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20. Gas vacuoles are present in:
(A) Anabaena flos-aquae
(B) Bacillus subtilis
(C) Acanthurus nigrofuscus
(D) Mycobacterium tuberculosis
1 Answer 19. Molecular chaperones are a class of proteins that facilitate:
(A) the proper folding of newly synthesized proteins
(B) unfolding of newly synthesized proteins
(C) degradation of newly synthesized proteins
(D) targeting of newly synthesized proteins
1 Answer 18. The lipopolysaccharides present in bacterial cell wall has lipid A which is connected to:
(A) O-polysaccharide
(B) core polysaccharide
(C) both with O-polysaccharide and core polysaccharide
(D) rhamnose-mannose disaccharide
1 Answer 17. The study of evolutionary relationships is known as:
(A) genomics
(B) proteomics
(C) phylogenetics
(D) genetics
1 Answer 16. Wash out (as defined by D=max) of a continuous stirred tank fermenter is characterized by (X=biomass, S=substrate concentration in bioreactor, So=substrate concentration in feed, P=product concentration in bioreactor):
(A) X = 0, S = 0, P = 0
(B) X = 0, S = So, P = 0
(C) X =0, S < 0, P = 0
(D) X <0, S <0, P <0
1 Answer 15. Substrate consumption in lag phase of microbial growth is primarily used for:
(A) P, Q and S only
(B) Q, R and S only
(C) P, Q and R only
(D) S only
Where:
P. turnover of the cell material
Q. maintenance of intracellular pH
R. motility
S. increase in cell number
1 Answer 14. Restriction endonucleases which recognize and cut the same recognition sequences are known as:
(A) isoschizomers
(B) isozymes
(C) isoaccepting endonucleases
(D) abzymes
1 Answer 13. In N-linked glycosylation, the oligosaccharide chain is attached to protein by:
(A) asparagine
(B) arginine
(C) serine
(D) threonine
1 Answer 12. In balanced growth phase of a cell:
(A) P, Q and S only
(B) Q, R and S only
(C) P, Q and R only
(D) P only
Where:
P. all components of a cell grow at the same rate
Q. specific growth determined by cell number or cell mass would be the same
R. the growth rate is independent of substrate concentration
S. the growth rate decreases with decreasing substrate concentration
1 Answer 11. ‘Hairy roots’ induced in vitro by the infection of Agrobacterium rhizogenes are characterized by:
(A) P and R only
(B) P and Q only
(C) Q and R only
(D) R and S only
Where:
P. a high degree of lateral branching
Q. genetic instability of culture
R. an absence of geotropism
S. poor biomass production
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Sourav Pan
Sourav Pan
Sourav Pan
Sourav Pan
Sourav Pan
Sourav Pan
Sourav Pan