AP Bio Unit 6

An operon consists of all the the following EXCEPT

• operator
• promoter
• regulatory gene
• genes of the operon

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

• regulator
• repressor
• activator
• corepressor

Two types of negative control are

• repressible & inducible
• repressible & active
• active & inactive
• repressible & corepressible

All of the following are true about DNA methylation EXCEPT

• takes place on the DNA
• enzymes add a methyl group
• when it occurs, transcription is more likely to occur
• chromatin becomes more tightly packed

In eukaryotes, a cluster of proteins that assemble on the promoter is called the

• transcription initiation complex
• control element
• activator
• protein blobby thing

How can a person's muscle cells have the same exact DNA sequences as their nerve cells even though the look and perform completely different?

• The two different cells become mutated
• The proteins expressed in each cell are different
• They actually have different DNA in the two types of cells.
• The genome of the different cells changes

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

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

• promoter
• repressor
• operator
• gene

what does a promoter do?

• it allows a gene to be transcribed
• it creates a DNA segment
• it is another word for ribosomes
• it is another word for RNA

Why are insertion and deletion mutations so harmful?

• They change all of the codons from the mutation on down the line, which changes the amino acid sequence
• They insert things that an organism doesn't need.
• They often delete things that organisms need.
• Insertion and deletions are not any more harmful than substitution mutations.