Which of the following statements concerning protein structure is/are incorrect?
a) the primary structure consists of a chain of amino acids joined by peptide bonds.
b) the secondary structure consists of a twisting or folding of the peptide chai.
c) the tertiary structure refers to the three dimensional shape of the protein.
d) the quaternary structure is present in all proteins and consists of the combination.
e) of several polypeptide chains.

answer; the correct answer is conflict- related aggression; +

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.

the generally accepted parts of modern cell theory include: all known living things are made up of one or more cells. all living cells arise from pre-existing cells by division. the cell is the fundamental unit of structure and function in all living organisms.