Imagine you want to study human crystallins, proteins present in the lens of the eye. to obtain a sufficient amount of the protein, you decide to clone the crystallin gene. would you construct a genomic library or a cdna library? what material would you use as a source of dna or rna?

Johnny rode his bike to a friend's house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was not able to play. what was his displacement for the total bike ride? how did you determine this? what could we use as a reference point to determine he was in motion during his bike ride? why can you use it as a reference point