Bio - Unit 3, Chapter 10, Lesson 4

What is gene regulation?

• A process of cell division

• A functional unit that controls inherited trait expression passed from one generation to another

• A method of protein synthesis

• A type of genetic mutation

What is a mutagen?

The diagram shows a process related to cell mutation. What does the diagram explain?

• The stages of cell division

• The mechanism of DNA replication

• The process of cell mutation

• The effects of cell mutation

A mutation is:

• a change in the DNA sequence

• a type of cell division

• a process of protein synthesis

• a method of genetic inheritance

What does the diagram illustrate about mutation?

An operon is a functioning unit of genomic DNA containing a cluster of genes under the control of a single promoter.

• A single gene

• A cluster of genes under a single promoter

• A type of cell

• A protein

The components of an operon and their functions are described as follows:

• Promoter, Operator, Structural genes - Promoter initiates transcription, Operator regulates access of RNA polymerase, Structural genes code for proteins.

• Promoter, Enhancer, Silencer - Promoter initiates transcription, Enhancer increases transcription, Silencer decreases transcription.

• Operator, Enhancer, Structural genes - Operator regulates access of RNA polymerase, Enhancer increases transcription, Structural genes code for proteins.

• Promoter, Operator, Silencer - Promoter initiates transcription, Operator regulates access of RNA polymerase, Silencer decreases transcription.