Restriction enzymes are used to a: amplify a region of dna b: cut double-stranded dna c: splice a region of dna into a vector d: hybridize dna with rna

A amplify a region of DNA

Restriction enzymes are DNA-cutting enzymes found in bacteria  Because they cut within the molecule, they are often called restriction endonucleases. In order to be able to sequence DNA, it is first necessary to cut it into smaller fragments.

The Answer is A

By water evaporation from the leaves is created a negative pressure at the top of the tree that promotes the ascension  of the water through channels that are called xylem. there are also two molecule forces that are involved: the intra-water molecules cohesion (water molecules stick to each other) and the adhesion when the water molecules stick to the channels they are running in. this is what enables water to go from the roots to the top of a tall tree.