The first model of enzyme action was proposed in 1894 by emil fischer. in this model, the lock is the enzyme and the key is the substrate. only the correctly sized key (substrate) fits into the key hole (active site) of the lock (enzyme). much later, in 1958, the induced fit model was suggested by daniel koshland. the induced-fit theory assumes that the substrate plays a role in determining the final shape of the enzyme and that the enzyme is partially flexible. this explains why certain compounds can bind to the enzyme but do not react because the enzyme has been distorted too much. which model best represents the newer version of the enzyme action model?

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1. true.2. true.3. true.4. false.5. true.the concept of darwin's theory of evolution involves the idea that there are limited resources in a given living environment and that the organisms which live within have variations in their genetic make up due to random mating. the ones with beneficial genetic variations can express certain traits which give them an upper hand in surviving and reproducing in the said environment compared to ones who may have a more disadvantageous variation in traits. over time, the organisms with an upper hand will survive and reproduce more frequently and pass on their beneficial genes while the others die. the result is evolution, where we observe (usually, but not always) eventually, phenotypic distinct changes.