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# AP Biology Enzymatic Reaction Questions.?

Time(sec) 0 10 20 30 40 50 60

Product Formed(mg) 0.0 0.25 0.50 0.70 0.80 0.85 0.85

a. What is the initial rate of this enzymatic reaction?

b. what is the rate after 50 seconds? Why is it different from the initial rate?

c. What would be the effect on product formation if the enzyme were heated to a temperature of 100 C for 10 minutes before repeating the experiment? Why?

d. How might altering the substrate concentration affect the rate of of the reaction? Why?

e. How might altering the pH affect the rate of reaction? Why?

Please give explanations so I can understand. Thank You!

### 1 Answer

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I would suggest, for the initial rate problems, to put these values within your calculator to determine the equation that links time to product formed. Using the equation, determine the derivative function, and use the derivative function, calculate rate of change [for next time, use derivatives to calculate rate of reaction instead of inaccurate slope fields of BC calculus]

1.) Initial Rate: 0 seconds, 0 mg formed: therefore, 0 per 0

2a.) y = -0.00029x^2+0.0319x -0.015

y' = -0.00058x +0.0319

y'(50) = 0.0029 products per second

2b.) The enzymatic reaction is an exponentially decreasing equation; and, due to the 0 rate at the beginning [as nothing has happened], when the reaction begins, the rate will increase, regardless of the speed [speed cannot be negative production].

c.) If the enzyme catalyst' temperature was increased prior to an experimental repeat, then the reaction rate would increase; reaction rate is directly correlated to temperature and product concentration.

d.) Depending on the type of rate of reaction, as if it were a first-order or second-order reaction, the addition of a substrate concentration would increase the reaction rate. As time increased, the product formation rate would additionally increase, by a rate proportional to the amount of product added [also, taking into consideration the type of reaction]; the decrease of a concentration would opposite decrease the rate of reaction

e.) Altering the pH could both increase and decrease the rate of reaction; if the enzyme were basic, and the pH were lowered, more toward the 0-2 range, the enzyme would be less effective, as the basic solution would produce a neutralization reaction, and leave less of the enzyme to react in a exponential way; if the pH were increased, and the enzyme was acidic, then neutralization would also occur, and produce a rate-decreasing effect; also, if the pH levels of the solution of enzymes was similar to the enzyme, then the natural environment would partially facilitate an increase in reaction rate.

That's all i've got.

Source(s): AP Chemistry Class
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