The following is an excerpt from a recent scientific publication:“The pace and efficiency of drug target strategies have been emanating debates among researchers… Covalent inhibitors possess significant advantages over non‑covalent inhibitors, such that covalent warheads can target rare residues of a particular protein, thus leading to the development of highly selective inhibitors. However, toxicity can be a real challenge related to this class of therapeutics. From the challenges of irreversible drug toxicity to the declining reactivity of reversible drugs…” What selective advantage do covalent warheads confer in drug design, as described?

The following is an excerpt from a recent scientific publication:“Covalent inhibitors can achieve exquisite potency and durable target occupancy through a combination of covalent and noncovalent interactions. Drugs that possess a covalent mechanism‑of‑action encompass recent blockbusters (Clopidogrel) as well as early cornerstones of modern medicine (aspirin and penicillin). Despite this well‑documented history and the advantages from sustained target engagement, pharmaceutical companies have traditionally shied away from covalent drug programs due to concerns about potential idiosyncratic toxicity. However, clinical successes over the past decade (e.g. Ibrutinib), along with improvements in technologies used throughout the drug discovery pipeline, have reignited broad interest in this class of therapeutics.” What key advantage of covalent inhibitors is emphasized here in drug discovery?

Which base pairing feature underlies the genetic code’s redundancy during translation?

The following is an excerpt from a recent scientific publication:“Globular proteins have a core of hydrophobic amino acid residues and a surface region of water-exposed, charged, hydrophilic residues… Folding kinetics may trap a protein in a high-energy conformation … high-energy conformation may contribute to function… for example, the influenza hemagglutinin protein… two chains are held in a high‑energy conformation… when the local pH drops… conformation rearrangement enables it to penetrate the host cell membrane.” What structural feature contributes to hemagglutinin function?

Which base-pairing statement is correct for RNA and transcription?

The following is an excerpt from a recent scientific publication:“Amphetamine enters the presynaptic neuron … binds reversibly to TAAR1 or enters synaptic vesicles through VMAT2… When amphetamine reversibly binds to TAAR1, it reduces receptor firing rate … triggers signaling … result is transporter phosphorylation… transporters then operate in reverse…” What kind of interaction is primarily governing methamphetamine’s effects on transporter function?

A patient will be started on a continuous infusion of amiodarone at 0.5 mg/min. The nurse has 720 mg of amiodarone in a 500 mL bottle of D5W. What rate will the nurse program the infusion pump to deliver the amiodarone at 0.5 mg/min?

A salt bridge in a protein structure is best described as:

Which of the following species is the most nucleophilic in aqueous solution?

Which amino acid’s side chain can form a zwitterionic resonance-stabilized interaction in the active site of some enzymes?