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a package of histones with dna wrapped around them forms spherical structures called

normal human body cells contain how many chromosomes?

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.

Body systems are not completely independent they integrate and work together describe one example of the integration between body systems

The reactions that occur in the ribosome, where amino acids are combined to form proteins are anabolic or catabolic?