A symporter is moving glucose and sodium levels are being depleted in extracellular fluids. What can be concluded about the movement of glucose? Choose all that apply.

Question

_____  Glucose would be moving against its gradient into the cell
_____  Glucose follows the gradient of sodium into the cell
_____  Glucose would be moving with its gradient into the cell
_____  ATP is not required to move sodium down its concentration gradient
_____  Energy is needed to move glucose down its concentration gradient
_____  Glucose's movement would still be considered diffusion
_____  Glucose's movement is considered a part of coupled transport

Clarify Question
· What is the key concept addressed by the question?
· What type of thinking is required?
 
Gather Content
· What do you know about coupled transport of glucose and sodium? 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

__X__  Glucose would be moving against its gradient into the cell
__X__  Glucose follows the gradient of sodium into the cell
_____  Glucose would be moving with its gradient into the cell
__X__  ATP is not required to move sodium down its concentration gradient
__X__  Energy is needed to move glucose down its concentration gradient
_____  Glucose's movement would still be considered diffusion
__X__  Glucose's movement is considered a part of coupled transport

Clarify Question
· What is the key concept addressed by the question?
        o The question asks about coupled transport of glucose and sodium.
· What type of thinking is required?
        o You are being asked to analyze statements about coupled transport of glucose and sodium.
 
Gather Content
· What do you know about coupled transport of glucose and sodium? What other information is related to the question?   
        o The active glucose transporter uses the Na+ gradient produced by the Na+/K+ pump as a source of energy to power the movement of glucose into the cell. In this system, both glucose and Na+ bind to the transport protein, which allows Na+ to pass into the cell down its concentration gradient, capturing the energy and using it to move glucose into the cell through a symporter.
 
Choose Answer
· Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer?
        o Na+ moves down its concentration gradient, moving glucose against its concentration gradient through coupled transport. The movement of Na+ ions down its gradient is a form of energy, so glucose is being moved by a form of active transport.
  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 analyze statements about coupled transport of glucose and sodium. If you got the correct answer, great job! If you got an incorrect answer, where did the process break down? Did you think that sodium and glucose were transported by an antiporter? Did you think that glucose transport was not linked to Na+ transport?