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. The RP13 gene of chromosome 17 codes for a protein __________ .
A. involved in glucose transport
B. that is a component of hair and nails
C. involved in eye development
D. involved in the determination of personality
2. During the unfolding reaction of a helix, breakage of each hydrogen bond requires about 2kJ/mol. This implies hydrogen bonds are
A. much stronger in proteins than in water
B. not reformed with water
C. slightly weaker in proteins than in water
D. slightly stronger in proteins than in water
3. Which pyrimidine base contains an amino group at carbon 4?
A. Cytosine
B. Thymine
C. Uracil
D. Adenine
4. FeCl3 screening test for PKU detects
A. Phenyl alanine
B. Phenyl pyruvate
C. Phenyl acetate
D. Phenyl lactate
5. Aspartame is made up of
A. Aspartic acid and methionine
B. Asparagine and methionine
C. Asparagine and phenylalanine
D. Aspartate and phenylalanine
6. Ammonia is detoxified in brain into
A. Urea
B. Glutamine
C. GABA
D. Glutamate
7. Fluorescence means
A. Spontaneous illumination in dark
B. Release of longer wavelength light on absorbing light of short wavelength
C. Release of shorter wavelength light on absorbing light of longer wavelength
D. Release of equal wavelength light at constant rate
8. In the intestine, the dietary fats are hydrolysed by
A. triacylglycerol lipase
B. adenylate cyclase
C. pancreatic lipase
D. protein kinase
9. Which of the following is the best described glucogenic amino acid?
A. Lysine
B. Tryptophan
C. Valine
D. None of these
10. 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
11. Which of the following immune cells would have an especially low count in a patient with advanced AIDS?
A. Killer T lymphocytes
B. Helper T lymphocyte
C. B lymphocytes
D. None of these
12. 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
13. Which of the following represents a correct ordering of the events that occur during the respiration of glucose in the absence of O2?
A. Glycolysis; citric acid cycle; oxidative phosphorylation
B. Glycolysis; oxidative phosphorylation; citric acid cycle
C. Oxidative phosphorylation; citric acid cycle; glycolysis
D. Glycolysis; fermentation
14. Which of the following techniques was carried out by Nirenberg and Matthaei in 1961 to determine the first codon?
A. In vitro synthesis of a polypeptide using UUUUU
B. Labeled peptide binding to a ribosome
C. Mixed co-polymer mRNA synthesis
D. none of the above
15. In the entire human genome, coding DNA constitutes
A. 0.02
B. 0.1
C. 0.25
D. 0.4
16. Which of the following is the substrate for rate-limiting enzyme of polyamine biosynthesis?
A. Histidine
B. Cadaverine
C. Ornithine
D. Anandamide
17. Antibodies can be used
A. for the localization of proteins in the cell
B. for protein purification
C. to catalyze chemical reactions
D. all of the above
18. SH2 domains specifically bind to
A. phosphorylated serine residues
B. phosphorylated tyrosine residues
C. GDP
D. Ca2+
19. Which of these restriction enzymes produce blunt ends?
A. SaII
B. EcoRV
C. XhoI
D. HindIII
20. A kinase is an enzyme that
A. removes phosphate groups of substrates
B. uses ATP to add a phosphate group to the substrate
C. uses NADH to change the oxidation state of the substrate
D. removes water from a double bond
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