Which of the following undergoes change during a chemical reaction?

a. atomic masses of elements in reactants
b. element identities of atoms in reactants
c. total number of electrons in reactants
d. chemical bonds between atoms in reactants

If the coding part of an mrna molecule is 1800 nucleotides (bases) in length, this molecule will contain codons and code for a polypeptide that is amino acids long.

How did alexander fleming’s research solve a societal problem? he developed ways to treat inherited diseases. he advocated for regular hand washing to kill germs. he discovered a new type of medicine that could treat infections. he discovered the cause of mad cow disease, an emerging disease.

What is the difference between a meteoroid and a meteor?