Which of the following is an allosteric enzyme which serves as a control point in the citric acid cycle?

a. fumarase

b. succinate dehydrogenase

c. citrate synthetase

d. malate dehydrogenase

answer:

a fumarase

explanation:

number of molecules / avogadro's number * molecule molecular = mass

explanation:

we define a gram-molecular weight as the mass of one mole of any element or compound. a mole contains avogadro's number of units (molecules) –  

6.022

x

10

23

. so, dividing the number of molecules by avogadro's number gives us the number of moles. multiplying that by the molecular weight gives us the mass. from the periodic table we find the gram-molecular weight of u to be238 and of f to be19. so,  

u

f

6

will have a gram-molecular weight of 352g.