Which of the following is the least likely mechanism for reducing the rate of gene transcription by a repressor? the repressor binds directly to the rna polymerase to block the closed-to-open transition at initiation. the repressor induces a conformational change in the polymerase that accelerates the closed-to-open transition. the binding of the repressor sterically occludes binding of the rna polymerase to the promoter?

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.

In some plants, pointed leaves (p) are dominant over rounded leaves (p). a plant with a genotype of pp

Which element forms the basis of all organic organisms a carbon b oxygen c hydrogen d nitrogen