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Does chemiosmosis use active transport


Nov 30, 2023

Is chemiosmosis passive transport?

Passive transport is coupled to the synthesis of ATP during chemiosmosis! Protein Complex V (ATP Synthase) couples the passive flow of H+ back into the inner matrix to the formation of ATP. This process can be likened to a water wheel at an old time mill.

Is chemiosmosis facilitated diffusion?

Chemiosmosis in mitochondria

As in chloroplasts, the energy released as these protons flow down their gradient is harnessed to the synthesis of ATP. The process is called chemiosmosis and is an example of facilitated diffusion.

What type of movement is used during chemiosmosis?

Chemiosmosis is when ions move by diffusion across a semi-permeable membrane, such as the membrane inside mitochondria. Ions are molecules with a net electric charge, such as Na+, Cl, or specifically in chemiosmosis that generates energy, H+.

How does chemiosmosis work?

Chemiosmosis involves the pumping of protons through special channels in the membranes of mitochondria from the inner to the outer compartment. The pumping establishes a proton (H+) gradient. After the gradient is established, protons diffuse down the gradient through a transport protein called ATP synthase.

Which of the following process is driven by chemiosmosis?

Chemiosmosis is used to generate 90 percent of the ATP made during aerobic glucose catabolism. The production of ATP using the process of chemiosmosis in mitochondria is called oxidative phosphorylation.

Does chemiosmosis occur in photosynthesis or cellular respiration?

Yes, chemiosmosis occurs in photosynthesis and respiration. During photosynthesis, chemiosmosis occurs in the chloroplasts, whereas during respiration, chemiosmosis occurs in the mitochondria.

How is chemiosmosis different from diffusion?

Osmosis is the process of diffusion of water molecules across a selectively permeable membrane. Chemiosmosis is the process of diffusion of ions (usually H+ ions, also known as protons) across a selectively permeable membrane.

Is chemiosmosis part of the electron transport chain?

Energy released in these reactions is captured as a proton gradient, which is then used to make ATP in a process called chemiosmosis. Together, the electron transport chain and chemiosmosis make up oxidative phosphorylation.

Where does the chemiosmosis take place?


The generation of ATP by chemiosmosis occurs in mitochondria and chloroplasts, as well as in most bacteria and archaea, an electron transport chain pumps H+ ions (protons) in the thylakoid spaces through thylakoid membranes to stroma (fluid).

How Chemiosmosis couples the electron transport chain to ATP synthesis?

Chemiosmosis: In oxidative phosphorylation, the hydrogen ion gradient formed by the electron transport chain is used by ATP synthase to form ATP. … The turning of this molecular machine harnesses the potential energy stored in the hydrogen ion gradient to add a phosphate to ADP, forming ATP.

What are the reactants of Chemiosmosis?

The main biochemical reactants of the ETC are the electron donors succinate and nicotinamide adenine dinucleotide hydrate (NADH). These are generated by a process called the citric acid cycle (CAC). Fats and sugars are broken down into simpler molecules such as pyruvate, which then feed into the CAC.

What stage of cellular respiration is Chemiosmosis?

Oxidative phosphorylation

Oxidative phosphorylation is the final stage of aerobic cellular respiration. There are two substages of oxidative phosphorylation, Electron transport chain and Chemiosmosis. In these stages, energy from NADH and FADH2, which result from the previous stages of cellular respiration, is used to create ATP. Figure 5.9.

What direction do protons flow during Chemiosmosis in chloroplasts?

The protons flow back from intermembrane to the matrix in mitochondria, and from thylakoid to stroma in chloroplast through ATP synthase to drive the synthesis of adenosine triphosphate. Therefore, the adenosine triphosphate is produced within the matrix of mitochondria and within the stroma of chloroplast.

Is chemiosmosis endothermic?

This reaction is endothermic, so it requires energy. The energy comes from the force of the hydrogen ions that flow through a channel in ATP synthase. How many ATP can be synthesized from one original molecule of glucose during the process of chemiosmosis? … No ATP are synthesized during this stage.

What is needed for chemiosmosis?

Chemiosmosis uses membrane proteins to transport specific ions. Furthermore, it does not require chemical energy (e.g. ATP) as opposed to an active transport system that does. In chemiosmosis, the formation of an ion gradient leads to the generation of potential energy that is sufficient to drive the process.

Which processes are coupled during chemiosmosis?

The four basic postulates of chemiosmosis are (1) that the membrane-located adenosine triphosphatase (ATPase) reversibly couples the translocation of protons across the membrane to the flow of anhydro-bond equivalents between water and the couple adenosine triphosphate (ATP)/(adenosine diphosphatase (ADP) + Pi); (2) …

Is combustion exothermic or endothermic?

Overall, combustion is an exothermic reaction given off or exiting , which means that energy is released. Usually, heat and light are released during a combustion reaction.

Which reaction is endothermic in respiration?

Glycolysis I is the only endothermic reaction in cellular respiration, the other processes are exothermic.

Which can drive the endothermic reaction?

By breaking the phosphate bond in atp , is used to drive endothermic reactions in a Cell. Explanation: In case of endothermic reaction there is absorption of energy inside the medium.

Is vaporization endothermic or exothermic?

Phases and Phase Transitions

Phase TransitionDirection of ΔH
Vaporization (liquid to gas)ΔH>0; enthalpy increases (endothermic process)
Sublimation (solid to gas)ΔH>0; enthalpy increases (endothermic process)
Freezing (liquid to solid)ΔH<0; enthalpy decreases (exothermic process)

Which combustion is endothermic?

All combustion reactions are endothermic.

What reaction takes place during combustion?

Combustion is a high-temperature exothermic (heat releasing) redox (oxygen adding) chemical reaction between a fuel and an oxidant, usually atmospheric oxygen, that produces oxidized, often gaseous products, in a mixture termed as smoke.

Is vaporization physical or chemical change?

Physical changes that involve a change of state are all reversible. Other changes of state include vaporization (liquid to gas),freezing (liquid to solid), and condensation (gas to liquid). Dissolving is also a reversible physical change.

Why is vaporization an endothermic change?

Vaporization is an endothermic process because it takes energy to vaporize the molecules in a liquid. It requires overcoming the intermolecular forces that hold together liquids.

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