Protein denaturation results in a disruption
of the secondary and tertiary structure.
A denatured protein does not have the function it previously had. Some
proteins owe their functions to the three dimensional shape they have; what is
responsible for holding the shape of a protein is the R-group interactions.
Your question is rather unclear but from what I can tell either there were not an even amount of Petri dishes or some of them were left open while others were not.
