Fruits ripen due to an enzyme converting starch into sugar. Keeping fruits in the refrigerator slows this process. Which sentence explains why?
Enzymes are solar-powered, they
convert light energy into chemical
energy, which they hand down to
their substrate. The refrigerator is
dark once the doors are closed the
enzymes won't get enough energy.
The enzyme converting starch into
sugar catalyzes the reaction at 20°C
(room temperature) and the reaction
rate decreases at lower
temperatures.
The enzyme converting starch into
sugar switches substrates at lower
temperatures and then starts
catalyzing another unrelated
substrate.
The reaction rate is constant
regardless of the temperature, but
the concentration of starch decreases
at lower temperatures.