Question

what environmental changes can cause an increase in the rates of chemical reactions in cells?
A.) increased temperature.
B.) decreased enzyme concentrations.
C.) increased activation enegry requirement.
D.) decreased diffusion rates.

Answer 1

Can you take a guess? Its pretty easy.

Answer 2

Okay since the update deleted my answer I'll try write what I wrote back then 4 hours ago.

This question can be answered using simple kinetics and the molecular interpretation:

B) The rate for an enzyme catalyzed reaction is proportional to the enzyme concentration, mathematically\[\Large v=k \times \left[ E \right]\]
A) Assume the chemical reactions follow the Arrhenius model, we then know that an increase in temperature makes in increase in the rate constant, \(k\) which increase the rate as seen in the equation before.

C) Again assuming reaction follow the Arrhenius model an increase in the activation energy, would result in a decrease in the rate constant.

D) Consider the particles for hard spheres and the upon collision a reaction occur. It should be easy to see that if we want to speed up the reaction, the speed of the particles should be higher, as it increase the chance for the particles to collide. So by reducing diffusion we lower the rate constant.