HEEP PLEAS WILL GIVE Why does ballast water pose a threat to the environment?
A. It uses precious fresh water resources.
B. It is full of oil and industrial chemicals.
C. It transfers wildlife to new ecosystems.
D. It causes ships to sink if not properly managed.

The fluid mosaic model of the membrane proposed that membranes

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.

How are viruses different from eukaryotic cells?