How might a change of one amino acid at a site, distant from the active site of an enzyme, alter the substrate specificity of an enzyme? by changing the optimum ph for the enzyme by changing the stability of the enzyme by changing the binding site for a noncompetitive inhibitor by changing the three-dimensional conformation of the enzyme?

Average annual precipitation and are the two major features that define the biomes on earth.

Provide one reason why mitosis occurs.

Which is an advantage of having memory cells when a pathogen is encountered for a second time. a) the memory cells are what proliferate into clones of cells in response to the binding of an antigen. b) memory cells are vital to the primary immune response in that they immediately recognize pathogens even at the first encounter. c) memory cells are essentially effector cells that are short lived and attack antigens even without having a receptor specific to that antigen. d) it ensures that more lymphocytes with a receptor specific to a particular antigen will be present than in a host that had never encountered that pathogen.