What would happen to the protein if there was a mutation in its promoter region?
The protein would be nonfunctional due to an early stop codon.
RNA polymerase would not bind to the gene, so the protein would not be made.
The protein would be nonfunctional because the mutation would alter the gene's reading frame.
The protein would function normally, since the promoter is upstream of the reading frame.

americans began to notice growing differences between the northern and southern sections of the country. there were more people living in cities in the north, which made it more urban. more people lived on farms in the south, which made it more rural. while many people were farmers in the northern states, there were now other ways to make a living, such as working in mechanical cotton gins factories manufacturing cloth, tools and other goods. people in the north supported high tariffs on goods imported from europe because the extra cost encouraged people to “buy american” instead. in the southern states, planters did not like tariffs because they sold most of their production to europe and bought their tools from there as well. southerners believed the protective tariff was something that only northern factory owners keep their profits high. so the southern politicians came up with an idea. they would opt out. they would simply ignore the protective tariff. it was ‘null and void’ in south carolina. the state would not collect the taxes on goods imported into south carolina, no matter what the president said they had to do. this decision led to the nullification crisis.

cell regulation is conducted by special proteins.

the correct answer is:

a population changes in response to a change in the environment.