Achange in the order of dna bases code for a respritory protein will most likely cause?

When does dna replication(make a copy of itself)?

Animal bodies (and even plant bodies for that matter) are complex enough that life couldn't exist without enzymes. enzymes are usually large, complex biological catalysts that are expensive to make. enzymes speed up the rate of chemical reactions without being used up during the reaction (they can be reused many times). they are highly specific in the reactions they regulate. knowing what enzymes are and how they function, why does this explain why complex life forms could not exist if there were no enzymes.

All individuals have two alleles for a given trait. according to mendel's these alleles are passed down one each from both mother and father.