What name is given to elements with the same number of protons but differing numbers of neutrons? ions acids isotopes bases

Gene expression is the activation of a gent that results in a question 1 options: protein dna mitochondria

How do the sperm cells get from the stigma to the ovules?

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.