In model 1 the original amino acids are combined through a condensation reaction to make the dipeptide. a. what does r1 represent in the dipeptide?

Dipeptide is formed when two amino acids are joined together by a chemical bond called peptide bond. R group or "variable group" represents the side chain on the amino acid and this distinguishes the variety of a certain amino acid among others. For example, in the glycine-valine dipeptide, glycine has hydrogen as side chain while valine has isopropyl as side chain.

The density of water is 1 g/cm cubed and in order for the pebble to sink its density has to be greater than the density of water and in order for the twig to float its density has to be less than the density of water

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