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Enzymes are proteins that catalyze (that is, increase or decrease the rates of) chemical reactions in enzymatic reactions, the molecules at the beginning of the process are called substrates, and they are converted into different molecules, called the products almost all processes in a biological cell need enzymes to occur at significant rates. Start studying biology - enzymes learn vocabulary, terms, and more with flashcards, games, and other study tools. Bio 10 - biology lab tuesday: 15:00 hours to 17:50 hours photosynthesis definition: form in the presence of appropriate enzymes. Topics covered include classification, ecology, energy in biomass, diffusion and osmosis, the cell, nutrition in plants, enzymes, digestive system, nutrients for humans, respiration, transport in humans, transport in plants, excretion, homeostasis, movement, plant reproduction, reproduction in humans, reproduction in humans and reproduction and cloning.Download