Can a mutation be beneficial to an organism

What element is able to combine with itself and hydrogen to form large molecules ?

Describe your dna model. which part do the straws represent? the pushpins? the paper clips and the black dots you made with the marker?

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.