What is one difference between gene regulation in prokaryotes and eukaryotes? (1 point)
All eukaryotes use operons to organize their genes while prokaryotes do not.
Prokaryotes remove exons from mRNA before translation while eukaryotes translate the entire sequence of mRNA.
Eukaryotes transcribe genes in response to environmental stimuli while prokaryotes transcribe genes randomly.
Prokaryotes do not store their genes in a nucleus like eukaryotes do.
Prokaryotes do not store their genes in a nucleus like eukaryotes do.
What would happen if a cell transcribed and translated a gene's intron by mistake? (1 point)
• The intron would begin to duplicate itself.
• Additional amino acids would be inserted into the chain.
• Errors in the protein folding would be repaired.
• The DNA would remain the same as before.
If a cell transcribed and translated a gene's intron by mistake, additional amino acids would be inserted into the chain.
In prokaryotic cells, repressor proteins bind to a section of DNA called a/an (1 point)
O chromatin.
O operator.
O repressor.
O promoter.
In prokaryotic cells, repressor proteins bind to a section of DNA called an operator.
The removal of sections of RNA, called introns, occur at which regulation step in eukaryotic cells? (1 point)
O RNA processing
O post-translation
O mRNA life span
• chromatin remodeling
The removal of sections of RNA, called introns, occur at the RNA processing step in eukaryotic cells.
Hox genes are regulatory genes in multicellular animals that code for transcription factors that determine the basic body plan in a developing embryo. They act as switches that turn other genes on and off. Scientists have found that a mutation in a fruit fly hox gene produces flies with legs instead of antennae sticking out of their heads. Another hox gene mutation results in fruit flies with two pairs of wings instead of one pair. Hox genes affect body plans by controlling the expression of many other genes.
Many multicellular animals have the same hox genes. Which statement is evidence for this claim?
(1 point)
The body plans of complex animals change over generations.
The body plans of complex animals are very similar to one another.
The body plans of complex animals typically have a large number of mutations.
• There is a wide variety of body plans in complex animals.