Biochemistry Practice Test 7

1. What is the necessary coenzyme for transamination reactions?

Coenzyme A

Pyridoxal phosphate

NAD

Thiamine pyrophosphate

2. Metabolic control analysis does not suggest that ___________

When the blood glucose level rises, insulin acts in muscle to induce the synthesis of hexokinase

When the blood glucose level rises, insulin acts in muscle to increase glucose transport into cells by bringing GLUT4 to the plasma membrane

When the blood glucose level rises, insulin acts in muscle to activate glycogen synthase by covalent alteration

When the blood glucose level rises, insulin acts in muscle to induce the synthesis of PFK-1

3. Long-chain fatty acids are oxidized step-wise in one carbon unit starting from ____________

Carboxyl and Aliphatic end

Carboxyl end

Aliphatic end

None of the mentioned

4. If 2, 4-dinitrophenol is added to tightly coupled mitochondria that are actively oxidizing succinate ____________

Electron flow will continue but ATP synthesis will be increased

Electron flow will cease but ATP synthesis will continue

Electron flow will continue but ATP synthesis will not occur

Both electron flow and ATP synthesis will be ceased

5. Nitrogen atoms of urea produced in the urea cycle are derived from ___________

Ammonia and aspartic acid

Ammonia

Nitrate

Nitrite

6. Effect of valinomycin on oxidative phosphorylation does not involve _____________

Net yield of ATP decreases

Rate of oxygen consumption increases

Rate of flow of electrons increases

pH gradient across the inner mitochondrial membrane decreases

7. The proposal of the chemiosmotic hypothesis was by ____________

Alfred Russell

Peter D. Mitchell

Mendele

Charles Darwin

8. Which of the following is a measure of the effect of an enzyme’s concentration on flux through a multi-enzyme pathway?

Response coefficient

Flux control coefficient

Metabolic control

Elasticity coefficient

9. Typically how many copies of DNA is/are there in each mitochondrion?

10. The combined action of aminotransferase and glutamate dehydrogenase is referred as ___________

Transdeamination

Oxidative deamination

Transamination

Reductive deamination