Q. Which of the following statements is wrong for viroids? They lack a protein coatThey are smaller than virusesThey cause infectionsTheir RNA is of high molecular weight Answer: Their RNA is of high molecular weight

Q. One of the major components of the cell wall of most fungi is ChitinPeptidoglycanCelluloseHemicellulose Answer: Chitin

Q. In which group of organisms the cell walls form two thin overlapping shells which fit together? EuglenoidsDinoflagellatesSlime mouldsChrysophytes Answer: Chrysophytes

Q. The structures that help some bacteria to attach to rocks and /or host tissues are: FimbriaeMesosomesHoldfastRhizoids Answer: Fimbriae

Q. The motile bacteria can move by: FimbriaeFlagellaCiliaPili Answer: Flagella

Q. Which of the following structures is not found in a prokaryotic cell? RibosomeMesosomePlasma membraneNuclear envelope Answer: Nuclear envelope

Q. Which of the following shows coiled RNA strand and capsomeres? PoliovirusTobacco mosaic virusMeasles virusRetrovirus Answer: Tobacco mosaic virus

Q. Archaebacteria differ from eubacteria in: Cell membraneMode of nutritionCell shapeMode of reproduction Answer: Cell shape

Q. Which of the following are likely to be present in deep seawater? EubacteriaBlue-green algaeSaprophytic fungiArchaebacteria Answer: Archaebacteria

Q. Satellite RNAs are present in some Plant virusesViroidsPrionsBacteriophages Answer: Plant viruses