Test Your Knowledge - Free MCQ PRACTICE
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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. Why must the radiation source for fluorescence spectrometry be more powerful than for absorption spectroscopy?
A. Because the magnitude of the output signal is proportional to the power of the incident radiation
B. Because the sample won't fluoresce if the incident radiation is of low power
C. To allow for scattering by the sample
D. None of the above

2. Enzymes of irreversible steps in the glycolysis?
A. Hexokinase, Pyruvate kinase, Phosphofructokinase
B. A
C.
D. Hexokinase, Pyruvate kinase, 1,6 biphospho-fructokinase

3. In the past, IR spectra had to be aquired one wavelength at a time, which took a long time. Today quick spectra is due to the
A. the Fourier Transfer Algorithm allows us to scan all frequencies at once
B. light is faster today that it used to be
C. absence of broad spectrum of wavelenth
D. none of the above

4. Sphingomyelinase deficiency is seen in:
A. Niemann - pick disease
B. Farber's disease
C. Tay Sach's disease
D. Krabbe's disease

5. 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

6. For the unfolding reaction of Protein G, ?H =210.6 kJ/mol, this means that
A. unfolding is favored enthalpically
B. folding is favored enthalpically
C. the entropy is positive at all temperatures
D. the entropy is negative at all temperatures

7. What is used to cool the superconducting coil?
A. Hydrogen
B. Ice
C. Dry ice
D. Liquid helium

8. Plasma cells produce thousands of __________ that are released into the bloodstream
A. antigens
B. antibodies
C. helper T cells
D. virus fragments

9. What is a protein produced by host cells infected by viruses?
A. Interferon
B. Histamine
C. Antiserum
D. Vaccine

10. Tetrahydrobiopterin is required for the metabolism of
A. Arginine
B. Lysine
C. Phenylalanine
D. Serine

11. The Hill coefficient (nH) for myoglobin and hemoglobin are respectively
A. 2.8 and 1.0
B. 1.0 and 2.8
C. 1.2 and 4.5
D. 4.5 and 1.2

12. Methylation of cytosine leads to
A. Increased expression of gene
B. Decreased expression of gene
C. No effect on gene expression
D. Mutation

13. Long-chain fatty acids are oxidized step-wise in one carbon units starting from the
A. carboxyl end
B. aliphatic end
C. both (a) and (b)
D. none of these

14. Which of the following is the substrate for rate-limiting enzyme of polyamine biosynthesis?
A. Histidine
B. Cadaverine
C. Ornithine
D. Anandamide

15. The isoelectric point of an amino acid is defined as the pH
A. where the molecule carries no electric charge
B. where the carboxyl group is uncharged
C. where the amino group is uncharged
D. of maximum electrolytic mobility

16. If more than one codon codes for same amino acid, this phenomenon is known as
A. Degeneracy
B. Frame-Shift Mutation
C. Transcription
D. Mutation

17. Triacylglycerols are
A. soluble in water
B. insoluble in water
C. soluble in water at elevated temperature
D. partially soluble in water

18. 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

19. Very low doses of antigen may induce
A. hypersensitivity
B. immunological ignorance
C. low zone tolerance
D. low zone immunity

20. 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

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