Why is the improved synthesis of nucleotide triphosphates more environmentally benign? Check all that apply. reducing the chance for reacting molecules to collide eliminates the need for polymerase chain reaction making use out of a waste product (glycerol) removal of a hazardous solvent to lower waste and cost

Here’s a Ramachandran plot. Give the dihedral angles--phi and psi--that are characteristic of a left handed helix.

You study actin polymerization by monitoring the increase in fluorescence of pyrene-labeled actin.  Pyrene is a fluorescent molecule, which has very low level of fluorescence on its own or when fused to G-actin.  However, the pyrene fluorescence increases dramatically when pyrene-labeled G-actin is incorporated into a polymer.  In this assay, the amount of pyrene fluorescence is proportional to the amount of actin polymer. In the figure below, actin polymerization curves resulted for conditions listed below; assume that G-actin concentration is above the critical concentration for the pointed end and that ATP is present.  Which curve corresponds to which condition? Explain

Consider normal B-form DNA. It forms a regular antiparallel double-helical structure with Watson-Crick base-pairing mediated through hydrogen bonding. The base pairs all stack upon one another, with 3.4 Å spacing between them. DNA strands having a complementary sequence will spontaneously form a double-helix in an aqueous solution. In terms of energy, what primarily drives helix formation? O Positive Entropy from base stacking van der Waals interactions O Hoogsteen interactions Positive Enthalpy from Hydrogen Bonding between GC and AT pairs Negative Enthalpy from Hydrogen Bonding between GC and AT pairs O Negative Entropy from base stacking