Operons

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

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

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

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

Protein molecules around which DNA is tightly coiled in chromatin

• Histones
• Whey
• Casein
• Hemoglobin

Tags

NGSS.HS-LS1-1

A chemical modification of DNA that does not affect the nucleotide sequence of a gene but makes that gene less likely to be expressed.

• methylation
• acetylation
• transcription
• translation

RNA interference means short RNA sequences bind to ___ and prevent their translation.

• mRNA
• tRNA
• rRNA
• ribosomes

A major role is played by-----what in RNA interference that regulates human growth/development?

• Complementary RNA bases
• tRNA
• mRNA
• miRNA/small RNA molecules
  
  

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

Inheritance of traits by mechanisms not directly involving nucleotide sequence is called

• epigenetic inheritance
• differential gene expression
• chromosomal inheritance
• gene regulation