441 Answered Questions for the topic biochemistry

10/30/19

Does ADP allosterically activate or inhibit pyruvate kinase in Glycolysis? Or does it play a role in the allosteric regulation? If so, how?

I cannot find anywhere in my textbooks or scientific literature if whether or not ADP plays a role in allosterically activating or inhibiting pyruvate kinase in the glycolytic pathway. I know that... more

10/28/19

Buffer Solution Chemistry Math Question 6

How many grams of potassium lactate (KC3H5O3) must be added to 276.0 ml of 0.2 M lactic acid in order to prepare a buffer solution at pH 3.3? The pKa of lactic acid is 3.8.

10/28/19

Buffer Solution Chemistry Math Question

How many grams of benzoic acid would you add to 25 mL of 0.45M sodium benzoate in order to prepare a buffer solution at pH=3.8? Ka of benzoic acid is 6.3E-5

10/23/19

Acids & Bases Chemistry Math Question 6

An aqueous solution containing 0.24 M of unknown base has a measured pH equal to 8.39. What is the value of pKb for the unknown base?

10/23/19

Acids & Bases Chemistry Math Question 5

In a 0.1 M solution of chlorous acid, what percentage of the acid is ionized to the chlorous anion, ClO2-? Ka = 1.1 x 10-2

10/23/19

Acids & Base Chemistry Math Question

A solution of carbonic acid has its pH adjusted to 8.19 by addition of strong base. What is the equilibrium concentration ratio of carbonate ion to carbonic acid in the final solution? The acid... more

10/18/19

Calculate the formula mass of each compound. Keep at least one decimal place in atomic masses from the periodic table.

hydrogen peroxide, H2O2: phosphoric acid, H3PO4:

10/17/19

Chemistry: Equilibrium Math Question 9

The equilibrium constant for dissociation of ammonium chloride:NH4Cl(s) ↔ NH3(g) + HCl(g)is equal to KP = 0.013312 at 550.0 K. If 1.5 g of ammonium chloride is placed in a 1.0 L vessel and charged... more

10/17/19

Chemistry: Equilibrium Math Question 8

The water-gas shift reaction is crucial to many industrial processes:H2O(g) + CO(g) ↔ H2(g) + CO2(g)The equilibrium constant for this reaction is K = 3.087012 at 802.0 K. If a vessel is initially... more

10/17/19

Chemistry: Equilibrium Math Question 7

Consider the equilibrium between hydrogen sulfide and its gaseous elements:2 H2S(g) ↔ 2 H2(g) + S2(g) KP = 2.023E-6 at 908.0 Kif a vessel is initially charged with 8.35 bar of pure H2S(g), what is... more

10/17/19

Chemistry: Equilibrium Math Question 6

Determine the equilibrium vapor pressure of germanium metal at 508.0 C. The standard enthalpy of vaporization of germanium is 376.6 kJ/mol and the vapor pressure at 100 C is 1.6E-32 Pa. Be sure to... more

10/17/19

Chemistry: Equilibrium Math Question 5

A closed vessel is charged with 0.23 bar of hydrogen gas and allowed to react with excess I2(s) at 25 C.H2(g) + I2(s) ↔ 2 HI(g)What is the final equilibrium pressure of HI(g) in the vessel? KP = 0.284 more

10/17/19

Chemistry: Equilibrium Math Question 4

At 25 C, the partial pressure of CO2(g) in a bottle of soda water is 1 bar. Calculate the equilibrium concentration of dissolved carbon dioxide under these conditions. The equilibrium constant for... more

10/17/19

Chemistry: Equilibrium Math Question 3

A2B ↔ 2A + BWith this simple equation, if you start with 0.815 M A2B, and at equilibrium 53% of it has decomposed, what is the equilibrium constant?

10/17/19

Chemistry: Equilibrium Math Question 2

The equilibrium constant for dissolving oxygen gas in aqueous solution is 1.33E-4. Compute the equilibrium concentration of dissolved oxygen, in mg L-1 when the partial pressure of O2 above the... more

10/17/19

Chemistry: Equilibrium Math Question

If a closed vessel is charged with 89000.0 Pa of nitric oxide and allowed to react with excess liquid bromine, what is the equilibrium partial pressure of the product?NO(g) + ½ Br2(l) ↔ NOBr(g)... more

10/16/19

AP Chemistry Question

Which of the following ions has the same number of electrons as Br -. A. Ca2+B. K+C. Sr2+D I-E Cl-

10/16/19

Is it possible to chemically synthesize blood?

Like we know all the chemical compositions of blood and add the ingredients. We even know the compositions of each blood group and synthesize it to be of a particular group, say A - (which is... more

10/03/19

Why does biological tissue shrink in ethanol?

Moving aldehyde-fixed biological tissue (in my case, 200um thickness mouse brain slices) from water to ethanol shrinks them considerably, even when transitioning slowly. I know that ethanol moves... more

09/23/19

CHEMISTRY stoichiometry and moles and combustion problem

Methanol has the chemical formula CH3OH. If 4 moles of methanol are combusted, how many moles of oxygen will be consumed? a- 2molb- 3 molc- 4 mold- 6 mole- not enough information

09/15/19

Molecules and Formula unit

some times we are asked to write the equation in particles form. I was wondering what is the difference between molecules and formula unit cause google didn't help.

09/09/19

Specific heat for Chemistry

A 121 g piece of metal is heated to 282 degree Celsius and dropped into a 85.0 gram of water at 26.0 degree Celsius. If the final temperature of water and metal is 58.4 degree Celsius, what is the... more

09/04/19

How much of each do we add? - DNA Extraction Buffer

We are given: 50 mls of DNA extraction buffer2% SDS,   100mM tris pH 8,     10mM EDTA,    and proteinase K [1 ug/ml] How much of each do we add?
1 3 5 6 7 18

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