Below is the sequence from the 3′ end of an mrna. 5′--3′ if you were told that this sequence contains the stop codon for the protein encoded by this mrna, what is the anticodon on the trna in the p site of the ribosome when release factor binds to the a site?
a) 5'-cca-3'
b) 5'-ccg-3'
c) 5'-ugg-3'
d) 5'-uua-3'

D

Explanation:

The mRNA sequence given is in the 5' to 3' direction, the anticodon on the tRNA is in the opposite direction to the mRNA so would be in the 3' to 5' direction.

First we have to find the stop codon in the mRNA which is UAA, UAG or UGA.

5′--3′.

Now that we have found the stop codon, we can determine what the anticodon is by using the complementary sequence to the stop codon. This will be 3'-AUU-5', because A is complementary to U and G is complementary to C. The answers are given in the 5' to 3' direction, therefore we turn it around so that it is 5'-UUA-3' and we have our answer.

se

explanation:

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.