The source of a sound moves away from the listener. Listener has the impression that the source is _ in pitch and the frequency has_. A.) lower. Increased

B.) lower, decreased

C.) higher, decreased

D.) higher, increased

Most animal cell membranes have proteins that pump. ions out of the cell and potassium ions into this

When proteins are being produced by a cell, scientist say that the genes are question 2 options: activated turned off replicated deactivated

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.