The protein molecules in many foods provide the amino acids required for cells to produce new proteins. To determine whether a sample contains protein, Biuret solution is used. Biuret solution contains copper ions. In the absence of proteins, it is blue in color. However, when proteins are present, the chemical state of the copper ion causes them to form a chemical complex with the pep tide bonds between amino acids, changing the color of the solution. In the presence of short peptides, the solution will turn pink, and in the presence of long polypeptides, the solution will turn violet.

Record your hypothesis about what will happen when Biuret solution is mixed with the solutions from test tubes 1, 2, 3, and 4 here. Be sure to use scientific reasoning to support your hypothesis..

he forelimbs below belong to four species that descended in a direct line from the ancestral mammal shown above. of the four descendants shown, which species most likely appeared earliest in evolutionary history?

answers are:

lysogenic     viral dna merges with host cell dna

lysogenic     no symptoms

lytic               viral dna takes over

lysogenic     virus does not destroy host cell

lytic               virus destroys host cell

lytic               induces symptoms of viral infection

lysogenic       cell reproduces and spreads provirus

the alkaline earth metals (beryllium (be), magnesium (mg), calcium (ca), strontium (sr), barium (ba), and radium (ra)) are a group of chemical elements in the s-block of the periodic table with very similar properties: shiny. silvery-white. hopefully this ? i didn't fully understand the question