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question_answer1) Read the assertion and reason carefully to mark the correct option out of the options given below: Assertion : Bacteria are prokaryotic. Reason : Bacteria do not possess true nucleus and membrane bound cell organelles. [AIIMS 1996]
question_answer2) Assertion : Bacteria have three basic shapes, i.e., round, rod, spiral. Reason : Cocci and Bacilli may form clusters or chain of a definite length. [AIIMS 2000]
question_answer3) Assertion : Bacterial photosynthesis occurs by utilizing wavelength longer than 700 nm. Reason : Here reaction centre is B-890. [AIIMS 2002]
question_answer4) Assertion : The nitrogen-fixing bacteria in leguminous plant nodules live as symbionts. Reason : Leg-haemoglobin synthesized by leguminous plants protect bacteria.
question_answer5) Assertion : Bacteria are classified among plants. Reason : They have cell walls.
question_answer6) Assertion : Prokaryotic chromosome differs from a eukaryotic one by the absence of histone proteins. Reason : Bacterial cell is prokaryote.
question_answer7) Assertion : Some bacteria have the capacity to retain Gram stain after treatment with acid alcohol. Reason : They are known as Gram positive as they are attracted towards positive pole under influence of electric current.
question_answer8) Assertion : None autotrophic bacteria carry out chemosynthesis. Reason : Chemosynthetic bacteria trap the small amount of energy released from inorganic compound?s oxidation to use in the reactions that synthesize carbohydrates.
question_answer9) Assertion : Exotoxins are relased by Gram +ve bacteria causing diseases to animals. Reason : Exotoxins are proteins to whose response WBC of animals react.
question_answer10) Assertion : The bacteria cysts are produced to avoid unfavourable conditions. Reason : Bacillus anthracis and Clostridium survive for very long durations due to endospores.
question_answer11) Assertion : Broad spectrum antibiotics are produced by streptomyces. Reason : They can destroy microorganisms by inhibiting DNA replication or protein synthesis.
question_answer12) Assertion : Bacterial cell wall is characterised by having mucopolysaccharides. Reason : Acetyl muramic acid is an example of mucopolysaccharide.
question_answer13) Assertion : Root nodules in leguminous plants are inhabited by Anabaena. Reason : Leguminous plants are an example of symbiotic nitrogen fixation.
question_answer14) Assertion : Bacillus butschli is true bacterium. Reason : Its cell wall is composed of acetyl muramic acid.
question_answer15) Assertion : Plasmids are single-stranded extra chromosomal DNA. Reason : Plasmids are possessed by eukaryotic cells.
question_answer16) Assertion : E. coli is the most studied prokaryotes. Reason : E. coli is Gram +ve bacteria.
question_answer17) Assertion : Pili are motile appendages of bacteria. Reason : Pili participate in conjugation.
question_answer18) Assertion : Bacterial cell wall are not like the plant cell. Reason : Bacterial cell wall is made up of cellulose.
question_answer19) Assertion : Cell secretion does not occur in bacteria. Reason : Golgi complex is absent in bacteria.
question_answer20) Assertion : All food chains will come to stand still if bacteria disappear from earth. Reason : Bacteria are only associated with the soil fertility and hardly any role for food chains.
question_answer21) Assertion : Bacteria do not always move with the help of flagella. Reason : Flagellated bacteria employs rotary motion of flagellum when it moves.
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