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Ch 5: Biology: DNA & Enzymes

About This Chapter

This chapter fleshes out a large number of terms, structures and functions key to the study of DNA and enzymes. The lessons guide you through the interactions of DNA components while also exploring them individually.

Biology: DNA & Enzymes - Chapter Summary

This chapter examines DNA bases and structure as well as important functions and topics related to enzymes. You'll also learn about the differences between RNA and DNA as well as the different forms of RNA. A full list of subjects discussed includes the following:

  • Chemical structure of nucleic acids & phosphodiester bonds
  • DNA base paring
  • Double helix structure and hereditary molecule
  • Substrate, active site, and activation energy of enzymes
  • Environmental effects of enzymes
  • Coenzymes, cofactors, and prosthetic groups
  • Enzymatic reactions

The timeline feature underneath each video lesson gives you the ability to hop around main points of the lesson. For those who choose to receive the material through the included transcript, bolded words throughout make it easy to spot key terms and topics. And if you ever feel lost, you can always ask questions of our professional instructors using the teacher or help tab and they will respond as soon as they are able.

8 Lessons in Chapter 5: Biology: DNA & Enzymes
Test your knowledge with a 30-question chapter practice test
DNA: Chemical Structure of Nucleic Acids & Phosphodiester Bonds

1. DNA: Chemical Structure of Nucleic Acids & Phosphodiester Bonds

In this lesson, you'll discover what nucleotides look like and how they come together to form polynucleotides. We'll also explore nucleic acids and focus on DNA in particular.

DNA: Adenine, Guanine, Cytosine, Thymine & Complementary Base Pairing

2. DNA: Adenine, Guanine, Cytosine, Thymine & Complementary Base Pairing

Learn the language of nucleotides as we look at the nitrogenous bases adenine, guanine, cytosine and thymine. Armed with this knowledge, you'll also see why DNA strands must run in opposite directions.

DNA: Discovery, Facts, Structure & Function in Heredity

3. DNA: Discovery, Facts, Structure & Function in Heredity

This lesson will help you to navigate the twists and turns of DNA's structure. We'll also clue you in on the amazing discoveries that put this nucleic acid in the limelight as the molecule of heredity.

Differences Between RNA and DNA & Types of RNA (mRNA, tRNA & rRNA)

4. Differences Between RNA and DNA & Types of RNA (mRNA, tRNA & rRNA)

In this lesson, you'll explore RNA structure and learn the central dogma of molecular biology. Along the way, you'll meet the three types of RNA and see how the cell uses them most effectively.

Function of Enzymes: Substrate, Active Site & Activation Energy

5. Function of Enzymes: Substrate, Active Site & Activation Energy

In this lesson, we'll learn how enzymes function to lower the activation energy of a chemical reaction. Enzymes bind to their substrates to perform all kinds of important and essential cellular processes, as well as processes that help you enjoy a slice of pizza!

Enzyme Activity & Inhibition: Structure, Substrates, pH & Temperature

6. Enzyme Activity & Inhibition: Structure, Substrates, pH & Temperature

Enzymes appreciate the right working conditions. Can you blame them? We all work best in the correct environment. In this lesson, we'll learn how substrate concentration, temperature, and pH affect enzyme activity and structure.

Coenzymes, Cofactors & Prosthetic Groups: Function and Interactions

7. Coenzymes, Cofactors & Prosthetic Groups: Function and Interactions

Some enzymes require helpers to recognize a substrate or complete a reaction. These helpers include cofactors, coenzymes, and prosthetic groups, which are required for some enzymes' functions.

Enzymatic Reactions: Inhibition and Regulation

8. Enzymatic Reactions: Inhibition and Regulation

Enzymes are generally not allowed to run uncontrolled in a cell. While they are useful in catalyzing reactions, there is a time and place for everything. In this lesson, we'll discuss enzyme activators and inhibitors that regulate these reactions positively and negatively, respectively.

Chapter Practice Exam
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Practice Final Exam
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