Because each strand in the double helix acts as a template for synthesis of a new, complementary strand, DNA replication is said to be ?

Explain how organisms could be harmed by high levels of salt from roadways?

Explain why ecosystem diversity results in species diversity in a healthy biosphere

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.