Do You Have Basic Knowledge About 9th Grade Biology?

10 Questions | Total Attempts: 152

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Do You Have Basic Knowledge About 9th Grade Biology?

Microorganisms are microscopic, living, single-celled organisms such as bacteria. Sometimes people refer to viruses as microorganisms, which they are not. Viruses are not alive, they are simply a strand of DNA in a protein coating. Let's learn about Microorganisms and Diseases.


Questions and Answers
  • 1. 
    In many hospital wards it is necessary for you to wash your hands with a special gel before going in or out. Before the middle of the 19th Century, not even doctors washed their hands. Why not?
    • A. 

      They didn't know about microorganisms and how they can cause disease

    • B. 

      They were too lazy

    • C. 

      Hand cleaning gels for hospitals had not been invented

    • D. 

      Hospitals could not afford to buy soap for them to use

  • 2. 
    Why are bacteria cultures in a school or college laboratory grown at much lower temperatures (25oC compared to 37oC) than in a professional microbiology lab?
    • A. 

      It is less dangerous as the bacteria grow more slowly

    • B. 

      It is cheaper

    • C. 

      School agar gel melts at temperatures above 25oC

    • D. 

      Schools and colleges can't leave the heaters on all day and all night

  • 3. 
    A group of Y11 students carried out an investigation into antibiotics which required them to grow some bacteria cultures. Which one of the following is not something they would have done whilst setting up the cultures?
    • A. 

      Sterilise the Petri dishes and use sterilised agar gel

    • B. 

      Sterilise the wire loops used for sampling in a flame

    • C. 

      Seal the Petri dishes with sellotape

    • D. 

      Pick up the antibiotic discs using their hands

  • 4. 
    Which of the following is an example of passive immunity?
    • A. 

      Mucus and cilia in the respiratory system

    • B. 

      Hydrochloric acid in the stomach

    • C. 

      Lysozyme (an enzyme) in tears

    • D. 

      All three of the above

  • 5. 
    Vaccination is used to immunise people against diseases. Pick the false statement:
    • A. 

      When a vaccine is injected into the body, it stimulates the white blood cells to produce antibodies against the pathogen

    • B. 

      There are no possible side-effects from any vaccination

    • C. 

      Vaccines can contain the live pathogen that has been specially treated to make it harmless

    • D. 

      Harmless fragments of the pathogen and toxins produced by pathogens can both be used as vaccines

  • 6. 
    When you catch a bad cold at the start of winter, quite often, the next few colds are not as bad. Which of the following options could be a reason for this?
    • A. 

      It is only at the start of winter that the bad cold viruses are around

    • B. 

      The drugs that you took to fight off the cold stay in your system and protect you

    • C. 

      More cold weather weakens the virus that causes colds

    • D. 

      Your immune system develops antibodies that protect you

  • 7. 
    Why are antibiotics no good for treating colds and 'flu?
    • A. 

      Colds and 'flu are viruses

    • B. 

      Colds and 'flu are not viruses

    • C. 

      Colds and 'flu are caused by bacteria that are resistant to antibiotics

    • D. 

      Antibiotics work too slowly

  • 8. 
    Robert Koch discovered how to grow bacteria in a laboratory. How did this help medical science?
    • A. 

      It prevented laboratory technicians from catching infectious diseases

    • B. 

      It enabled him to identify some pathogenic microorganisms and linked them to specific diseases

    • C. 

      It allowed doctors to make their own vaccines for their patients

    • D. 

      It meant that hospitals could now save money on drugs

  • 9. 
    How do bacteria and viruses make you feel ill?
    • A. 

      They both damage the cells in your body

    • B. 

      Bacteria irritate the cells of your body and viruses produce toxins

    • C. 

      They take over the cells in your body

    • D. 

      The waste materials from bacteria are toxic to the body and viruses damage your cells

  • 10. 
    Which of the following can be used to help protect your body from microorganisms?
    • A. 

      Vaccination and antibiotics

    • B. 

      Antibiotics only

    • C. 

      Vaccination only

    • D. 

      Nothing