Vectors such as puc18 and others of the puc series contain a large number of restriction enzyme sites clustered in one region. which term describes this advantageous arrangement of restriction sites?

multiple cloning site

Explanation:

Based on the information provided within the question it can be said that the term being described is a multiple cloning site or MCS for short. Like mentioned in the question this refers to a region of DNA located inside a Plasmid, which holds various Restriction enzyme sites clustered in one reagion, each of which are unique.

a covalent bond, specfically triple bond

phaneritic textures in which phaner means visible so phaneritic textures are standard of impertinent volcanic rocks. these rocks crystallized gradually under the surface of earth. when the magma cools deliberately then the ores have chance to develop and produce long crystals.