TPR Course Test 1: Rate of reaction

[studentdoctor611]

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Hello,

I can't understand why D is incorrect. It seems that the DOPC + raclopride is increasing linearly over time. So why is D incorrect?

Thank you!

 

[NextStepTutor_3]

Hi there! It looks like you might've uploaded a screenshot of the wrong question - it's one about the ideal gas law that doesn't seem to relate to the passage.

Looks like a tough one though! I'd guess answer D says something about the rate of lipid hydrolysis increasing over time?

 

[Chiongo]

Hi there! It looks like you might've uploaded a screenshot of the wrong question - it's one about the ideal gas law that doesn't seem to relate to the passage.

Looks like a tough one though! I'd guess answer D says something about the rate of lipid hydrolysis increasing over time?

Hey I am now on same qn and have the same problem I also chose D, linear relationship but the answer says " The slope of Figure 2 is the rate of lipid hydrolysis (change in concentration over a change in time), and as the slope with DOPC + 5 mol% of raclopride is constant, choice D is incorrect." what does that mean confused.

 

[NextStepTutor_3]

Hi @Chiongo! I'm still not exactly sure what choice D says, since the question wasn't uploaded. I can only see the explanation, which is also the part you quoted. But let me take a stab at it anyway!

I'm assuming choice D says that the rate of lipid hydrolysis increases linearly over time (or something similar to that). According to Figure 2, it is actually the concentration of lyso-PC that increases linearly over time. The rate can actually be found by taking the slope of the line in Figure 2, which is a constant slope (the slope of a straight line will be a constant value - just think of the y = mx + b form of the equation for a line).

Since the rate is therefore constant, the rate actually is not increasing over time. It's just staying the same. So if choice D said the rate is increasing - or if it said that in some other way, such as "the rate has a linear relationship with [some other quantity that is increasing]," then that's why choice D is a wrong answer.

Let me know if any of this is confusing, or if I can help with anything else 🙂