If energy coupling between the reactions atp adp and h h p...

If energy-coupling between the reactions ATP ---> ADP and H---> H-P is direct, how many enzymes and how many steps are required, and how is coupling accomplished? A) One enzyme, two steps; the enzyme binds ATP and P at the same time. B) One enzyme, one step; the enzyme binds ATP and P at the same time. C) One enzyme, one step; the enzyme binds ATP and ADP at the same time. D) One enzyme, one step; the enzyme binds ATP and H at the same time. E) Two enzymes, two steps; one enzyme binds ATP and one binds H at the same time.

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Transcript

00:01 Alright, so in this question, we are asked about enzymes and energy coupling.

00:07 It's a multiple choice question, so we can go ahead and write down our five choices, and while we talk about it, we can eliminate the choices one by one.

00:21 So if energy coupling between the reactions atp to adp and h to hp is direct, how many enzymes and how many steps are required.

00:34 So, let's see, the first question, the first choice, is saying that one enzyme is required and two steps, because both the enzymes bind at the same time.

00:48 So this is not correct because the energy coupling is between atp and adp, not between atp and p.

01:07 So there's no p, but in this answer choice, we have a p.

01:13 Instead, we should be talking about h.

01:17 So directly, we can eliminate answer choice a, because we are talking about a different enzyme.

01:28 All right, let's talk about answer choice b.

01:30 So b is saying one enzyme and one step.

01:36 So the enzyme binds atp and p at the same time.

01:40 This seems right.

01:42 We're talking about one enzyme and one step instead of two steps.

01:51 So for now, let's leave b as is.

01:56 Let's go to c.

01:57 C is talking about a coupling between atp and adp, instead of atp and h...