Answer:
The answer is given below
Explanation:
Cys 278 residue is the only available cysteine which is alkylated by the addition of N-Ethylmaleimide or NEM (alkylating agent). It works by only alkylating the sulfhydryls. In this case, Cys 278 residue is the only one which has exposed cysteine residue.
While the other residues have their sulfhydryls group either involved in the synthesis of disulfide bonds of proteins or their Cys residues are intrinsically placed in the proteins and cannot be alkylated with NEM.
NEM cannot alkylate if its protein is not available in the free form or it is in bounded form. For NEM to alkylate Cys 278, it should be free and should have sulfhydryls available for alkylation.
Alkylation: it is the transfer of alkyl groups. Alkyl groups contain Hydrogen and Carbon in their structure.
Answer:
Classifying stars according to their spectrum is a very powerful way to begin to understand how they work. As we said last time, the spectral sequence O, B, A, F, G, K, M is a temperature sequence, with the hottest stars being of type O (surface temperatures 30,000-40,000 K), and the coolest stars being of type M (surface temperatures around 3,000 K). Because hot stars are blue, and cool stars are red, the temperature sequence is also a color sequence. It is sometimes helpful, though, to classify objects according to two different properties. Let's say we try to classify stars according to their apparent brightness, also. We could make a plot with color on one axis, and apparent brightness on the other axis, like this:
Explanation:
Answer:
Most interactions among atoms take place in the outermost shell of each atom. The number of each electron in this shell determines how an atom combines with other atoms to form compounds. When atoms combine they gain, lose or share electrons in such a way that the outer shells become chemically complete.
Explanation:
The approximate degree of dissociation of a 0.35 M solution of lactic acid is 4,87%
<h3>What is degree of dissociation?</h3>
The degree of dissociation is the quantity used to express the strength of a base, that is, its ability to conduct electric current, which depends on the amount of ions released in the dissociation.
The degree of dissociation (α) is another way of determining the strength of a base. It indicates the fatty acids that were released from a base when it dissociates in water.
With that being said, C stands for concentration and α is the the degree of dissociation.
Latic Acid can be written as C3H6O3
![Ka = \frac{[H^{+}] [CH3CH(OH)CO2^{-}] }{CH#CH(OH)CO2H} = \frac{C^{2} \alpha^{2} }{C(1-\alpha )} = \frac{C\alpha ^{2} }{(1-\alpha )}](https://tex.z-dn.net/?f=Ka%20%3D%20%5Cfrac%7B%5BH%5E%7B%2B%7D%5D%20%5BCH3CH%28OH%29CO2%5E%7B-%7D%5D%20%20%7D%7BCH%23CH%28OH%29CO2H%7D%20%3D%20%5Cfrac%7BC%5E%7B2%7D%20%5Calpha%5E%7B2%7D%20%20%7D%7BC%281-%5Calpha%20%29%7D%20%3D%20%5Cfrac%7BC%5Calpha%20%5E%7B2%7D%20%7D%7B%281-%5Calpha%20%29%7D)
As α is too small (1-α) can be neglected.
![Ka = C\alpha ^{2} \\\\\\alpha = \sqrt[]{\frac{Ka}{C} }](https://tex.z-dn.net/?f=Ka%20%3D%20C%5Calpha%20%5E%7B2%7D%20%20%5C%5C%5C%5C%5C%5Calpha%20%20%20%20%3D%20%5Csqrt%5B%5D%7B%5Cfrac%7BKa%7D%7BC%7D%20%7D)
In this case, is possible to see that approximate degree of dissociation of a 0.35 M solution of lactic acid is 4,87%
See more about pKa at: brainly.com/question/14924722
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Answer:
[∝] = +472
Explanation:
Specific rotation in a solution is defined as:
[∝] = ∝ / c×l
Where:
[∝] is specific rotation, ∝ is observed rotation (In degrees), c is concentration in g/mL and l is path length (In dm).
∝: +47.2°
c: 2.0g / 50mL = 0.04g/mL
l: 25cm × (1dm /10cm) = 2.5dm
Replacing:
[∝] = +47.2° / 0.04g/mL×2.5dm = <em>+472</em>
I hope it helps!
