When a population of organism eats another, how can each population as well as the ecosystem change?

Describe your dna model. which part do the straws represent? the pushpins? the paper clips and the black dots you made with the marker?

Which of the following describes what an activator an enhancer are

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?