Blog

Which amino acid side chain is best suited to anchor a transmembrane helix in a lipid bilayer via hydrophobic interactions?

What is the dominant type of noncovalent interaction between the side chains of phenylalanine and tryptophan in a folded protein?

The following is an excerpt from a recent scientific publication:“In this study, we adopted the fragment‑based drug design approach … to extract noncovalent and covalent fragments according to distinct 3D interaction modes … we recombined BTK‑focused libraries, and 23 compounds within our libraries have been validated … provides valuable resources for virtual screening of covalent and noncovalent drugs targeting similar molecular targets.” For a kinase target like BTK, what is the advantage of combining covalent and noncovalent fragments in library design?

The following is an excerpt from a recent scientific publication:“We will then use this understanding of protein structure at the atomic level to describe how the precise shape of each protein molecule determines its function in a cell. Proteins are therefore known as polypeptides. Each type of protein has a unique sequence… We start this paper by considering how the location of each amino acid… determines its three‑dimensional shape… precise shape of each protein molecule determines its function in a cell.” What essential principle is emphasized by this excerpt?

Which structural feature most directly explains cooperativity in hemoglobin but not in myoglobin?

Which statement about DNA strands is correct?

Which of the following side chains can act as a buffer near physiological pH due to its imidazole group?

Which of the following functional groups is most basic?

The following is an excerpt from a recent scientific publication:“Specific noncovalent interactions that are indicative of attractive, directional intermolecular forces have always been of key interest to medicinal chemists in their search for the ‘glue’ that holds drugs and their targets together. … we survey … three kinds of strong, specific, direct, enthalpy‑driven intermolecular forces, including hydrogen bond, halogen bond and salt bridge, involved in the formation of protein‑ligand complex architecture … biological functions … in conferring affinity and specificity for ligand recognition by host protein.” Which interactions are highlighted here as enthalpy‑driven contributors to affinity and specificity in drug design?

Which of the following is a reversible, weak interaction often involved in enzyme-substrate binding?