Depurination of purine bases results in an apurinic site. Assume a single depurination event occurs in the GC base pair of the sequence below and is not repaired. Then, if two rounds of replication occur, which of the following DNA sequences will exist after two rounds of replication
...TACT...
...ATGA...
Select one or more:

A. ...TAAT...
. ...AT_A...
B. ...TAGT...
. ...ATCA...
C. ...TATT...
...ATAA...
D. ...TAAT...

When does a spring tide occur? question 9 options: they occur when the sun, moon, and earth are aligned. in spite of their name, these tides occur twice a year in the spring and fall. they occur on the date of the vernal equinox each year, no matter what stage the moon is in. this is why they are called spring tides. they occur when the sun, moon, and earth are at 45-degree angles from each other. this happens once every spring. they occur when the sun, moon, and earth are aligned. in spite of their name, these tides occur all year long.