Question Video: Recalling the Name of the Substance That Binds in an Enzymes Active Site | Nagwa Question Video: Recalling the Name of the Substance That Binds in an Enzymes Active Site | Nagwa

Question Video: Recalling the Name of the Substance That Binds in an Enzymes Active Site Biology • Second Year of Secondary School

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Fill in the blank: The reactant that an enzyme will bind to, due to its complementary shape, is a/an _.

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Video Transcript

Fill in the blank. The reactant that an enzyme will bind to, due to its complementary shape, is a blank.

This question asks us to recall some terms relating to enzymes. So let’s review these briefly.

You might remember that an enzyme is a biological catalyst. This is because enzymes accelerate chemical reactions. A chemical reaction is the process in which a substance or multiple substances are changed into a new substance or new substances. The initial substance is called a reactant, and the final substance of the reaction is called a product. The enzyme can only help to speed up a chemical reaction if the reactant binds at a specific place on the enzyme called the active site.

When an enzyme is involved in the reaction, the reactant is called a substrate. The binding of enzyme and substrate occurs through complementary shapes between the enzyme and the substrate. You can see this complementarity in this diagram. More specifically, we can say that the enzyme’s active site is complementary to its specific substrate. Each enzyme has a specific substrate that it binds to.

Enzymes are very important to catalyze various chemical reactions in our bodies. This is the reason they are quite abundant in the body. Actually, scientists believe that there are more than 1000 different enzymes in human body cells.

Now that we have discussed some basic terminology relating to enzymes and their substrates, let’s take another look at our question. We were asked to fill in the blank. The reactant that an enzyme will bind to, due to its complementary shape, is a blank. We know that enzymes bind to specific substrates via their complementary active site. So the correct answer here is substrate. Our full answer should therefore read, “The reactant that an enzyme will bind to, due to its complementary shape, is a substrate.”

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