Answer:
D) Yes, it is important that the single-stranded DNA have 3′ ends, so resection must occur in the 5′ to 3′ direction.
Explanation:
During homologous recombination, the exonucleases remove nucleotides from the free 5' ends of the DNA at the double-stranded breaks to create a double-strand gap.
Removal of more nucleotides from the free 5' ends creates 3' single-strand extension which in turn invades the intact homolog and pairs with its complementary sequence of the DNA. The invaded free 3' end is then extended by DNA polymerase to give rise to Holiday junctions.
If the resection occurs in the opposite direction and creates overhangs with free 5' ends, the free 3' ends would not be available to serve as a primer to facilitate the replication.
Answer:
Nickel, Ni, atomic number 28
:
Nickel, Ni, atomic number 28 Is a transition metal. It falls in the "d" region. 4 of Period, group 10.
Calcium and magnesium are alkaline earth metals, and antimony is a metal in the nitrogen group.
Littoral cells are the areas of the coastline where sediment is constantly being moved in and out. This is usually done by waves and currents. The main reason for this is to keep the coastline from eroding away.
The movement of sediment along the coast is primarily controlled by the processes of erosion and deposition. Erosion is the process by which wave action and other agents break down and wear away rocks and other materials. This process typically occurs along the shoreline, where waves crash against the land.
Deposition is the process by which eroded materials are transported and deposited elsewhere. This can occur either offshore, where materials are carried by currents and then deposited on the seafloor, or onshore, where materials are transported by currents and then deposited along the shoreline.
The movement of sediment in and out of littoral cells is an important part of the sediment budget. The sediment budget is the balance between the amount of sediment that is being eroded and the amount that is being deposited. Littoral cells are areas of the coast where sediment is constantly being moved in and out. These areas are usually located near river mouths or along the shoreline.
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