SBI4U Genetics

what is an operon?

• a part of a ribsome
• a part of a Rna
• a unit made up of linked genes that code for proteins needed to do a specific task
• needed for dna replication

A protein that binds to the operator and blocks the RNA polymerase

• regulator
• repressor
• activator
• corepressor

The "on/off" switch for an operon is called the

• promoter
• repressor
• operator
• gene

What is the name of the stretch of DNA where RNA polymerase binds?

• operator
• promoter
• enhancer
• origin

What is the role of operons in prokaryote gene expression?

• It makes the genes prokaryotes be turned on
• It accounts for the regulation of gene activity in response to the needs of the cells
• To make DNA for the gene
• To make the gene turn of and off

Which of these is an inherited trait for humans?

• knowing how to read
• speaking English
• being able to play the violin
• having two arms 

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Which of these is a learned behavior for a dog?

• walking on four legs
• rolling over on command
• barking
• panting 

Knowing how to read a book is an example of

• a physical trait
• an inherited behavior
• a learned behavior 
• an inherited trait

In the lac operon model the genes within the operon will be expressed if:

• lactose is absent in the cell
• glucose is present in the cell
• lactose is present in the cell

The lac operon genes only become expressed if:

• lactose binds to the repressor
• glucose binds to the repressor
• lactose binds to the operator
• the repressor binds to the operator