Question

If substrate concentration is kept permanently high and the enzyme concentration is gradually increased,the rate of activity of the enzyme will:

A.increase
B.increase and then decrease
C.increase and then level off
D.stay the same​

Answer 1

When substrate concentration is high and enzyme concentration is increased, the reaction rate will increase until enzymes are saturated with the substrate, after which it levels off. Hence the correct answer is option C- Increase and then level off.

Step-by-step explanation:

If substrate concentration is kept permanently high and the enzyme concentration is gradually increased, the rate of activity of the enzyme will increase and then level off (Option C). This is observed because initially, more enzymes mean more active sites are available for the substrate to bind to, thereby increasing the reaction rate. However, once there is enough enzyme such that all the substrate molecules can bind simultaneously, adding more enzyme will not increase the rate further because the substrate concentration becomes the limiting factor. The enzymes will then be saturated with the substrate, and even if more enzyme is added, it will not affect the reaction rate significantly. Consequently, when plotting this scenario on a graph with enzyme concentration on the x-axis and reaction rate on the y-axis, we observe a linear increase in the rate until it reaches a plateau where the enzyme has become saturated with the substrate.

Answer 2

If substrate concentration is kept permanently high and the enzyme concentration is gradually increased, the rate of activity of the enzyme will increase and then level off. Option C

As the number of enzymes available to catalyze the reaction is abundant, the rate of the enzyme's activity will initially rise when the enzyme concentration is increased.

At the same time when the enzyme concentration continuously rises, eventually, all the substrate molecules will be consumed, and at this point, it gets stagnant where the pace of the reaction will decrease with the addition of more enzymes. This is referred to as the reaction's maximum velocity.

Hence, when the enzyme concentration is increasing steadily while still maintaining a persistently high substrate concentration, then the rate of the enzyme's activity will rise and then level off.

Therefore Option C is correct