A bacterial culture is being grown in a medium containing a light isotope of nitrogen (14N), it is moved to a medium containing a heavier isotope of nitrogen (15N). After twenty minutes you take a DNA sample and spin it down in cesium chloride by centrifugation and see one distinct band of DNA. Twenty minutes later you take another sample and see two distinct bands of DNA with the second being heavier than the first. If you took another sample twenty minutes after that (after a third replication) how many bands would there be given the semi-conservative model is true

the correct answer should be false

{apex}

an organism's phenotype is the  form of a trait  that it  displays. for  flowercolor, a pea  plant  can  display  a phenotype of purple or white flowers. an organism's  genotype  is the alleles of a gene it contains. based on his data, mendel concluded that a phenotype can be  determined  by more than one  genotype.

sheep is a herbivore animal whereas grasshopper belongs to the class chordates but both of them feed on greens.  

if grasshopper and sheep feeding on a pasture land, i do not think both of them will have any impact on each other. however, the number of the species can make difference. since sheep feed on greens, there is a possibility there left no pasture land for the grasshoppers or they may get extinct.