Biochemistry
Biochemistry
9th Edition
ISBN: 9781319114671
Author: Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher: W. H. Freeman
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Chapter 13, Problem 2P
Interpretation Introduction

Interpretation:

The two forms of energy that can power active transport needs to be determined.

Concept introduction:

In the powering movement, there are two forms of energy which can power active transport. Moving of molecules from lower to higher concentration region across the membrane is the active transport which needs the energy of the cell to carry the active transport. Intestines normally take up the glucose which is an example of active transport.

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Fo-F1 ATPase. The energy for ATP synthesis from ADP and Pi is provided by the downhill transport of protons through the rotary FoF1 ATP synthase (lecture 22).   The enzyme has 3 a-b and 12 ‘c’ subunits. The mitochondrion maintains Df=180 mV (negative inside), pHin = 8, pHout=7, [Pi] = 3 mM and ADP is present as well. How much energy is available (from the proton electrochemical gradient) for ATP synthesis under these conditions (in kJ/mol)?                                                                                                                  What [ATP]/[ADP] ratio will be established at steady-state under these conditions?                                                                                                                                                What would be the [ATP]/[ADP] ratio if the enzyme had only 9 ‘c’ subunits? Remember that full revolution of the crank (gamma subunit) produces 3 ATP.
gradient. This must be (21)_ to "pump" the potassium ions into the cell. transport; the cell expends (22)_ to provide energy Suddenly there is a tug at your foot. You look down to see your flipper engulfed by a rippling membrane. A leukocyte the size of a building quickly holds you against the wall of the blood vessel. The phospholipids of its cell membrane are pressed against your face mask. The cell is engulfing you, protecting the body from a foreign invader! Taking in a substance in this way is called (23) more specifically (24) diminishes, and you are inside the leukocyte, floating free in a membrane (25) if the substance is a solid particle. Suddenly the pressure enclosed bag, or Another sac is approaching; it is a (26) full of digestive enzymes. You manage to get your legs outside of the vacuole and move it back toward the inner surface of the cell membrane, As the vacuole joins with the cell membrane, you pull your feet freely and you glide away from the impatient cell,…
No free lunch. Explain why maintaining a high concentration of CO2 CO2 in the bundle-sheath cells of C4C4 plants is an example of active transport. How much ATP is required per CO2CO2 to maintain a high concentration of CO2CO2 in the bundle-sheath cells of C4C4 plants?
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