During replication which enzyme relieves the tension created by the unwinding of the dna duplex?

ENZYME TOPOISOMERASE RELIEVES THE TENSION CREATED BY THE UNWINDING OF THE DNA DUPLEX.

Explanation:

During replication, the DNA structure undergoes unwinding which is the unfolding of the DNA structure for transcription to take place is performed by an enzyme called Helicases. Topoisomerase are involved in relieving the tension caused by unwinding of the intertwined DNA because the DNA becomes overwound and can stop the actions of DNA or RNA polymerase needed in transcription of the DNA sequences. Topoisomerase binds to the DNA and creates breaks in the DNA which allows for easy unwinding and these breaks can later be resealed after replication as taken place. Two classes are topoisomerase are known; the toposisomerase type 1 which cuts a strand of DNA and allows for relaxation to occur then the re-ligation of the cut strand, it doesn't utilize the ATP for hydrolysis and are grouped into 3 namely Type 1A , Type 1 B, type 1 C; the second class of topoisomerase is type (II) topoisomerase which cuts both strands of a DNA, omits and pass an unbroken strand and then re-ligate the broken strands. It uses ATP for hydrolysis and are of two types; type II A, type II B.

answer: - few nutrients

high pressure

low temperatures

explanation: 1. few nutrients:   open-ocean zone is located way far from the land, which is the main source of the essential nutrients.2. high pressure: pressure increases by 1 atmosphere for every 10 meters increase in depth.3. ample sunlight: a large fraction of the sunlight is reflected back to the atmosphere from the sea surface. 4. varying salinity: below the thermocline, the water is isolated from the atmosphere so the salinity remains stable over the year.5. low temperatures:   the temperature of open-ocean zone ranges from a low of -2°c to an average of 17°c

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.