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2 years ago

Identify all statements that accurately describe the structure of the pyruvate dehydrogenase ( PDH ) complex.

Chemistry

1 answer:

Nostrana [21]2 years ago

5 0

Answer:

The statements that correctly describes pyruvate dehydrogenase includes:

- Several copies each of E 1 and E 3 surround E 2.

-A regulatory kinase and phosphatase are part of the mammalian PDH complex.

-E 2 contains three domains.

Explanation:

Pyruvate dehydrogenase is a hydrolase key enzyme in glucose metabolism which converts pyruvate to acetyl- ChoA. It also forms a complex that catalyzes an irreversible reaction that is the entry point of pyruvate into the TCA cycle. Pyruvate dehydrogenase complex contains E1, E2 and E3 enzymes that transform pyruvate, NAD+, coenzyme A into acetyl-CoA, CO2, and NADH. Also, A regulatory kinase and phosphatase are part of the mammalian PDH complex and E 2 contains three domains.

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Ans with solution...

Licemer1 [7]

Answer:

The answer to your question is:

Vol of NO2 = 11.19 L

Vol of O2 = 2.8 L

Explanation:

Data

N2O5 = 56 g

STP T = 0°C = 273°K

P = 1 atm

MW N2O5 = 216 g

Gases law = PV = nRT

Process

216 g of N2O5 ---------------- 1 mol

54 g ----------------- x

x = (54 x 1) / 216

x = 0.25 mol of N2O5

2 mol of N2O5 ----------------- 4 mol of NO2

0.25 mol ------------------ x

x = (0.25 x 4) / 2 = 0.5 mol of NO2

V = nRT/P

V = (0.5)(0.082)(273) / 1 = 11.19 L

2 mol of N2O5 ----------------- 1 O2

0.25 N2O5 ---------------------- x

x = (0.25 x 1) / 2 = 0.125 mol

Vol = (0.125)((0.082)(273) / 1 = 2.8 L

3 0

3 years ago

Industrial ethanol (CH3CH2OH) is produced by a catalytic reaction of ethylene (CH2═CH2) with water at high pressures and tempera

Natasha2012 [34]

Answer:

using bond energies = - 37 kJ

using enthalpies of formation = - 45.7 kJ

Explanation:

From the reaction;

CH2═CH2(g) + H2O(g) -------> CH3CH2OH(g)

From the above reaction; there are 4 (C-H) bonds , 1 ( C=C) and 2 (H-O) of ethene which forms 5(C-H) bonds, 1 (C-C) and 1 (C-O) and 1(H-O) bonds.

Using Bond Energies; the heat of the reaction can be written as:

$\delta H^0_ {rxn}=$ ∑ energy of old bond breaking + ∑ energies of the new bond formation.

$\delta H^0_ {rxn}=$ ∑ $[(4 * BE_{C-H}) + BE_{C-C}) + + BE_{O-H})]$ + ∑ $[(5 * BE_{C-H}) + BE_{C-C}) + BE_{O-H}+ BE_{C-O})]$

$\delta H^0_ {rxn}=$ ∑ $[4*413 kJ)+(614kJ)+(2*647kJ]$ + ∑ $(5*-413kJ)+(-347kJ)+(-467kJ)+(-358kJ)]$

$\delta H^0_ {rxn}=$ -37 kJ

To calculate the heats of reaction by using enthalpies of formation; we have:

$\delta H^0_ {rxn}=$ ∑ $\delta H^0_ {products}$ - ∑ $\delta H^0_ {reactants}$

$\delta H^0_ {rxn}=$ ∑ $\delta H^0_ {CH_3CH_2OH}$ - ∑ $\delta H^0_ {CH_2=CH_2+H_2O}$

$\delta H^0_ {rxn}=$ (-235.1 kJ) - [(+52.47 kJ) + (-241.826 kJ)]

$\delta H^0_ {rxn}=$ -45.7 kJ

6 0

3 years ago

Please help Sodium (Na) has an atomic number of 11 and an atomic mass of 23. Which of the following correctly shows the electron

fredd [130]

2,8,1
It's in group 1, so its outershell only has 1 electron, and the other shells are completely filled, so 2 then 8. :)

3 0

3 years ago

A sailor on a trans-Pacific solo voyage notices one day that if he puts 375. mL of fresh water into a plastic cup fresh water we

ElenaW [278]

Answer:

Amount of salt dissolved in each liter of seawater = 40 g

Explanation:

According to Archimedes principle, a body will float in a fluid if the upthrust experienced by a body is equal to the to the weight of the body.

Also, the volume of seawater displaced equals the volume of freshwater in the cup.

From the above principle, since the freshwater and cup floats in the seawater, their combined weight equals the upthrust.

Therefore, mass of equal volume of displaced seawater = mass of freshwater + mass of cup

Mass of freshwater = density of freshwater * volume

density of freshwater = 1 g/mL; volume = 375 mL

mass of freshwater = 375 mL * 1 g/mL = 375 g

mass of seawater = 375 + 15 = 390 g

mass of salt in 375 mL seawater = mass of seawater - mass of freshwater

mass of salt = (390 - 375) g = 15 g

Since 15 g of salt are dissolved in 375 mL seawater, mass of salt in 1 L of seawater =(1000 mL/ 375) * 15g = 40 g

Therefore, amount of salt dissolved in each liter of seawater = 40 g

3 0

3 years ago

Two atoms that share one electron each between have a ?

evablogger [386]

Answer:

Covalent bond

Explanation:

A covalent bond is defined as the sharing of election pairs between atoms

8 0

2 years ago