Ch 15: Molecular Genetics Overview

About This Chapter

With these lessons, you can go through an overview of molecular genetics, such as the genetic code, mutations, and more. Learn about the details of genetics for your own enrichment, or use this chapter to prepare for an exam and improve your grades.

Molecular Genetics Overview - Chapter Summary

We know from such movies as Jurassic Park and X-Men that scientists have studied the genetic code to understand the building blocks of life. This chapter gives you an overview of molecular genetics that steps away from the science fiction to give you the real science facts about such topics as genetic mutation, translation, environmental factors, and so forth.

Each lesson can help you build your scientific vocabulary, since our instructors clearly point out all the keywords and definitions. Furthermore, the instructors walk you through all of these molecular genetic processes with easy-to-follow examples. No matter what your study schedule needs may be, our online platform is here to help you 24/7. Not to mention the fact that you can email your questions to our instructors for some personal, one-on-one help. In this chapter, you will learn:

  • What is the central dogma and protein synthesis in the cell
  • What are DNA, messenger RNA (mRNA), and transcription
  • How to define the genetic code and codon recognition
  • How to use the code to translate RNA into amino acids
  • To identify the functions of peptide bonds and ribosomes
  • What are elongation, initiation, and termination steps in translation
  • How DNA is affected via insertions, point mutations, and deletions
  • What are protein functions and mutations
  • How environmental factors cause mutagens

9 Lessons in Chapter 15: Molecular Genetics Overview
Test your knowledge with a 30-question chapter practice test
Protein Synthesis in the Cell and the Central Dogma

1. Protein Synthesis in the Cell and the Central Dogma

Learn the story of the central dogma and how it relates to protein synthesis. We'll use a simple analogy to explore the roles of transcription and translation in building protein from the DNA code. In this lesson, we'll also introduce the concept of a gene.

Transcription of Messenger RNA (mRNA) from DNA

2. Transcription of Messenger RNA (mRNA) from DNA

In this lesson, you will gain a thorough understanding of how transcription works. We will investigate how DNA is transcribed into RNA with the help of a promoter and RNA polymerase. Learn the purpose of messenger RNA and explore the three phases of transcription.

What Is the Genetic Code That Translates RNA Into Amino Acids?

3. What Is the Genetic Code That Translates RNA Into Amino Acids?

How is RNA translated into a series of amino acids? Learn the language of the genetic code, explore a codon dictionary, and discover some basics of genetics in this lesson on translation.

Making Sense of the Genetic Code: Codon Recognition

4. Making Sense of the Genetic Code: Codon Recognition

Explore the genetic code and how it is translated into a polypeptide. We'll practice using the RNA codon chart and learn the basics of codon recognition.

The Role of Ribosomes and Peptide Bonds in Genetic Translation

5. The Role of Ribosomes and Peptide Bonds in Genetic Translation

Ribosomes play a major role in the process of genetic translation. In this lesson, learn about the structure of ribosomes and how peptide bonds help to create chains of amino acids.

Translation of mRNA to Protein: Initiation, Elongation & Termination Steps

6. Translation of mRNA to Protein: Initiation, Elongation & Termination Steps

Translation, the second part of the central dogma of molecular biology, describes how the genetic code is used to make amino acid chains. In this lesson, explore the mechanics involved in polypeptide synthesis. Learn the three major steps of translation as you watch tRNA, mRNA, and ribosomes go to work.

What is a Point Mutation? - Definition, Causes & Types

7. What is a Point Mutation? - Definition, Causes & Types

What are genetic mutations? How do they affect our DNA? This lesson covers the basics of point mutations and provides simple examples of different mutation types.

Effects of Mutations on Protein Function: Missense, Nonsense, and Silent Mutations

8. Effects of Mutations on Protein Function: Missense, Nonsense, and Silent Mutations

How does a tiny point mutation change the way a protein works? What are the consequences of base substitutions? In this lesson, we'll use an imaginary creature to explore missense, nonsense and silent mutations.

Mutagens: How the Environment Affects Mutation Rates

9. Mutagens: How the Environment Affects Mutation Rates

What causes mutations to occur in living things? How do we avoid mutations? Are mutations always bad? Discover answers to these questions and more in this lesson on mutagens.

Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
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Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
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