631. The method of food intake in Amoeba is called

A Saprophytic
B Holozoic
C Holophytic
D Parasitic
Answer :   Holozoic
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632. They zygospore in spirogyra is

A One layered
B Two-layered
C Three-layered
D Multi-layered
Answer :   Three-layered
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633. Which one of the following statements about viruses is correct?

A Viruses possess their own metabolic system
B Viruses contain either DNA or RNA
C Viruses are facultative parasites
D Viruses are readily killed by antibiotics
Answer :   Viruses contain either DNA or RNA
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634. Under optimal conditions of temperature and nutrition, most of the bacteria divide at an interval of

A 24 Hrs
B 20 minutes
C 60 minutes
D 5 minutes
Answer :   20 minutes
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635. In which form would you find chromatoid bodies in Entamoeba histolytica

A In Minuta
B In mature cyst
C In trophoite
D In young cyst
Answer :   In Minuta
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636. Which of the following has only one host

A P. Vivax
B Trypanosoma gambiense
C Taenia solium
D Entamoeba histolytica
Answer :   Entamoeba histolytica
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637. Protistan genome has

A membrane bound nucleoproteins embedded in cytoplasm
B free nucleic acid aggregates
C gene containing nucleoproteins condensed together in loose mass
D nucleoprotein in direct contact with cell substance
Answer :   membrane bound nucleoproteins embedded in cytoplasm
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638. What is true for plasmid

A Plasmids are widely used in gene transfer
B These are found in virus
C Plasmid contain gene for vital activities
D These are main part of chromosome
Answer :   Plasmids are widely used in gene transfer
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639. Which bacterium develops flavour and aroma in tea and tabacoo leaves

A Streptococus lactis
B Zotobacter
C Bacillus megatherium
D Radicicola
Answer :   Bacillus megatherium
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640. The bacterial genophore is attached to

A Vessicle
B Tubule
C Mesosome
D Thylakoid
Answer :   Mesosome
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