Chapter 11. A Two-Na⁺/One-Glucose Symporter

Animation Activities

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Animation Activity 11-26: A Two-Na⁺/One-Glucose Symporter

1.

The two-Na⁺/one-glucose symporter moves Na⁺ ions and glucose:

in the same direction, both against their concentration gradients.

in opposite directions, both against their concentration gradients.

in the same direction, one with and one against its concentration gradient.

in opposite directions, one with and one against its concentration gradient.

in the same direction, both down their concentration gradients.

Correct.

Incorrect.

Try Again.

2.

This symporter takes on how many conformation states in terms of glucose/Na⁺ binding?

one

two

three

four

It does not change conformation.

Correct.

Incorrect.

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3.

Only in the ________ can the glucose and Na⁺ ions dissociate from the transporter to be released into the cytosol.

outward-facing conformation of the symporter

inward-facing concentration of the symporter

occluded conformation of the symporter

absence of glucose inside the cell

absence of Na⁺ inside the cell

Correct.

Incorrect.

Try Again.

4.

In the occluded conformation of the symporter, the ________ is/are transiently occluded and therefore unable to ________.

Na⁺ and glucose; dissociate from the symporter

Na⁺ only; move down its concentration gradient

glucose only; move against its concentration gradient

Na⁺ and glucose; bind to the symporter for transport

symporter itself; bind Na⁺ or glucose

Correct.

Incorrect.

Try Again.

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Chapter 11. A Two-Na⁺/One-Glucose Symporter

Introduction

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