Complete the following statements regarding the steps necessary to copy a dna sequence during pcr: 1) the two original strands of the dna molecule can be separated by 2) the enzyme "reads" each template strand and adds to make a new strand.

1. Helicases

2. DNA polymerases, nucleotides

Explanation:

During DNA replication Helicases are the enzymes which separates the two strands of DNA forming replication fork.

DNA polymerase add DNA nucleotides to form new strand. DNA polymerases does not add nucleotide itself instead need a small RNA fragment called primer which bind with the template DNA strand. Once primer bind the DNA polymerase add nucleotides to the new strand.

increase soil erosion                                             reduce soil erosion

cattle grazing                                                         hydroseeding

deforestation                                                         contour plowing

                                                                                planting vegetation

plant roots basically hold the top soil

together and stop soil erosion because

in such situation top soil is not removed

during flood but cattle grazing causes

soil erosion because cattle consume the

grasses and herbs and top soil is exposed.

same situation occurs because of

deforestation, the trees and plants are cut

down to expose top soil which causes soil

erosion