Homologous structures in organisms suggest that the organisms:
have a common ancestor
must have lived at different times
have a skeletal structure
are now extinct

Which enzyme is responsible for “unzipping" the dna by breaking the hydrogen bonds between the nucleotides?

You are studying a protein that you call protein x. there is an aspartic acid at a key position in protein x which is important in the folding and stabilization of that protein. if this aspartic acid is changed to a different amino acid, which type of amino acid substitutions is most likely to allow the protein to fold normally?

Which major eukaryotic lineages form the bikonta, a monophyletic group characterized by two flagella as a synapomorphy?