In gel electrophoresis why does the dna move towards the bottom of the wall of gel?

a) dna is negatively charged
b) dna is positively charged
c) dna is extremely heavy
d) dna is less dense than air

In terms of alternation of generations, the internal parts of the pollen grains of seed-producing plants are most similar to a ) moss sporophyteb) moss gametophyte bearing both male and female gametangiac) fern sporophyted) fern gametophyte bearing only antheridia

The following hormone had their receptors in the cell membrane except a-insulin b-tsh c-gh d- cortisol

The small molecule cyclic amp (camp) takes about 0.2 second to diffuse 10 μm, on average, in a cell. suppose that camp is produced near the plasma membrane on one end of the cell; how long will it take for this camp to diffuse through the cytosol and reach the opposite end of a very large cell, on average? assume that the cell is 200 μm in diameter.