Using radio telescopes, astronomers have found evidence that no new matter is forming in the universe, which is
what the big bang theory predicted.
This work is part of which process used in developing scientific theories?
A. Using new technology to replace outdated theories with new ideas
B. Using new technology to provide additional supporting data
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C. Using imagination to spark new ideas
D. Using new data to modify an existing scientific theory
SUL

Lactase is essential for digesting lactose in milk. this enzyme is specific for this sugar. why? molecules and active sites vary in size; only properly sized molecules can fit. there is a precise compatibility between the active site and the lactose molecule. specificity refers to the action of the enzyme, such as hydrolysis, and relatively few molecules can be hydrolyzed. reaction-specific enzymes assume a fit by folding around the most numerous substrate molecules.