There is one position in the signature sequence that can be occupied by any amino acid, although one amino acid appears much more often than any other. What is this variable position

Embryos of different species look very similar, which shows that the organisms share a ancestor.

The content of manganese (mn) in steel was determined spectrophotometrically and with the use of the standard addition method. an unknown sample of mn from a digested steel sample gave an absorbance of 0.185 when analyzed spectrophotometrically. when 5.00 ml of solution containing 95.5 ppm mn was added to 50.0 ml of the unknown steel solution (digested sample), the absorbance was 0.248. calculate the concentration, in parts-per-million (ppm), of mn in the digested steel sample solution.

In the space, show a correct numerical setup for calculating the number of moles of co2 present in 11 grams of co2