## End of focus question 7.25

Arrhenius Equation: $\ln k = - \frac{E_{a}}{RT} + \ln A$

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Rida Ismail 2E
Posts: 139
Joined: Sat Sep 07, 2019 12:16 am

### End of focus question 7.25

Can someone please help me on end of focus problem 25

25. Vision depends on the protein rhodopsin, which absorbs light in the retina of the eye in a reaction in which one form, metarhodopsin I, is converted to another, metarhodopsin II. The half-life of this reaction in cattle eyes in 600microseconds at 37 degrees Celsius but 1 second at 0 degrees Celsius, whereas in frog eyes the same process had a half-life that differs by a factor of only 6 over the same temperature range. Suggest an explanation and speculate on the survival advantages that this difference provides the frog.

Thank you!

MingdaH 3B
Posts: 133
Joined: Thu Jul 11, 2019 12:17 am

### Re: End of focus question 7.25

Frogs are cold blooded, so that, even with a great difference in temperature, since their own body temperatures won't compensate for a very cold environment, this reaction still has to occur for them to have vision, and so a reaction rate that has as small of a difference as possible would be evolutionarily favorable.

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