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. Arachidonate has 20 carbon atoms with
A. 3 double bonds
B. 2 double bonds
C. 4 double bonds
D. 8 double bonds
2. Hydrolysis occurs at which step of urea cycle
A. Cleavage of arginine
B. Formation of Argininosuccinate
C. Formation of citrulline
D. Formation of fumarate
3. Which of the following enzymes does not participate in oxidation reduction reaction?
A. Dehydrogenase
B. Peroxidases
C. Hydroxyperoxidase
D. Oxygenase
4. Which of these effects result from slow injection of a large sample volume?
A. Increased resolution
B. Decreased resolution
C. Non-linear detector response
D. Constant resolution
5. How many molecules of acetyl-CoA are produced in oxidation of palmitic acid (C16), which involves seven rounds of oxidation?
A. 6
B. 7
C. 8
D. 9
6. Cleavage of an IgG molecule by a specific protease can produce
A. an antigen-binding site and two constant regions
B. two heavy chain-light chain dimers
C. an inactive mixture of oligopeptides
D. two Fab fragments and one Fc fragment
7. Which of the following amino acids is considered as both ketogenic and glucogenic?
A. Valine
B. Tryptophan
C. Lysine
D. None of these
8. Sex lethal (sxl) in Drosophila is transcribed when
A. the X autosome balance is less than 0.5
B. the X autosome balance is 1 or greater
C. the X autosome balance equals 0.5
D. none of the above
9. 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
10. FeCl3 screening test for PKU detects
A. Phenyl alanine
B. Phenyl pyruvate
C. Phenyl acetate
D. Phenyl lactate
11. If the enthalpy change for a reaction is zero, ?G° is equal to
A. T?S°
B. -T?S°
C. -?H°
D. lnKeq
12. A nicked RNA molecule can be ligated by
A. T4 RNA ligase
B. DNA polymerase
C. T4 DNA ligase
D. all of these
13. Affinity chromatography deals with the
A. specific binding of a protein constituents for another molecule
B. protein - protein interaction
C. protein - carbohydrate interaction
D. none of the above
14. Why is it advantageous to record many FID signals from the same sample and then add them together?
A. To ensure that all target nuclei in the sample have been excited
B. To remove inaccuracies caused by fluctuations in the applied magnetic field
C. To increase sensitivity
D. None of the above
15. In FT-NMR, how are nuclei excited?
A. By radio-frequency radiation whose frequency is swept across a predetermined range
B. By an intense pulse of radiation which contains a wide range of frequencies
C. By an intense pressure
D. None of the above
16. In isoelectric focusing, proteins are separated on the basis of their
A. relative content of positively charged residue only
B. relative content of negatively charged residue only
C. size
D. relative content of positively and negatively charged residue
17. Which of the following is used as carbon atom source while producing urea in the urea cycle?
A. Arginine
B. Aspartic acid
C. Carbon dioxide
D. Glucose
18. Signal sequences are part of a protein that
A. signal folding of the protein
B. signal the protein synthesis on the ribosomes is ended
C. transport proteins to other sites within the cell
D. refold proteins in prion-associated diseases
19. The carbon dioxide is primary a product of
A. Krebs cycle
B. glycolysis
C. electron transport phosphorylation.
D. lactate fermentation.
20. In the intersystem crossing
A. the spin of an excited electron reverses, changing the state of the molecule (from singlet state to triplet state or vice versa)
B. a molecule converts its excess energy to light, and emits a photon
C. a molecule converts excess electronic energy to vibrational energy
D. all of the above
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