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A sample of cells with a total receptor concentration of 50 mM was incubated with a ligand concentration of 100 mM. Following the incubation period, the concentration of unbound receptors was determined to be 15 mM. What is the Kd for the receptor-ligand interaction?
A) 28 mM
B) 43 mM
C) 143 mM
D) 217 mM
E) 333 mM
When an ant bites you, the reason it stings is because of an injection of formic acid. What is the pH when 50.0 mL of 0.1480 M formic acid (HCOOH) is titrated with 40.2 mL of 0.1841 M NaOH? PKa formic acid = 3.745.
What advantages exist when using the balloons to model molecular shapes? what advantages exist when using the model kit to model molecular shapes
Presume that a membrane channel obeys the concerted allosteric model with Hill coefficient 2.5. In the presence of 12 μM ligand the ratio of opened to closed channels is 0.2. Explain what is the fraction of opened channels in the presence of 0.1 m..
The retina of a human eye can detect light when radiant energy incident on it is at least 4.0 x 10^-17 j. For light of 600 nm wavelength, how many photons does this correspond to
Calculate the amount of heat, in kJ, needed to convert 15.0 g of ice at -21 C to liquid water at 75 C. Specific heat of ice = 2.10 J/(g C); heat of fusion of ice = 334 J/g; Specific heat of water = 4.18 J/(g C)
a solution of h2so4 with unknownconcentration was titrated with the standard base with .0233molarity. a volume of
What is the empirical formula of a compound composed of 3.25% hydrogen (H), 19.36% carbon (C), and 77.39% oxygen (O) by mass? 2. A compound with the empirical formula CH2 has a molar mass of 84 g/mol. What is the molecular formula for this compoun..
A 2.48 L sample of He at 739 torr is mixed with 6.08 L of Ar at 325 torr both at 25 degrees C is placed in a 4.80 L container at 25 degrees C. What is the partial pressure in atm of He
At what temperature is the change in entropy for the reaction equal to the change in entropy for the surroundings A reaction has delta Hrxn= -125KJ and delta Srxn= 330J/K.
Calculate the volume in mL of 1,00g of water at each temperature and then calculate the percentage increase in volume that occurs as water is heated from 4.0 degrees Celsius to 60.0 degrees Celsius.
one mole of calcium carbonate reacts with ammonia to produce cacn2 and liquid water. the reaction absorbs 90.1 kj of
Calculate the surface area for a 35.0mg sample of this material. 3. A 10.0-mL sample of contaminated water had 7.748mg of mercury in it. After treatment with 10.0mg of the new spongy material, 0.001mg of mercury remained in the contaminated water...
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