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Biology
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12 Dec 2019

1. Does tyrosinase appear to exhibit absolute specificity your or group specificity (i.e., catalyze the reaction of a structurally related group of substances)?

2. Explain the differences in inhibitory activity between resorcinol, benzoic acid and phenylthlouirea.

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13 Dec 2019
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Related questions

1. tRNA aminoacylation

a. What is aminoacylation? Where on the tRNA does it occur?

b. Why is ATP required for aminoacylation? Why is the hydrolysis of PPi generated during aminoacylation important?

c. What is the significance of the high-transfer potential of the ester bond created during tRNA aminoacylation?

d. Why is the specificity of aminoacyl-tRNA synthetases important? How do these enzymes ensure their specificity?

e. Are you familiar enough with amino acid side chains to answer questions about aminoacyl-tRNA synthetase specificity? (e.g. how might similar amino acids like valine, serine and threonine be distinguished?)

f. Do you understand why there are differences in amino acid recognition between activation and editing sites? And how those differences dictate the specificity of the two different activities?

Q1. Will the omission of the 7.5% NaCl in MSA medium affect its specificity or sensitivity? Explain.

Q2. Will the addition of only 1/10th of mannitol in the MSA medium affect its specificity or sensitivity? Explain.

Q3. In clinical settings, Blood Agar plates are used to detect b-hemolysin producers. Suppose that after processing a patient’s sample, you saw growth on Blood Agar plate, but with no single colonies. Of the areas that showed growth, you observe full clearing of the blood cells. What conclusions would you draw about the presence of the b-hemolysin producers and a-hemolysin producers? Explain.

Q4. On EMB plates, colonies that would normally appear pink may turn into a metallic green shade if left sitting on the plate for multiple days. Explain why that is the case. Is this a specificity or sensitivity problem?

Q5. One of the features that separate E. coli from closely-related species are its ability to ferment lactose very efficiently. (A) If the lactose in the EMB plate is replaced with glucose, will it affect the specificity or sensitivity of the media?

(B) If the amount of lactose in EMB is reduced by 75%, will that impact the specificity or sensitivity of the medium?

A group of enzymologists wanted to find a form of alkaline phosphatase capable of maintaining high specific activity at high temperatures. First, they purified alkaline phosphatase from bacteria that live in hot springs. Next, they studied the effects of pH and temperature on specific activity. Finally, because alkaline phosphatase is a metalloprotein, they evaluated the effects of different metal ions on specific activity. 1.What reaction does alkaline phosphatase catalyze? Identify the substrate (type of molecule), any other reactants and the product(s). 2.What organisms make alkaline phosphatase enzymes? 3.Define specific activity and indicate units. Be sure you distinguish between

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