What is not true about ionic bonds? They have low melting points, they conduct electric current when dissolved in water, they form hard brittle crystals

Explanation:

This is because ionic bonds have high melting point because they are held together by strong electrostatic force which hold the opposite charges together. This make the lattice to have lot of ions and alot of energy is required to overcome it, hence they have high melting and boiling points.

Ionic bond is a bind that have electrostatic attraction between atoms of opposite ions.

i think it's c

c.) polymerase chain reaction

- "unlike the original dna fingerprinting method, dna profiling does not use restriction enzymes to cut the dna. instead it uses the polymerase chain reaction (pcr)? to produce many copies of specific str sequences. pcr is an automated procedure that generates lots of copies of a specific sequence of dna."