Cholesterol , a substance that modifies the fluidity of membranes. A short piece of DNA , a nucleic acid, with five base pairs. Proteins A short polypeptide , or protein segment, from a gene-regulating protein. Others Biomolecules include many cofactors and prosthetic groups that overlap or extend beyond these four categories. To obtain PDB files of many of these substances, go to HIC-Up .
Exercises Carry out the following tasks with each of the models above.
At this stage, these are quite challenging exercises. Predict whether each substance is more soluble in water or in hexane. Identify the atoms involved in each hydrogen bond. Identify the functional groups present in each molecule. Add hydrogens to complete the models.