biol: rank the primers in the order they were produced?

Question

http://session.masteringbiology.com/problemAsset/1108498/21/1108498_006.jpg

from earliest to latest. if they overlap, then please state. i don't understand this at all! thanks!

Answer 1

It looks like H,A,G,B at the same time followed by C,F same time then D,E same time.

Answer 2

Order Primers

Answer 3

First: A and H

Second: G and B

Third: F and C

Last: D and E



As soon as the replication bubble opens and the replication machinery is assembled at the two replication forks, the two primers for the leading strands (primers a and h) are produced. The production of the first primers on the lagging strands (those closest to the origin of replication, b and g) is delayed slightly because the replication forks must open up further to expose the template DNA for the lagging strands.



After completion of the first segments of the lagging strands, additional template DNA must be exposed before the second primers (c and f) can be produced. And after completion of the second segments, additional template DNA must be exposed before the third primers (d and e) can be produced. In summary, because of the way the replication bubble expands, the lagging strand primers near the origin of replication were produced before the primers near the replication forks.

Answer 4

First: Overlap H and A

Second: Overlap G and B

Third: Overlap C and F

Fourth: Overlap D and E