All organic molecules contain: A) carbon and hydrogen B) carbon, hydrogen, and oxygen C) carbon, hydrogen, and nitrogen D) carbon, hydrogen, oxygen, and nitrogen E) carbon, hydrogen, oxygen, nitrogen, and phosphorus The peptide bonds that link amino acids together in a protein are formed through which process? A) dehydration synthesis B) peptidation C) glycosylation D) acidic attack E) Diels-Alder reactions The inner shell of electrons of an atom contains two electrons when full. How many electrons are needed to fill the next electron shell? A) 2 B) 4 C) 6 D) 8 E) it cannot be filled Cellulose and glycogen differ from each other in what way? A) different sugar content B) different amino acids C) different ester linkages D) different glycoside linkages E) the difference is based only on whether they are from plants or animals How many covalent bonds does a nitrogen atom usually form? A) 1 B) 2 C) 3 D) 4 E) 5 From what are enzymes composed? A) carbohydrates B) nucleic acids C) lipids D) polysaccharides E) proteins