Biology MCQs

Page No. 64

Rapid growth at exponential ration occurs in which phase of bacterial growth:


aLag phase


bLog phase


cStationary phase


dDeath / decline phase


View Answer Log phase

Chemical substances used on living tissues that inhibit the growth of micro organism are called___________?


aAntiseptics


bDisinfectants


cAntibiotics


dVaccines


View Answer Antiseptics

Who developed the vaccine against anthrax?


aLouis Pasteur


bEdward Jenna


cLeuvenhoek


dAlexander Fleming


View Answer Louis Pasteur

Cyanobacteria have ________ cell wall?


aGram +ve.


bGram – ve.


cAcid fast


dCellulose rich


View Answer Gram – ve.

Which of the following help cyanobacteria to locomote?


aFlagella


bGas vesicles


cBoth of these


dNone of these


View Answer Gas vesicles

Cyanobacteria reproduce by____________?


aBinary fission


bMitosis


cMeiosis


dConjugation


View Answer Binary fission

Approximately _____ species of bacteria are known to cause diseases in humans.


a100


b200


c300


d400


View Answer 200

A group of 8 cocci is called______________?


aDiplococci


bOctococci


cTetrad


dSarcina


View Answer Sarcina

Which of the following bacteria are thick rigid and spiral______________?


aVibrio


bSpirillum


cSpirochete


dCoccus


View Answer Spirillum

The first bacterium isolated was_________________?


aCoccus


bBacillus


cVibrio


dSpirochete


View Answer Bacillus

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