According to the chemiosmotic theory, an electrochemical proton gradient is used to synthesize ATP in mitochondria. The enzyme that does this is located on the inside of the mitochondrial membrane. The oxidation of carbohydrates and fats is used to pump protons outside the mitochondrial membrane until the steady-state membrane potential is -140 mV and the pH gradient âpH = 1.5. Inside the mitochondrion, pH = 7.0, [ATP] = 1 mM, [Pi] = 2.5 mM, [ADP] = 1 mM, and T = 298 K.
a) Howw much chemical potential is required to synthesize ATP inside mitochondria? Hint: here the question refers to the chemical potential difference between products and reactants = âG of the reaction ADP + Pi -> ATP.
b) How much free energy is made available by moving 1 mol of protons from the outside to the inside? Is this enough to drive ATP synthesis?
c) How many protons must be translocated per ATP synthesized?
According to the chemiosmotic theory, an electrochemical proton gradient is used to synthesize ATP in mitochondria. The enzyme that does this is located on the inside of the mitochondrial membrane. The oxidation of carbohydrates and fats is used to pump protons outside the mitochondrial membrane until the steady-state membrane potential is -140 mV and the pH gradient âpH = 1.5. Inside the mitochondrion, pH = 7.0, [ATP] = 1 mM, [Pi] = 2.5 mM, [ADP] = 1 mM, and T = 298 K.
a) Howw much chemical potential is required to synthesize ATP inside mitochondria? Hint: here the question refers to the chemical potential difference between products and reactants = âG of the reaction ADP + Pi -> ATP.
b) How much free energy is made available by moving 1 mol of protons from the outside to the inside? Is this enough to drive ATP synthesis?
c) How many protons must be translocated per ATP synthesized?
For unlimited access to Homework Help, a Homework+ subscription is required.
Related textbook solutions
Related questions
alkalosis homeostasis cryogenesis |
carbohydrates lipids nucleic acids |
water is adhesive water istransparent water expands when itfreezes |
reaction initiation activation |
cytoplasm mitochondria nucleus |
oxygen and sugars proteins and sugars carbon dioxide andoxygen |
pigments, products products, reactants elements, atoms |
ATP starch glycogen |
fats steroids amino acids |
Kreb's cycle acetyl-CoAformation electron transportchain |
fermentation the Kreb cycle the electron transportchain |
Cool the reactants. Decrease the pH. Add an enzyme(catalyst). |
nucleus mitochondria a cell membrane |
cell walls chromosomes mitochondria |
osmosis active transport passive transport |
ribosome mitochondrion cytoskeleton |
diffusion active transport passive transport |
lipids proteins carbohydrates |
neither take up water orlose water take up water andswell transport water into thecell by active transport. |
lipid storage DNA replication photosynthesis |
chromosome movementduring mitosis protein synthesis ATP production |
metaphase anaphase telophase |
metaphase anaphase telophase |
metaphase anaphase telophase |
Synthesis phase (S) G1 cytokinesis |
4 daughter cells, 5chromosomes each 2 daughter cells, 10chromosomes each 2 daughter cells, 5chromosomes each |
10 20 Not enough informationprovided |
the number of chromosomesallotted to each daughter cell must be halved sister chromatids must beseparated into different daughter cells it produces new arrays ofalleles on chromosomes and contributes to genetic diversity |
are in Interphase are in metaphase are undergoingMeiosis |
twice as many chromosomesas the original cell an independent assortmentof the original cell's chromosomes an identical copy of theoriginal cell's chromosome. |
A-C-A-G-C-C-G-T-A T-G-T-C-G-G-C-A-T U-G-U-C-G-G-C-A-U |