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Biology 18 Online
OpenStudy (anonymous):

TRUE OR FALSE: Because the DNA double helix is only l0 nm wide, well below the resolution of the light microscope, it is impossible to see chromosomes in living cells without special stains.

OpenStudy (shrutipande9):

To be able to differentiate between one Chromosome from another, Scientists use a Acetocarmine Stain. It is a Dye to make the Chromosome appear red in color. i dont think it is because the double helix in 10nm wide. in chromosomes u cannot see the double helix...u see the completely packed form of dna and not just 2 strands.

OpenStudy (shrutipande9):

so i guess it is false.

OpenStudy (anonymous):

thank you, also is the double helix really 10nm or smaller

OpenStudy (shrutipande9):

it is not 10nm...the width of helix is 2nm distance between 2 adjacent nucleotides is 3.4nm. total of 10.6 bp fit in one turn so length of one turn is 34nm

OpenStudy (anonymous):

thank you

OpenStudy (shrutipande9):

ur welcum:)

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