Gene Expression in Prokaryotes

What is a gene?

• A segment of RNA that encodes for a protein
• A chromosome
• A segment of DNA that encodes for a protein
• Your genome

Tags

NGSS.HS-LS1-1

Most gene regulation happens at which step along the way?

• translation
• transcription
• signal transduction
• DNA replication

How is prokaryotic gene expression regulated?

• By controlling fission
• By controlling replication
• By controlling translation
• By controlling transcription using DNA binding proteins

What is an operon?

• a small organelle that functions as the site of protein manufacture.
•  any of a class of single-stranded molecules transcribed from DNA, containing a long-, linear-sequence of nucleotides
• a genetic-sequence of linked genes whose transcription is under the coordinated control of a promoter, an operator, and a regulator gene.
•  the process by which double-stranded DNA makes copies ofitself, each strand, as it separates, synthesizing a complementary strand.

Operons are found in the cells of which of the following types of organisms?

• prokaryotes (bacteria)
• eukaryotes (plant and animals)
• animals only
• viruses

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

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