Francis was recording plant heights for an experiment. each time that she took a measurement, she wrote it down. then, she measured the plant again and compared the new measurement to the one that she had recorded in her notebook. what was she most likely trying to do?
1. revise her hypothesis
2. check her memory
3. make the data more valid
4. form a conclusion

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.