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5

Unlike that in organic chemistry, polar and non-polar compounds determination is done differently in biochemistry, probably because most biochemical reactions are done in aqueous medium. Therefore, the classification of them as polar and non-polar is somewhat different from source to source. In general, amino acids, which can make hydrogen bonding in aqueous ...


2

To answer this question, we need to be clear whether we are talking about the change in entropy of the system, the surroundings and the Universe. With regards to the entropy of the Universe, the answer is direct: photosynthesis is a process we observe to happen on a macroscopic scale. Therefore, by the second law of thermodymamics, photosynthesis must cause ...


2

Poly(lactic-co-glycolic acid) or PLGA is a biodegradable copolymer of lactic acid ($\ce{CH3CH(OH)CO2H}$) and glycolic acid ($\ce{HOCH2CO2H}$). Poly(lactic acid) or PLA is, on the other hand, a polymer of lactic acid, which is also biodegradable. Since both polymers are linked together by ester linkages of their monomers, the resulting polymers can be ...


0

There is only scarce literature about Onchidal:( The mechanism of the AChE blockade by Onchidal was suggested to be a novel one; it was not like the Sarin-like inactivation of the serine residue in the activation site (1). Note that alpha, beta-unsaturated aldehyde in Onchidal is potentially reactive. Onchidal has been shown to give some adducts to lysine ...


8

Isoelectric point of an amino acid is the $\mathrm{pH}$ at which the molecule carries no net charge[1]. It can be calculated by the average of the relevant $\mathrm pK_\mathrm a$ values as you have mentioned. Your confusion seems to stem from choosing the relevant $\mathrm pK_\mathrm a$ values. For this we should refer to the titration curve of the amino ...


2

You seem to be having trouble with the terms alpha and beta and how to recognize these terms in carbohydrates. Here is an easy way to recognize them. In a Fischer projection of glucopyranose, the hydroxyl group in the beta anomer is on the left; the alpha anomer is on the right. [Notice that the italicized terms have fewer letters than the bold terms!] In ...


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