Question

the major significance of robert kochs work is that

diseases can be transmitted from one animal to another

microorganisms are present in a diseased animal

microorganisms cause disease

microorganisms are the result of disease

microorganisms can be cultured

question 4 (1 point)

which of the following is not a communicable disease?

typhoid fever

tetanus

tuberculosis

aids

malaria

Explanation:

• For the first question:
• Robert Koch's work was crucial in establishing the germ - theory of disease. He developed Koch's postulates which proved that microorganisms cause specific diseases.
• The idea that diseases can be transmitted from one animal to another was known before Koch. The presence of microorganisms in a diseased animal does not prove causation (they could be secondary invaders). The statement that microorganisms are the result of disease is incorrect as per the germ - theory. And while culturing microorganisms is an important technique, the major significance is proving causation.
• For the second question:
• A communicable disease is one that can be transmitted from one person (or animal) to another.
• Typhoid fever is transmitted through contaminated food and water. Tuberculosis is transmitted through the air. AIDS is transmitted through body fluids. Malaria is transmitted through mosquito bites.
• Tetanus is caused by the bacterium Clostridium tetani. It usually enters the body through a wound (like a cut or a puncture). It is not transmitted from person to person.

Answer:

• First question: microorganisms cause disease
• Second question: tetanus