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Apamine is a small monomeric peptide toxin present in the venom of the honeybee. It has the sequence: CNCKAPETALCARRCQQH (a) It is known that apamine does NOT react with iodoacetate. How many disulfide bonds are present? (b) Suppose trypsin cleavage gave two peptides. Where is (are) the S-S bond(s)? (Hints: If cut by trypsin, but still held together by a disulfide bond, count it as a single peptide. Also, do not count a single amino acid as a "peptide.")
A solution of I2 was standardized with ascorbic acid. Using .1000 g sample of pure ascorbic acid, 23.25 ml of I2 were required to reach the starch end point.
Some solid remained in the beaker after stirring with HCl. You washed the filter paper with ketone, which caught on fire and the filter paper was scorched
antacids which contain CaCO3 react with stomach acid to the equation . it gives the eq but I cant type it. what is the mass of stomach acid that reacts with 1.00 grams CaCO3 ?
100 mL of 0.200 M HCl is titrated with 0.250 M NaOH .What is the pH of the solution at the equivalence point?Express the pH numerically.
When the sodium atom becomes a sodium ion, how does the size and electron configuration of the sodium atom change?
In an experiment, 2.50 g salicycylic acid was reacted with excess acetic anhydride to synthesize aspirin, as shown below.
Consider the reaction NO + O3 → NO2 + O2 Which has a rate constant given by k = 1.8×10-12 e-1370/T cm3 molecules-1 s-1
What is the mechanism for the oxidation of an aldose to an aldonic acid
Determine the molarity of this solution. (b) If I use 1 cup of vinegar (236.588 mL) to help create a cleaning solution for my windows, how many molecules of acetic acid is this?
how many cans of Mountain Lightning would an individual have to drink to die from a tartrazine overdose If the LD50 of tartrazine in humans is supposed to be 12,750 mg/kg (as it is for mice) and the average human weighs 70 kilograms,?
Ammonia (NH3) is widely used as a fertilizer and in many household cleaners. How much ammonia is produced when 6.32 mol of hydrogen gas react with an excess of nitrogen gas?Answer in units of mol
How many stereoisomers are possible for each of the following substances? Draw them, and name each by the R-S and E-Z conventions.
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