16 Questions
What is the role of enzymes in biological reactions?
They lower the activation energy for reactions
What is a holoenzyme?
A complete, functional enzyme with its cofactors
Where does the substrate bind and catalysis occur in enzymes?
Active site
What is the term for the energy barrier that substrates need to overcome before a reaction will occur?
Activation energy
What happens to the activation energy required when enzymes are present?
It decreases
Do enzymes participate directly in the reaction?
No, they do not
Which type of enzymatic action describes the process of joining two or more substrate molecules together?
Ligation
What are small organic molecules that act as cofactors for enzymes called?
Coenzymes
Which type of enzymatic specificity refers to the enzyme acting on a particular steric or optical isomer?
Stereochemical specificity
Which model of enzyme binding suggests that the active site of the enzyme is complementary in shape to the substrate, with no change in shape upon binding?
Lock-and-key model
What family of enzymes assists in the breakdown of carbohydrates?
Amylases
What term is used for cofactors that are tightly bound to enzymes?
Prosthetic groups
Which type of specificity refers to the enzyme acting on molecules with specific functional groups?
Group specificity
What are the most common cofactors?
Coenzymes and metal ions
Which enzyme is used to break protein down into peptides in the stomach?
Pepsin
What term is used for enzymes that contain tightly bound metal ions?
Metalloenzymes
Learn about enzymes, holoenzymes, substrates, and the catalytic role of enzymes in biological reactions. This lecture provides an introduction to the functions and structure of enzymes, presented by Dr. Michael Mounir from the Faculty of Science at Helwan University.
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