Robert Koch is famous for establishing 'Koch's postulates', which are a set of criteria used to: MCQ with Answer and Explanation

Robert Koch is famous for establishing 'Koch's postulates', which are a set of criteria used to:
A. Discover the structure of DNA
B. Classify bacteria based on Gram staining
C. Establish a causal relationship between a specific microbe and a specific disease
D. Develop vaccines against viral diseases
Answer: Option C
Solution (By JKSSB Mock Tests)
Robert Koch, a German physician and microbiologist, formulated Koch's postulates in the late 19th century. These four criteria are designed to establish a causal relationship between a specific microbe and a specific disease. The postulates require that the microbe must be found in all cases of the disease, isolated and grown in pure culture, cause the disease when inoculated into a healthy susceptible host, and be re-isolated from the experimentally infected host.

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Practice More Biology Questions

Question #1
Which of the following blood cells is responsible for humoral immunity?
A. Neutrophils
B. B lymphocytes
C. T lymphocytes
D. Macrophages

Correct Answer: Option B


Explanation:
B lymphocytes differentiate into plasma cells that produce antibodies (immunoglobulins) against specific antigens, providing humoral immunity. T cells mediate cellular immunity, macrophages and neutrophils are phagocytes.

This question belongs to: Science Biology
Question #2
Which part of the nephron is primarily involved in the reabsorption of glucose and amino acids?
A. Loop of Henle
B. Proximal convoluted tubule
C. Distal convoluted tubule
D. Collecting duct

Correct Answer: Option B


Explanation:
The proximal convoluted tubule (PCT) reabsorbs about 70-80% of electrolytes and water, and almost 100% of glucose, amino acids, and vitamins back into the blood via active transport and facilitated diffusion. The loop of Henle concentrates urine, the DCT reabsorbs sodium and water under hormonal control, and the collecting duct reabsorbs water (ADH-dependent). PCT cells have microvilli for increased surface area.

This question belongs to: Science Biology
Question #3
The scientist who proved that microorganisms cause disease was:
A. Joseph Lister
B. Robert Koch
C. Antonie van Leeuwenhoek
D. Louis Pasteur

Correct Answer: Option B


Explanation:
Robert Koch established Koch's postulates, demonstrating that specific microbes cause specific diseases (anthrax, tuberculosis, cholera).

This question belongs to: Science Biology