This question made me wonder how long different parts/components would be, so I had to calculate a few more.
Using the compositional data from http://en.wikipedia.org/wiki/Composition_of_the_human_body#Composition_by_molecule_type
I calculated the following
If you were to line up all the cells
in your body they would stretch about 500,000 km
which is a little further than the distance between the earth and the moon.
10^13 cells in the human body * 50 um (average size of a human cell) = 500,000,000 meters
If you were to take all the protein
in the human body and line it up as a single elongated chain
it would stretch about 2.5 light years
, or if it formed a single alpha helix
it would be roughly 1 light year
Humans are roughly 20% protein or around 12 kg on average.
(12,000 g protein) * (The average amino acid is 1 mol / 110 grams) * 6.022*10^23 amino acids / mol =6.57*10^25 amino acids.
The length of an amino acid is roughly 0.36 nm (distance between consecutive alpha carbons), so
6.57*10^25 amino acids * 0.36 nm = 2.4*10^16 meters = 2.5 light years
In an alpha helix each amino acid will increase the length of the helix by about 0.15 nm, so
6.57*10^25 amino acids * 0.15 nm = 9.85*10^15 meters = 1 light year.
If you were to put all of your DNA
in a straight line it would be 20-30 billion km
long or about 130-200
AU (The AU is the distance between the earth and the sun).
10^13 cells * 2-3 meters of DNA per cell = 20-30 billion km
If you were to line up all of the RNA
in your body it would stretch 200-300 billion km
, which is 1,300-2,000 AU
, or roughly 7-11 light days
Humans are roughly 0.1% DNA, but about 1% DNA and since DNA and RNA are similar your RNA would stretch 10 times further than your DNA