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Based on Figure $7.18,$ which of these experimental treatments would increase the rate of sucrose transport into a plant cell? \begin{equation}\begin{array}{l}{\text { (A) decreasing extracellular sucrose concentration }} \\ {\text { (B) decreasing extracellular } \mathrm{pH}} \\ {\text { (C) decreasing cytoplasmic pH }} \\ {\text { (D) adding a substance that makes the membrane more }} \\ {\text { permeable to hydrogen tons }}\end{array}\end{equation}

          
            Based on Figure $7.18,$ which of these experimental treatments
would increase the rate of sucrose transport into a plant cell?
\begin{equation}\begin{array}{l}{\text { (A) decreasing extracellular sucrose concentration }} \\ {\text { (B) decreasing extracellular } \mathrm{pH}} \\ {\text { (C) decreasing cytoplasmic pH }} \\ {\text { (D) adding a substance that makes the membrane more }} \\ {\text { permeable to hydrogen tons }}\end{array}\end{equation}

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Added by Steven C.

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(A) Decreasing extracellular sucrose concentration would not increase the rate of sucrose transport into the cell. In fact, it would likely decrease the rate because there would be less sucrose available to be transported. (B) Decreasing extracellular pH means Show more…

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Transcript

00:01 Okay, now i'm going to say this question about cell transport, okay? so according to this picture here in the, in here that you can see here, you have here as importer.

00:10 Okay, this is important because you're moving both substances, sucrose and ions in the same direction.

00:17 Okay, for example, sucrose is moved only when these hydrogen ions are present.

00:22 Okay, so and well, here you have another proton pump that is going to move hydrogen ions outside.

00:29 So it is a simple transporter that it is going to move these hydrogen ions up the concentration gradient.

00:37 Why? well, because it is using atp, it is a pump and even more than a pump that uses atp, moves a substance up the concentration gradient.

00:46 It means from high concentrations or i'm sorry for low, from low concentrations to high concentration.

00:53 So the question says, based on the figure, which of these experimental treatments would increase the grade of glucose? sucrose transport into a plant cell.

01:01 Well, so practically, in order to move more sucrose, we have to move more hydrogen ions too.

01:07 And when are we going to move more hydrogen ions? well, remember that this is as importer, so it is going to move a substance down the concentration gradient.

01:16 So we're going to move more hydrogen ions when the levels of hydrogen ions are higher here and the levels of hydrogen ions are lower here.

01:31 Okay.

01:33 Remember that when you have high levels of hydrogen ions, you are going to have a low ph.

01:37 And when you have low levels of hydrogen ions, you're going to have a high ph...