Q. Which of the following statements is wrong for viroids? They lack a protein coat They are smaller than viruses They cause infections Their RNA is of high molecular weight Answer: Their RNA is of high molecular weight
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Q. One of the major components of the cell wall of most fungi is Chitin Peptidoglycan Cellulose Hemicellulose Answer: Chitin
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Q. In which group of organisms the cell walls form two thin overlapping shells which fit together? Euglenoids Dinoflagellates Slime moulds Chrysophytes Answer: Chrysophytes
Q. The structures that help some bacteria to attach to rocks and /or host tissues are: Fimbriae Mesosomes Holdfast Rhizoids Answer: Fimbriae
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Q. The motile bacteria can move by: Fimbriae Flagella Cilia Pili Answer: Flagella
Q. Which of the following structures is not found in a prokaryotic cell? Ribosome Mesosome Plasma membrane Nuclear envelope Answer: Nuclear envelope
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Q. Which of the following shows coiled RNA strand and capsomeres? Poliovirus Tobacco mosaic virus Measles virus Retrovirus Answer: Tobacco mosaic virus
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Q. Archaebacteria differ from eubacteria in: Cell membrane Mode of nutrition Cell shape Mode of reproduction Answer: Cell shape
Q. Which of the following are likely to be present in deep seawater? Eubacteria Blue-green algae Saprophytic fungi Archaebacteria Answer: Archaebacteria
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Q. Satellite RNAs are present in some Plant viruses Viroids Prions Bacteriophages Answer: Plant viruses
