What enzyme is coded for in the chromosome of bacteria?

a: glucose

b: galactose

c: lactose

d: beta-galactosidase

What is a metal replacement reaction

Sally is making a model of a magnesium atom with an atomic mass number of 24 for her chemistry class. she has foam balls for the protons, neutrons, and electrons. she has added 6 neutrons to her model so far. how many more neutrons does she need to add to complete her neutral atom of magnesium?

Helium decays to form lithium. which equation correctly describes this decay?