The lock-and-key mechanism refers to?
a.) the complementary shapes of an enzyme and a substrate.
b.) the attractive forces between an enzyme and a substrate.
c.) the ability of an enzyme to lower the activation energy of a reaction.
d.) the ability of an enzyme to “unlock” the products of a reaction.

hey there!

so, when you eat, your teeth chew and grind food into smaller pieces. this is mechanical digestion. then reactions aided by digestive enzymes break down large food molecules into smaller molecules. this is chemical digestion. the two processes change the food into simpler substances that can be used by the body for raw materials and energy.

hope this

tobey

kelp are large brown algae that live in cool, relatively shallow waters close to the shore. they grow in dense groupings much like a forest on land. these underwater towers of kelp provide food and shelter for thousands of fish, invertebrates, and marine mammal species.

e) all of the above