Industrially Useful Microbial Processes
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The
first penicillin isolated by Alexander Fleming, penicillin F is also called____________.
a.
2-Pentenyl Penicillin
b.
n-heptyl penicillin
c.
phenoxymethyl penicillin
d.
benzyl penicillin
It
is mandatory that cultures and fermentation residues be sterilized before
discard in case of Eremothecium ashbyii and Ashbya gossypii because they are____________.
a.
Plant pathogens
b.
Human pathogens
c.
Plant mutants
d. None
of these
Which
of the following when used in proper concentration stimulates the Ascomycetes
fermentation of vitamin B12 and can be used to counteract toxicity of iron in
Candida species?
a.
Co
b. Ni
c.
Zn
d. Ca
Pectinase,
an enzyme used for increasing yield and for clarifying juice is obtained by____________.
a. A.
oryzae
b. A.
niger
c.
A.flavus
d.
All of these
The
95% ethanol is equivalent to____________.
a.
190 proof
b. 110
proof
c. 170
proof
d. 120
proof
The
organism B. brevis can be used commercially for the production of____________.
a.
Gramicidin A
b.
Tyrothricin(bacitracin tyrocidin complex)
c.
Tyrocidin
d.
All of the above
The
early assay employed for measuring penicillin activity were based upon the
quantity required to prevent growth of S. aureus over____________.
a. 20
mm diameter zone using the cylinder plate method of assay
b.
24 mm diameter zone using the cylinder plate method of assay
c. 200
mm diameter zone using the cylinder plate method of assay
d. None
of the above
Penicillin
G is also known as____________.
a.
Hydroxy benzyl penicillin
b.
Phenoxy methyl penicillin
c.
Benzyl penicillin
d.
2-pentenyl penicillin
A
major organic acid produced by a microbial process used in foods is____________.
a.
Sulfuric acid
b.
Citric acid
c.
Oxalic acid
d. Uric
acid
Which
species from the followings is resistant to methyl tryptophan?
a.
Candida utilis
b. E.
coli
c.
B. subtilis
d.
Hansenula anomala
Which
of the following was the first amino acid to be produced commercially?
a.
L-glutamic acid
b.
L-lysine
c.
L-cystine
d.
L-methionine
The
Candida species require fermentation equipment lined with plastic because they are
extremely sensitive to____________.
a.
Traces of cobalt
b.
Traces of nickel
c.
Traces of iron
d. None
of these
Cycloserine
may be isolated from the cultures of____________.
a. S.
orchidaceus
b. S.
lavendulae
c. S.
garyphalus
d.
All of these
Which
of the following substance is employed to neutralize the lactic acid as it is
produced (because lactic acid bacteria do not tolerate high concentrations of
acid?
a.
CaCO3
b.
(NH4)2 HPO4
c.
MgSO4
d.
Na2SO4
Which
of the following is not an industrial product made by the fungus Aspergillus
niger?
a.
Galactosidase
b.
Citric acid
c.
Gluconic acid
d.
Lysine
The
biotin level in obtaining L-gluatmic acid by fermentation using Micrococcus
glutamicus is critical because____________.
a. Too
low level prevents growths, hence L-glutamic acid production
b. Too
high level prevents L-glutamic acid production
c.
Both (a) and (b)
d. None
of the above
Most
productive species among the different vitamin B12 producing Pseudomonads is____________.
a.
P. denitrificans
b. P.
ovalis
c. P.
aureofaciens
d. none
of these
The
enzyme which converts optically active isomers of lactic acid to the optically
inactive racemic mixture is____________.
a.
Isomerase
b.
Racemase
c.
Dehydrogenase
d.
Invertase
The
sugar concentration of molasses used in fermentation should be____________.
a.
10-18%
b.
20-30%
c. 4-5%
d.
30-38%
Bacitracin,
an antibiotic similar to penicillin, is produced by____________.
a.
Bacillus polymyxa
b.
Streptomyces erythreus
c.
Bacillus licheniformis
d.
Aspergillus fumigatus
Which
of the following Ascomycetes are used for riboflavin production?
a.
Eremnothecium ashbyii
b.
Ashbya gossypii
c.
Candida guilliermondia
d.
Both (a) and (b)
Alcohol
production from starch and raw sugar utilizes selected strains of
____________.
a.
Saccharomyces cerevisiae
b.
Candida pseudotropicalis
c.
Candida utilis
d. none
of these
Fungal
amylases using stationary culture with wheat bran utilizes____________.
a.
A. oryzae
b. A.
niger
c. A.
flavus
d. S.
cerevisiae
Why
high concentration of sugars are not employed in the fermentation medium?
a.
Calcium lactate is not produced
b.
Calcium lactate crystallizes from the medium and slows down the process of
fermentation
c. High
sugar concentration itself crystallizes
d. None
of the above
Which
of the following organism produces enzyme taka diastase?
a.
A. oryzae
b. B.
subtilis
c. A.
niger
d. S.
cerevisiae
B.
flavum strain can be used for the production of____________.
a.
L-Threonine
b.
L-Proline
c.
L-Isoleucine and L-Histidine