Question

1. When methane gas is burned in the presence of diatomic oxygen gas, which type of oxidation or reduction reaction is occurring?

A. the oxygen atoms in diatomic oxygen gas are being oxidized

B. the carbon atoms in methane gas are being reduced

C. the hydrogen atoms in methane gas are being reduced

D. the oxygen atoms in water are being oxidized

E. the carbon atoms in methane are being oxidized

2. S-adenosylmethionine is an activated carrier molecule that transfers which of the following groups?

A. the carboxylic acid group (with one carbon)

B. the phosphate group (with zero carbons)

C. the glucose group (with six carbons)

D. the methyl group (with one carbon)

E. the acetyl group (with two carbons)

3. If the enzyme maltase has a V_o of 0.25 mM per minute when [S] = 0.10 mM, and a V_o of 0.40 mM per minute when [S] = 0.40 mM, what is its V_max?

A. 0.10 mM per minute

B. 0.20 mM per minute

C. 0.50 mM per minute

D. 1.0 mM per minute

E. 2.0 mM per minute

4. Calculate the K_m of the above enzyme.

A. 0.10 mM

B. 0.20 mM

C. 0.50 mM

D. 1.0 mM

E. 2.0 mM

5. Calculate the slope on a Lineweaver-Burk plot (K_m / V_max) for the above enzyme.

A. 0.10 per minute

B. 0.20 per minute

C. 0.50 per minute

D. 1.0 per minute

E. 2.0 per minute

6. If inhibitor X changes maltase activity to a V_o of 0.10 mM per minute when [S] = 0.125 mM, and a V_o of 0.25 mM per minute when [S] = 0.50 mM, calculate the new V_max.

A. 0.10 mM per minute

B. 0.20 mM per minute

C. 0.50 mM per minute

D. 1.0 mM per minute

E. 2.0 mM per minute

7. Calculate the K_m of the maltase reaction with inhibitor X.

A. 0.10 mM

B. 0.20 mM

C. 0.50 mM

D. 1.0 mM

E. 2.0 mM

8. Calculate the slope on a Lineweaver-Burk plot (K_m / V_max) for the maltase reaction with inhibitor X.

A. 0.10 per minute

B. 0.20 per minute

C. 0.50 per minute

D. 1.0 per minute

E. 2.0 per minute

9. Which of the following Lineweaver-Burk parameters does not change when inhibitor X is added to the maltase reaction?

A. the slope of the line does not change

B. the V_max does not change

C. the K_m does not change

D. all of the above

E. none of the above

10. Inhibitor X exerts which of the following effects on the above enzyme (maltase)?

A. competitive inhibition

B. pure non-competitive inhibition

C. uncompetitive inhibition

D. all of the above

E. none of the above

Answer 1

Ans:-1) oxidation is the loss of electrons or an increase in oxidation state by a molecule, atom or ion.

Reduction is the gain of electrons by or decrease in oxidation state by a molecule, atom or ion.

The carbon in the methane has lost 8 electrons. So this is the oxidation reaction and methane is reducing agent. The oxygen has gained 8 electrons. So this is reduction reaction and oxygen is reducing agent.

CH4(g) + 2 O2 (g) - - - - - - - - - > CO2 (g) + 2H2O(g)