A biologist performed two series of experiments on lactase, the enzyme that hydrolyzes lactose to glucose and galactose. First, she made up 10% lactose solutions containing different concentrations of enzyme and measured the rate at which galactose was produced (grams of galactose per minute). Results of these experiments are shown in Table A below. In the second series of experiments (Table B), she prepared 2% enzyme solutions containing different concentrations of lactose and again measured the rate of galactose production.
Graph and explain the relationship between the reaction rate and the enzyme concentration.

Question

A biologist performed two series of experiments on lactase, the enzyme that hydrolyzes lactose to glucose and galactose. First, she made up 10% lactose solutions containing different concentrations of enzyme and measured the rate at which galactose was produced (grams of galactose per minute). Results of these experiments are shown in Table A below. In the second series of experiments (Table B), she prepared 2% enzyme solutions containing different concentrations of lactose and again measured the rate of galactose production.
Graph and explain the relationship between the reaction rate and the enzyme concentration.
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Graph and explain the relationship between the reaction rate and the enzyme concentration.

Accepted Answer

Welcome back. Here's our next question. It says, hydrogen peroxide is considered a harmful byproduct of many natural metabolic processes. How does the enzyme catalysts prevent the damage brought about by this chemical compound? Well, again, because hydrogen peroxide is very damaging to cells and tissues, it must be rapidly decomposed before it can build up. And catalyst catalyze is the decomposition oops of hydrogen peroxide into oxygen. Gasses oxygen and water. So two harmless compounds for the body. And it needs to do this very rapidly again, because you don't want this harmful hydrogen peroxide hanging around doing damage to the cells and tissues so rapidly is important here. So, with that in mind, let's look for our answer choices, Choice A says, by rapidly catalyzing its decomposition process and this is what we need. This breakdown happened quickly. That's what catalyst does, Choice B says, by speeding up its synthesis. Well, if you sped up the synthesis, you generate more hydrogen peroxide faster. So that definitely is what we'd be wanting to happen here. So, Choice B is not correct choice E says, by catering its anabolic process, anabolic processes. Something that synthesizes large molecules or more complex molecules. So that doesn't even make sense to this question here. So, not our answer choice D says, by increasing the activation energy needed for the decomposition process to take place. Well, if you increase the activation energy of reaction, you slow it down because it has less of a chance for the the reaction to go forward with an increased activation energy. So that's gonna have the opposite effect of what we need to reduce damage. So Choice D. Is not our answer. So again, how did the enzyme catalyst prevent the damage brought about by hydrogen peroxide? Choice A by rapidly catalyzing its decomposition process? See you in the next video.

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Key Concepts

Enzyme Kinetics

Substrate Concentration

Reaction Rate