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2021-05-15

What blocks the electron transport chain?

What blocks the electron transport chain?

Electron transport inhibitors act by binding one or more electron carriers, preventing electron transport directly. An inhibitor may competely block electron transport by irreversibly binding to a binding site. For example, cyanide binds cytochrome oxidase so as to prevent the binding of oxygen.

Which part of the electron transport chain do cyanide and carbon monoxide inhibit?

Cyanide: inhibits terminal electron transfer to oxygen, Complex IV. 4. Carbon Monoxide: inhibits cytochrome oxidase by competing with an oxygen- binding site, Complex IV.

What is the final electron acceptor in mitochondrial electron transport?

Oxygen is the terminal electron acceptor in the mitochondrial electron transport chain and therefore is required for the generation of energy through oxidative phosphorylation.

Which is the final electron acceptor?

Oxygen

What are the consequences of diverting electrons from the transport chain?

What are the consequences of diverting these electrons from the transport chain? The intermembrane compartment becomes more acidic. More ATP are generated per glucose molecule. More energy is lost as heat.

What will happen to the pH inside of a Thylakoid that is exposed to light?

What will happen to the pH inside of a thylakoid that is exposed to light? It will decrease. If a thylakoid is placed in a basic solution ATP synthesis will occur. The light reactions and carbon reactions occur in different cells, so oxygen does not come into contact with rubisco.

Which type of mutation would have the biggest evolutionary consequence?

point mutation

When oxygen accepts electrons water is produced as a by product?

Chapter 7

Question Answer
Electrons are brought to the electron transport system by the oxidation of: NADH and FADH2
The movement of protons through ATP synthase occurs from the: Intermembrane space to the matrix
True or False: When oxygen accepts electrons, water is produced as a byproduct? True

What happens when oxygen accepts electrons?

As it turns out, the reason you need oxygen is so your cells can use this molecule during oxidative phosphorylation, the final stage of cellular respiration. Oxygen sits at the end of the electron transport chain, where it accepts electrons and picks up protons to form water.

What is the driving force for ATP synthesis?

Phosphorylation. The PMF is the driving force for ATP synthesis by the mechanoenzyme complex V, or F1Fo ATPase. When protons flow through a channel in the enzyme, the movement spins the protein, much like wind drives a turbine.

How does Valinomycin affect ATP synthesis?

Valinomycin slows mitochondrial ATP synthesis without blocking electron transfer to O2 (Table 18-4). A pH electrode registers a sudden decrease in the pH of the medium, indicating that protons are moving out of the mitochondria.

What is the driving force for diffusion?

The driving force for diffusion is the thermal motion of molecules. At temperatures above absolute zero, molecules are never at rest. Their kinetic energy means that they are always in motion, and when molecules collide with each other frequently, the direction of the motion becomes randomized.

What is the major difference between osmosis and diffusion?

In diffusion, particles move from an area of higher concentration to one of lower concentration until equilibrium is reached. In osmosis, a semipermeable membrane is present, so only the solvent molecules are free to move to equalize concentration.

Is osmosis special form of diffusion?

Osmosis is a special type of diffusion, namely the diffusion of water across a semipermeable membrane. Water readily crosses a membrane down its potential gradient from high to low potential (Fig. 19.3) [4]. Osmotic pressure is the force required to prevent water movement across the semipermeable membrane.