Which of these enzymes joins molecules together? (a) Hydrolases (b) Lyases (c) T

Question

Which of these enzymes joins molecules together? (a) Hydrolases (b) Lyases (c) Transferases (d) None of the above. The activity of an enzyme is the activity that transforms 1 mole of substrate amount of enzyme per milligram of protein (a) True (b) False Calculate the value of the equilibrium constant, K_c, for the system shown below, if 0.1908 moles of CO_2, 0.0908 moles 0,0092 moles of CO, and 0.0092 moles of H_2O vapor were present in a 2.00 L reaction vessel were present at equilibrium. CO_2(g) + H_2O(g) doubleheadarrow Co(g) + H_2O(g) (a) 4.88 times 10^-2 (b) 4.88 times 10^-3 (c) 4.88 times 10^-4 (d) 4.88 times 10^-6 (e) None of the above The enzyme which catalyzes glucose to fructose belongs to a group of enzymes known as (a) Lyases (b) Transferases (c) Isomerases (d) Reductases Which of these types of enzyme inhibition describes the situation where both the V_max and K_m changes? (a) Uncompetitive inhibition (b) Competitive inhibition (c) Non-competitive (d) None above An allosteric enzyme in which the modulator is a small molecule other than the substrate is called The DNA makes a copy of the gene and sends this over to the ribosomes using (a) mRNA (b) rRNA (c) tRNA (d) None of the above. Which of these ribonucleotides is not required for the synthesis of RNA? (a) CTP (b) GTP (c) TTP (d) ATP pKa is defined as The hydrogen ion concentration of an aqueous solution of 0.005M magnesium hydroxide is (a) 1 times 10^-10 (b) 1 times 10^-11 (c) 1 times 10^-13 (d) 2 times 10^-13 (e) None of the above (Bonus) Draw the complete reaction between 2 amino acids to form a dipeptide (Bonus).

Explanation / Answer

12) Ligase is the enzyme which joins two molecules

So here the answer will be none of the above

13) Enzyme activity is the moles of substrate converted per unit of time

The given acitivty in the question is specific activity, so answer is false

14) Keq = [CO][H2O] / [CO2][H2]

[CO] = 0.0092 /2 [concentration = Moles / volume]

[H2O] = 0.0092/ 2

[CO2] = 0.1908 / 2 =

[H2] = 0.0908 /2

Keq = [ 0.0092] [0.0092] / [0.0908][0.1908]= 0.00488 = 4.88 X 10^-3

15) Glucose and fructose are isomers so the enzyme will be isomerase

16) In non competitive inhibition both Vmax and Km changes

In competitive, Vmax unchnaged

In non competitive, Km unchanged

17) Heterotropic allosteric enzyme

18) t-RNA carry amino acids to the ribosomes during protein synthesis

19) TTP

20) pKa is minus antilog of dissociation constant

pKa = -logKa

Ka = dissociation constant

21) Mg(OH)2 ---> Mg+2 + 2OH-

[OH-] = 2 X 0.005 = 0.01 M

[H+][OH-] = 10^-14

[H+] = 10^-12 [None of the above]

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