Which statement is correct about the Michaelis-Menten constant, Km, for the kinetic mechanism below?   a.  It is numerically equal to the substrate concentration required to achieve one half the maximum velocity.   b.  Its defined as Km = k1/(k−1 + k2).   c.  It is approximately equal to the dissociation constant for the enzyme-substrate complex to E + P.   d.  The value of Km is constant for an enzyme regardless of the specific substrate molecule used to determine it.   e.  Its numeric value has the units of moles−1.

All are catalytic mechanisms or factors that contribute to the performance of enzymes EXCEPT:   a.  entropy gain in ES formation.   b.  covalent catalysis.   c.  general acid or base catalysis.   d.  proximity and orientation.   e.  all are true.

All are characteristic of allosteric enzymes EXCEPT:   a.  Effectors may show stimulatory or inhibitory activity.   b.  They have multiple subunits.   c.  They obey Michaelis-Menten kinetics.   d.  The regulatory effect is by altering conformation and interaction of subunits.   e.  Binding one subunit impacts binding of substrate to other subunits.  

What two enthalpic factors stabilize DNA in double-helical form at low temperature?

Calculate the velocity of a reaction of a substrate at 20 mM if Vmax = 100 μmol/mL‧sec and Km = 2 mM 

An enzyme with a total concentration of 2 X10-10 mol/L working at Vmax catalyzes the conversion of substrate into product with a rate of 25 X10-6 mol of product per minute.  What is the enzyme’s turnover number?  

Cabotage laws require the intracoastal and intercoastal traffic in the US be carried in U.S. built and registered ships.

Which of the following best describes a motif?

Considering the price elasticity of transportation, the competitive impact of a price increase for a specific transportation company can be very significant.

When transportation cost is reduced by one half, the relevant market area for a company is quadrupled. This is referred to as: