects of proton pumps in plant root cells? How does it relate to the question?
        o Proton pumps move H+ out of a plant.
        o This makes it easier for the plant to move positively charged ions into the plant.
        o Proton pumps move K+ into a plant.

Consider Possibilities
• What other information is related to the question? Which information is most useful?
        o If proton pumps were blocked, the H+would not leave the plant. This additional positive charge would make it more difficult to move more positively charged ions in.

Choose Answer
• Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer?
       o Since proton pumps move ions in a way that promotes the entry of K+, if they were blocked, K+ would not enter the plant.

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?
• Apply level:
       This question asked you to connect the function of proton pumps with the entry of K+. Answering this question correctly depended on your ability to use result of the action of proton pumps in a new situation. If you got the correct answer, great job! If you got an incorrect answer, where did the process break down? Did you remember that proton pumps move ions in such a way that K+ entry is facilitated? Did you have trouble extending the role of proton pumps to determine the correct answer?