Gene Regulation Flashcards
What is Lac Operone
The lac operon contains three genes: lacZ, lacY, and lacA. These genes are transcribed as a single mRNA, under control of one promoter.
What does MRNA have to do with Lac Operone?
Lac operone is transcribed as a single MRNA. They encode proteins, to allow the bacteria to be broken down and used as energy.
What is beta galactacidase?
It breaks down into simple sugars
What is gene expression?
when a gene is activated and turned into RNA and then protein so that it can have gene expression
What is the ecoli lac operon
It contains genes involved with lactose metabolism. It’s expressed only when lactose is present and glucose is absent.
Define Bacterial dna.
A circular chromosome plus plasmids.
What is a repressor?
It haults gene expression and stops the gene from expressing
Why is the sugar molecule lactose important?
It can bind and so it helps to RNA polymerase break things down. It can help with expression by binding
What is permease?
a membrane bound protein. Permease provides a direct route outisde the cell for it to be put into the cell.
How does RNA polymerase help?
It helps with transcription
T/F translation happens outside the cell
False. It happens inside the cell.
gene regulation, define.
the decision to turn a gene on for expression or not.
What is a promoter?
a short stretch of DNA that helps to tell the gene using a small code that it should begin the process of transcription.
T or F: Polymerase is a promoter
True
What is an inducer?
Factors (chemical or environmental) that turn on or turn off, activators or repressors according to the needs or conditions of the
cell. These can include sugars, other nutrients, heat, light, and hormones.
