Which of the following is an example of post-transcriptional control of gene expression?

• The addition of methyl groups to cytosine bases of DNA

• the binding of transcription factors to a promotor

• the removal of introns and alternative splicing of exons

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

The production of mature mRNA in eukaryotes involves

• cutting introns out and spicing exons together
• adding the 5' cap
• adding the 3' poly A tail
• all of these are correct

Which process is shown?

• diffusion
• repiration
• recombination
• translation

Protein molecules around which DNA is tightly coiled in chromatin

• Histones
• Whey
• Casein
• Hemoglobin

Tags

NGSS.HS-LS1-1

The parts of a gene that do NOT code for amino acids in a protein are called

• introns
• exons
• codons
• anticodons

Causes of gene mutations

• can occur spontaneously in the cell

• environmental agents

• cancer causing agents-carcinogens

• all of the above

Tags

NGSS.HS-LS3-2

NGSS.HS-LS4-2

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

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