You have a 12 mL sample of acetylcholine( a neurotransmitter) with an unknown concentration and a pH of 7.86. You incubate this sample with the enzyme acetylcholinesterase to convert all of the acetylcholine to choline and acetic acid. The acetic acid dissociates to yield acetate and hydrogen ions. At the end of the incubation period, you measure the pH again and find that it has decreased to 5.68. Assuming there was no buffer in the assay mixture, determine the number of nanomoles of acetylcholine in the original 12 mL sample.

You have a 25 mL sample of acetylcholine (a neurotransmitter) with an unknown concentration and a pH of 7.93. You incubate this sample with the enzyme acetylcholinesterase to convert all of the acetylcholine to choline and acetic acid. The acetic acid dissociates to yield acetate and hydrogen ions. At the end of the incubation period, you measure the pH again and find that it has decreased to 6.15. Assuming there was no buffer in the assay mixture, determine the number of nanomoles of acetylcholine in the original 25 mL sample. Remember to use significant figures in your answer. сн, CH, сH, —с —о—сн, — сн, — N—сн, H,0 но—сн, ——сн,— "N—сн, + сH,—ҫ—о + H CH, ČH, Acetylcholine Choline Acetate 7.02 acetycholine in original sample: nmol Incorrect

Which of the following enzymes is involved in the hydrolysis of ester bond? Select one: Acetylcholinesterase enzyme Dopa decarboxylase Chymotrypsin enzyme Angiotensin converting enzyme (ACE)

Your supervisor gave you a 5% saline (NaCl) solution. You need to make 100ml of 1.0% saline solution. How much 5% saline would you take to complete the task?