how many dna molecules would there be after four rounds of pcr if the initial reaction mixture contained two molecules?

An atomic nucleus is composed ofa)protons.b)protons and neutrons.c)protons and electrons.d)protons, neutrons, and electrons.

Ascientist conducted an experiment and discovered that certain plants grow faster when given a particular amount of fertilizer. anouther scientist conducted the same experiment and got similar results. which concept does this best illustrate? a) repetition b) replication c) precision d) validity

Why does ammonia, nh3, behave as a base when it reacts with an acid? z