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Ch 19: Praxis Biology & General Science: RNA and Gene Expression

About This Chapter

Our video lessons can provide you with an overview of RNA and gene expression. Use these lessons on protein synthesis, RNA transcription and genetic code to prepare for the Praxis II Biology and General Science exam.

Praxis Biology & General Science: RNA and Gene Expression - Chapter Summary

Use this chapter on RNA and gene expression to prepare for the Praxis II test on biology and general science. You'll study the central dogma and find out about the three phases of transcription, then move on to genetic code, translation and epigenetics. You'll learn about key terms like protein synthesis, genes, operon, induction and repression. Once you've watched all the videos in this chapter you'll understand:

  • How genetic information transforms from DNA to RNA to protein
  • Transcription from DNA to messenger RNA
  • How gene expression is regulated
  • Regulation of gene expression in the eukaryotic cell
  • Genetic code used to translate RNA into amino acids
  • RNA codon chart and codon recognition
  • How ribosomes and peptide bonds are used in genetic translation
  • Uses for embryonic and adult stem cells

Professional instructors lead these lessons that include engaging videos, quizzes and lesson transcripts. You can watch the videos and then take the quizzes to test your knowledge of the subject matter. If you missed or want to review a critical point, you can use the video tags that take you to major concepts in the videos.

Praxis Biology & General Science: RNA and Gene Expression Objectives

Use the lessons on RNA and gene expression to prepare for the molecular and cellular biology content area of the Praxis II Biology and General Science test. In this content area, you'll find 18 questions that represent about 15% of the entire test. Outside of this content area, you'll be tested on scientific methodology, plant and animal diversity, evolution, ecology, chemistry, physics, earth and space science and classical genetics.

11 Lessons in Chapter 19: Praxis Biology & General Science: RNA and Gene Expression
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.

Regulation of Gene Expression: Transcriptional Repression and Induction

3. Regulation of Gene Expression: Transcriptional Repression and Induction

Do our genes work the same way all the time? How do we regulate the expression of our genes? Explore the various ways organisms control gene transcription through repression and induction of operons.

How An Operon Controls Transcription in a Prokaryotic Cell

4. How An Operon Controls Transcription in a Prokaryotic Cell

Is gene regulation really as simple as flipping a switch? What are the parts of an operon, and how do they function to control gene transcription? We'll study the lac operon to answer these questions.

RNA Processing in a Eukaryotic Cell: Splicing of Introns & Exons

5. RNA Processing in a Eukaryotic Cell: Splicing of Introns & Exons

In this lesson, we'll explore the unique considerations for gene regulation in the eukaryotic cell. We'll walk through RNA splicing of introns and exons and the addition of the 5' cap and poly(A) tail.

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

6. 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

7. 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.

Codon Recognition: How tRNA and Anticodons Interpret the Genetic Code

8. Codon Recognition: How tRNA and Anticodons Interpret the Genetic Code

How does codon recognition work at the molecular level? Can you use tRNA and anticodons to decipher the genetic code? Learn the mechanics of codon recognition and build a polypeptide from a sample genetic code.

The Role of Ribosomes and Peptide Bonds in Genetic Translation

9. 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

10. 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.

Embryonic and Adult Stem Cells: Uses, Origins & Properties

11. Embryonic and Adult Stem Cells: Uses, Origins & Properties

How can we grow a brand new windpipe? Or a heart? In this lesson, we'll learn about embryonic and adult stem cells and how scientists are using them to give people a new lease on life.

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Other Chapters

Other chapters within the Praxis Biology and General Science: Practice and Study Guide course

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