Hominy grits, a regional delicacy of the southern United States, is made from co
ID: 915434 • Letter: H
Question
Hominy grits, a regional delicacy of the southern United States, is made from corn that has been soaked in a weak lye (NaOH) solution. What is the function of this unusual treatment? Which of the listed effects would be brought about by any enzyme catalyzing the following simple reaction? S P Where K' eq = [P]/[S] Decreased K' eq Increased k1 Increased K' eq Increased DeltaG : Decreased DeltaG :G More negative DeltaG' degree Increased K2 Carbonic anhydrase of erythrocytes (Mr 30,000) has one of the highest turnover numbers known. It catalyzes the reversible hydration of CO2: H2O + CO2 H2CO3 This is an important process in the transport of CO2 from the tissues to the lungs. If 10.0 mug of pure carbonic anhydrase catalyzes the hydration of 0.5 g of CO2 in 5 min at 37degreeC at Vmax, what is the turnover number (Kcat) of carbonic anhydrase (in units of min^-1)?Explanation / Answer
soaking of corn in lye helps in bioavailability of vitamin B3 ( also known as Niacin). the treatment also helps in Niacin easily be absorbed by the body.
2. The presence of catalyst ( in this case increases the rates of forward as well as backward reaction allowing equilibrium to establsih rapidly. Hence the rate constant for forward and backward reactions change witout affecting equilibrium constant. Sicne the equilibrium constant remain the same, the delG= -RTlnKeq, delG also will not change.
hence correct answers are ( a and g)
3, turn over number= Vmax/ Et
where Vmax, maximum rate = 0.5/5 g/min = 0.1 g/min
Et= Enzyme concentration =10*10-6g
turn over number = 0.1/(10*10-6) =1000 min-1
turn over number =0.1
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