451.
The conversion plasmasol in to plasmagel and vice versa is A
Bio-chemical phenomenon
B
Physio-chemical phenomenon
C
Chemical phenonmenon
D
Physical phenomenon
Answer :
Bio-chemical phenomenon
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452.
Number of major DNA molecules in bacteria are A
One
B
Two
C
Three
D
Many
Answer :
One
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453.
Which cytochrome most used in taxonomy A
Cytochrome - a
B
Cytochrome - b
C
Cytochrome - c
D
Cytochrome - d
Answer :
Cytochrome - c
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454.
Which one belongs to monera? A
Amoeba
B
Escherichia
C
Gelidium
D
Spirogyra
Answer :
Escherichia
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Whittaker (1969) divided organisms into five kingdoms : Monera, Protista, Plantae, Fungi and Animalia. Kingdom Monera includes all prokaryotes – Mycoplasma, bacteria, actinomycetes, blue-green algae, archaebacteria, methanogens. Escherichia is bacteria, Amoeba, Gelidium come under Protista, Spirogyra is algae.
455.
During binary fission entry of water in Amoeba is slowed down by A
Contractile vacuole
B
Hyaline caps
C
Water vacuoles
D
Food vacuoles
Answer :
Hyaline caps
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456.
Bacteria can not survive a highly salted pickle because A
They become plasmolysed & killed
B
Salt inhibit respiration
C
Pickle do not contain nutrients necessary for bacteria
D
Bacteria do not get light for photo synthesis
Answer :
They become plasmolysed & killed
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457.
One of the major components of cell wall of most fungi is A
Chitin
B
Peptidoglycan
C
Cellulose
D
Hemicellulose
Answer :
Chitin
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A cell wall is a rigid structural layer, which provides protection and structural support to the cells. The composition of cell wall varies from one species to another. In fungi, the cell wall is composed of strong covalent linkages of chitin, glucans and glycoproteins. Alternatively, in case of land plants, the cell wall is composed of cellulose and hemicellulose. Archean cell walls consists of peptidoglycans.
458.
Viruses have: A
DNA enclosed in a protein coat
B
Prokaryotic nucleus
C
Single chromosome
D
Both DNA and RNA
Answer :
DNA enclosed in a protein coat
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459.
Infective unit of virus is called A
Nucleoid
B
Virion
C
Nucleo protein
D
Capsid
Answer :
Virion
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460.
There exiss a close association between the algae and the fungus within a lichen. The fungus A
Fixes the atmospheric nitrogen for the alga
B
Release oxygen for the alga
C
Provides protection, anchorange and absorption for the alga
D
Provides food for the alga
Answer :
Provides protection, anchorange and absorption for the alga
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