Question

The Na+/I- symporter is a secondary active transporter (see figure) in thyroid tissue that functions to transport iodine ions (squares) up a concentration gradient from outside to the inside. Na+ ions (circles) are transported down a concentration gradient from outside to inside through the Na+/I- symporter. Steady state concentrations are [iodine]outside = 10 mM, [iodine]inside = 150 mM, [Na+]outside = 200 mM, and [Na+]inside = 5 mM. The membrane potential is 70 mV (negative inside). a) What is the delta G for transporting two moles of Na+ ions into thyroid cells at 37 °C? b) What is the deltaG for transporting one mole of iodine ion into thyroid cells at 37 °C? c) What is the deltaG for the overall process of transporting two moles of Na+ ions and one mole of iodine ion into thyroid cells at 37 °C?

          The Na+/I- symporter is a secondary active transporter (see figure) in thyroid tissue that functions to transport iodine ions (squares) up a concentration gradient from outside to the inside. Na+ ions (circles) are transported down a concentration gradient from outside to inside through the Na+/I- symporter. Steady state concentrations are [iodine]outside = 10 mM, [iodine]inside = 150 mM, [Na+]outside = 200 mM, and [Na+]inside = 5 mM. The membrane potential is 70 mV (negative inside).

a) What is the delta G for transporting two moles of Na+ ions into thyroid cells at 37 °C?

b) What is the deltaG for transporting one mole of iodine ion into thyroid cells at 37 °C?

c) What is the deltaG for the overall process of transporting two moles of Na+ ions and one mole of iodine ion into thyroid cells at 37 °C?

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the nai symporter is a secondary active transporter see figure in thyroid tissue that functions to transport iodine ions squares up a concentration gradient from outside to the inside na ion 71993

Added by Anita M.

Biology for AP Courses

Julianne Zedalis, John Eggebrecht

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Solved by Expert Shaiju T

04/14/2022

Step 1

314 J/mol·K) - T is the temperature in Kelvin (37 °C = 310 K) - [Na+]in and [Na+]out are the concentrations inside and outside the cell, respectively - Z is the charge of the ion (+1 for Na+) - F is Faraday's constant (96485 C/mol) - ΔΨ is the membrane potential Show more…

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The Na+/I- symporter is a secondary active transporter (see figure) in thyroid tissue that functions to transport iodine ions (squares) up a concentration gradient from outside to the inside. Na+ ions (circles) are transported down a concentration gradient from outside to inside through the Na+/I- symporter. Steady state concentrations are [iodine]outside = 10 mM, [iodine]inside = 150 mM, [Na+]outside = 200 mM, and [Na+]inside = 5 mM. The membrane potential is 70 mV (negative inside). a) What is the delta G for transporting two moles of Na+ ions into thyroid cells at 37 °C? b) What is the deltaG for transporting one mole of iodine ion into thyroid cells at 37 °C? c) What is the deltaG for the overall process of transporting two moles of Na+ ions and one mole of iodine ion into thyroid cells at 37 °C?

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Transcript

00:01 Hello students.

00:03 In the given question we have secondary active transport.

00:25 Iodine is passed using sodium iodide transporter to the thyroid gland.

00:52 Two sodium ions co -transport.

01:05 Two sodium ions co -transport.

01:09 One iodide ions.

01:11 That is two sodium ions transport one iodide.

01:14 And we find this in celery glands not only in thyroid gland, kidneys, gastric mucous and mammary glands.

01:40 Here also uptake of iodide is seen.

01:58 The keynote here is how active transport of iodide occurs in the cells and how the cells are going to get energy to perform this function that is active transport of iodide.

02:27 Let us consider the one word answer for this as asked in the given question.

02:35 So what is responsible for active transport? the answer here is active transport occurs by or it is mediated by sodium potassium atp pase.

03:06 Let us move to the second question.

03:09 This is a .tase.

03:09 We are going to the which type of transport it is symport.

03:15 It is a type of simporter that helps in transport, that is active transport.

03:23 Sodium iodide simporter is involved in this transport.

03:31 Sodium iodide simporter actively...

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