Many globular proteins contain a segment of amino acids that is extended (stretched out) and after making a U-turn binds with itself. This is one kind of Beta pleated sheet known as antiparallel. Instead of H bonds assisting in forming a spiral (as in an alpha helix), H bondsexist between […]

1. Both strands of DNA serve as templates concurrently in A. replication B. excision repair C. mismatch repair D. none of these 2. Proofreading activity to maintain the fidelity of DNA synthesis A. occurs after the synthesis has been completed B. is a function of the 3′-5′ exonuclease activity of […]

Questions (i) How might the inclusion of tetracycline in triple therapy for gastric ulcers be problematic? (ii) Considering EACH of the portions of the tigecycline derivatives X and Y (shown), give the correct order of basicity for EACH nitrogen therein. (iii) Briefly discuss the utility of tigecycline as a treatment […]

Q1. What basic similarities among mammals and differences between mammals (the ingroup) and reptiles (an outgroup) help support the hypothesis that all mammals share a common ancestor? Q2. A person is to be fitted with bifocals. She can see clearly when the object is between 43 cm and 1.5 m […]