A fresh set of 20 random questions is generated every time you open this page and every time you refresh it.For each of the following multiple choice questions, choose the most appropriate answer :
1. Unpaired H-bond donors and acceptors are found in the hydrophobic core of a protein
A. only at the ends of a-helices
B. only at the turns connecting p-strands
C. only on Pro residues
D. rarely
2. Which of the following two organelles look most alike structurally?
A. Nucleus and vesicle
B. Golgi apparatus and smooth endoplasmic reticulum ER
C. Vacuole and cytoskeleton
D. Lysosome and chloroplast
3. Individuals with PKU disease are mentally retarded unless
A. phenylalanine in the diet is restricted
B. tyrosine in the diet is restricted
C. homogentisic acid in the diet is restricted
D. none of the above
4. In Counter immunoelectrophoresis
A. electrophoresis will drive the antibody and antigen parallel to each other
B. electrophoresis will drive the antibody and antigen toward each other
C. the antibody will migrate towards anode
D. the antibody will migrate towards cathode
5. In postprandial state, which of the following amino acid is extracted predominantly by muscle, having been spared by the liver?
A. Alanine
B. Valine
C. Glutamate
D. Glutamine
6. Enzyme defective in Tyrosinemia Type I is
A. Fumaryl acetoacetate hydrolase
B. Tyrosine amino transferase
C. Para hydroxyl phenyl pyruvate hydroxylase
D. Para hydroxyl phenyl pyruvic acid oxidase
7. The general expression for the appearance of a solute in an effluent is (where V is the elution volume of a substance , V0 void volume, kD distribution constant and Vi internal water volume)
A. V = V0 + kDVi
B. V = V0/Vi
C. V = V0 - kDVi
D. V/V0 = kDVi
8. If the Standard Gibb's free energy, ?G°, for a reaction is positive then
A. the products will be favored
B. the reactants will be favored
C. the concentration of the reactants and products will be equal
D. all of the reactant will be converted to product
9. Guthrie’s bacterial inhibition test for PKU detects
A. Phenylalanine
B. Phenylpyruvate
C. Phenyl lactate
D. All of these
10. The molecular formula for glycine is C2H5O2N. What would be the molecular formula for a linear oligomer made by linking ten glycine molecules together by condensation synthesis?
A. C20H50O20N10
B. C20H32O11N10
C. C20H40O10N10
D. C20H68O29N10
11. In reverse phase chromatography, the stationary phase is made
A. non-polar
B. polar
C. either non-polar or polar
D. none of these
12. Enzyme-driven metabolic pathways can be made more efficient by
A. concentrating enzymes within specific cellular compartments
B. grouping enzymes into free-floating, multienzyme complexes
C. fixing enzymes into membranes so that they are adjacent to each other
D. All of the above
13. The enzyme common to both glycogenolysis and glycogenesis is
A. Glycogen phosphorylase
B. Glycogen synthase
C. Glucotransferase
D. Carboxykinase
14. Insulin like fructans are used as prebiotics as they are non digestible. Resistance to digestion in the upper GI tract results from:
A. Absence of Digestive enzyme in the upper GIT
B. Beta configuration of anomeric C2
C. Low pH of the stomach
D. Presence of alpha-osidic linkages
15. Hydrolysis occurs at which step of urea cycle
A. Cleavage of arginine
B. Formation of Argininosuccinate
C. Formation of citrulline
D. Formation of fumarate
16. Which of the following is the best described glucogenic amino acid?
A. Lysine
B. Tryptophan
C. Valine
D. None of these
17. 3-phosphoglycerate is the precursor molecule in the synthesis of
A. Aspartate
B. Proline
C. Serine
D. Threonine
18. NADP+ is reduced to NADPH during
A. light dependent reactions
B. photorespiration
C. calvin cylcle
D. none of these
19. Which of the following forces is the most favorable for protein folding?
A. Conformational entropy
B. Hydrophobic Interactions
C. Vander Waals interactions
D. Hydrogen bonds
20. HDLs are synthesized in
A. blood
B. liver
C. intestine
D. pancreas
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