A single gene mutation would most likely occur if 1.
messenger-RNA molecules temporarily bond to DNA molecules
2.
the cytoplasm lacks the amino acids necessary to synthesize a certain polypeptide
3
a base sequence in a DNA molecule is changed
4
transfer-RNA molecules do not line up properly on a messenger-RNA molecule

in a chemical reaction, the atoms and molecules produced by the reaction are called products. no new atoms are created, and no atoms are destroyed. in a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.

not always but somethings can be reproduced in a laboratory.

dna is a set of a gene held together by a chemical bond