Topic 3: DNA and RNA metabolism
LEARNING OBJECTIVES
After completing this lesson, you will be able to:
After completing this lesson, you will be able to:
- Understand the mechanism of DNA replication.
- Understand the process of gene expression.
- List the main types of DNA mutation and mechanism of DNA repair.
Topic 3: Key Points
In this section, we explored the following main points:
In this section, we explored the following main points:
- The process of DNA replication is controlled by several proteins that act together to assure the correct base pairing for creation of the new DNA strand.
- Transcription is the first step of gene expression, in which a particular segment of DNA is copied into RNA (mRNA) by the enzyme RNA polymerase.
- In translation, messenger RNA (mRNA)—produced by transcription from DNA—is decoded by a ribosome and tRNA to produce a specific amino acid chain, or protein.
- Mutations are changes in the genetic sequence (DNA or RNA sequence), that can be beneficial or may result in damage, if not repaired.
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