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Prokaryotes and viruses

Written by Dr. Hira Salman (Biology)

Class 11 · Biology · 8 questions

Name: ____________________   Date: ____________

  1. Bacteria reproduce mainly by:

    • A Meiosis
    • B Mitosis
    • C Binary fission
    • D Spore formation only

  2. A virus consists of a protein coat and:

    • A Genetic material
    • B A cell wall
    • C A nucleus
    • D Mitochondria

  3. A virus that infects bacteria is a:

    • A Bacteriophage
    • B Retrovirus only
    • C Fungus
    • D Prion

  4. Gram positive bacteria stain:

    • A Green
    • B Purple
    • C Pink or red
    • D Not at all

  5. Cyanobacteria carry out:

    • A Nothing
    • B Only fermentation
    • C Only respiration
    • D Photosynthesis

  6. Which structure do viruses lack?

    • A Genetic material
    • B Cell membrane
    • C Protein coat
    • D Nucleic acid

  7. Penicillin kills bacteria by affecting their:

    • A Mitochondria
    • B Ribosomes only
    • C Nucleus
    • D Cell wall

  8. Spherical bacteria are called:

    • A Vibrios
    • B Bacilli
    • C Spirilla
    • D Cocci

Answer key

1. C, 2. A, 3. A, 4. B, 5. D, 6. B, 7. D, 8. D

  1. A bacterial cell divides into two.

  2. Viruses have DNA or RNA inside a protein coat.

  3. A bacteriophage infects bacteria.

  4. They have a thick cell wall that retains the crystal violet stain.

  5. They are photosynthetic prokaryotes.

  6. Viruses are not cells.

  7. It stops cell wall formation.

  8. Cocci are round.