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Concept explainers
(a)
To determine: The structure of intermediate which is accumulated when respiration is stopped
Introduction:
Mitochondria is the primary site of
Given:
(b)
To explain: The reason of intermediate accumulation.
Introduction:
Succinate dehydrogenase -plays a major role in cellular respiration that monitors oxygen level which is found in the inner mitochondrial membrane. In pseudo-hypoxia conditions (low oxygen level), succinate dehydrogenate generates signals and send them to brain. It is given that
(c)
To explain: The reason why the oxygen consumption stops.
Introduction:
All the
(d)
To explain: The method to overcome the inhibition of respiration in isolated mitochondria.
Introduction:
Malonate is a competitive inhibitor that inhibits the activity of succinate dehydrogenase. Due to malonate activity, respiration stops eventually. To overcome the effect of the inhibition, it is sufficient to provide large amount of substrates such as succinate.
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Chapter 16 Solutions
SaplingPlus for Lehninger Principles of Biochemistry (Six-Month Access)
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- Background Freezing isn't the only challenge in cryopreservation - thawing can be just as difficult. A microwave oven seems like a nice solution, since it deposits energy quickly and microwaves are non-ionizing radiation (they do not cause DNA mutation). However, water absorbs microwaves more effectively than ice does, meaning that the portion of an organ that has already melted will get warmer at a higher rate than the remaining ice – the opposite of what we want! - The transmission of radiation through a weakly absorbing material such as ice or water can be modeled by Beer's law, which assumes that the rate of absorption at a depth x is proportional to the local radiation intensity I(x) times an absorption coefficient, which is often written as μ or a or just µ). Noting that absorption decreases the intensity, we can write a differential equation a Solving the differential equation with the boundary condition on the surface being gives the relationship For a standard microwave oven…arrow_forward3. Dry air is inhaled at a rate of 10 liter/min through a trachea with a diameter of 20 mm and a length of 125 mm. The inner surface of the trachea is at a normal body temperature of 37°C and may be assumed to be saturated with water. a. Assuming steady, fully developed flow in the trachea, estimate the mass transfer convection coefficient. b. Estimate the daily water loss (liter/day) associated with evaporation in the trachea.arrow_forward1. Conceptual questions a. What dimensionless group describes the relative importance of convection versus diffusion. Explain the physical basis of this group. b. For mass transfer from a flowing fluid to a reactive surface, explain how convection increases the flux of solute to the surface.arrow_forward
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- Assume that an enzyme-catalyzed reaction follows the scheme shown: E+S SES →E + P k₁ = 1 x 109/M-s k-1=2.5 x 10%/s k₂ = 3.4 x 107/s What is the dissociation constant for the enzyme-substrate, K,? What is the Michaelis constant, Km, for this enzyme? What is the turnover number, Keat, for this enzyme? What is the catalytic efficiency for the enzyme? If the initial Et concentration is 0.25mM, what is Vmax?arrow_forwardAn enzyme lowers the activation energy, (AG) of a reaction from 50.0 kcal/mol to 40.0 kcal/mol. Calulate the catalytic power at 310K. (R-1.987x10 kcal/mol)arrow_forwardDraw a typical axodendritic synapse, including a specific neurotransmitter of your choice, its associated postsynaptic receptors (indicating whether they are ionotropic or metabotropic), and any associated reuptake transporters or degradation enzymes. Please include a description of what specific steps would occur as an action potential reaches the axonal terminal.arrow_forward
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