Chapter 3 - Enzymes
Section 1 - Enzyme Action
LECTURE VIDEO
DESCRIPTION
They’re the tiny, over-caffeinated workers that run your entire body 24/7. They’re biological matchmakers, molecular Pac-Men, and the reason your lunch doesn’t just sit in your stomach forever. They are ENZYMES.
In this video, we’ll make sure you conquer:
- The “Lock and Key” & “Induced Fit” Model: Is an enzyme a rigid lock or an enthusiastic, squishy handshake?
- Activation Energy: The bouncer at the club of every chemical reaction. How enzymes basically fire the bouncer and let everyone in for free.
- Difference between intracellular and extracellular enzymes (and why Po needs them).
Forget boring textbooks. We’re diving into the frantic, microscopic factory inside you. Master the content, ace your exam, and finally understand why your teacher keeps drawing weird pac-men.
It’s time to catalyze your learning!
TIMESTAMPS
STUDY RESOURCES
00:00:00 – Intro
00:00:13 – Overview Of This Video
00:01:40 – What Are Enzymes
00:08:56 – Intracellular & Extracellular Enzymes
00:16:38 – Lock & Key Model
00:24:25 – Induced Fit Model
00:28:11 – Activation Energy
00:35:01 – Real Example: Lysozyme
00:38:26 – Measuring reaction progress
00:39:50 – Hydrogen Peroxide & Catalase [Measuring Products]
00:45:39 – Starch & Amylase [Measuring Reactants]
00:53:55 – Summary Graph
00:56:54 – Questions & Answers
01:02:32 – Outro
NOTES – All you need to know in one place!
QUESTIONS – Test your Big Brain!
Section 2 - Factors Affecting Enzyme Action
LECTURE VIDEO
DESCRIPTION
They’re not just fussy proteins (that throw a fit if the pH is wrong)—they’re the frantic matchmakers of every chemical reaction in your body. Dive into the high-maintenance world of enzymes for *A-Level Biology*. This video turns up the heat (but not too much!) to explain:
- Temperature Tantrums: Why a little heat speeds them up, but too much turns them into a permanently scrambled egg.
- The pH Panic: Discover why some enzymes are drama queens that only work in a specific acidity zone.
- Enzyme Concentration: What happens when the matchmakers outnumber the singles?
- Substrate Showdowns: We graph what happens when a party gets too crowded.
- Inhibitors – The Party Crashers: Meet the competitive bullies and the non-competitive saboteurs who ruin the fun for everyone.
Understand the diva molecules that make your metabolism possible, one perfectly-catalyzed tantrum at a time.
TIMESTAMPS
STUDY RESOURCES
00:00:00 – Intro
00:00:13 – Overview Of This Video
00:01:45 – Enzyme Concentration
00:12:58 – Substrate Concentration
00:15:55 – Enzyme Affinities
00:24:45 – Temperature
00:30:53 – pH
00:36:49 – Competitive Inhibitors
00:44:43 – Ethylene Glycol & Ethanol
00:47:48 – Non-Competitive Inhibitors
00:54:31 – End-Product Inhibition (Feedback Inhibition)
00:57:59 – Brief Summary
00:58:40 – Questions & Answers
01:03:47 – Outro
NOTES – All you need to know in one place!
QUESTIONS – Test your Big Brain!
Section 3 - Immobilising Enzymes
LECTURE VIDEO
DESCRIPTION
Putting enzymes in alginate beads is like giving them a company car and a permanent job—it just makes them more productive! This A-Level video spills the tea on the fanciest enzymes in town:
- The Gig Economy Upgrade: Why let enzymes be one-hit wonders when you can trap them in jelly beads and reuse them forever?
- The Jelly Jail Recipe: How a splash of alginate and a calcium chloride bath creates the ultimate enzyme workplace.
- Lactose’s worst nightmare: See how these trapped enzymes make milk safe for everyone (and save your stomach from a rebellion).
Ditch the free-range enzymes. It’s time for the efficient, bead-bound life
TIMESTAMPS
STUDY RESOURCES
00:00:00 – Intro
00:00:13 – Overview Of This Video
NOTES – All you need to know in one place!
QUESTIONS – Test your Big Brain!