The circulatory route through a lymphoid tissue for both immature b cells and mature b cells that do not encounter specific antigen is

Look at the punnett square for an x-linked recessive disease. is it possible for a female offspring to have the disease?

Dna is always read in the whereas rna is read in .

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.