The dose of an antigen that kills 50% of animals in a test group and is used to estimate the virulence of a pathogen is known as

A) Antigen dose50.
B) Virulence-50.
C) LD50 (lethal dose50).
D) Death rate-50.


Answer: C

Biology & Microbiology

You might also like to view...

Which of the following measures is used to determine a substance's polarity?

A) partition coefficient B) extinction coefficient C) polarity factor D) asymmetrical distribution points E) polarity determining factor

Biology & Microbiology

Answer the following statements true (T) or false (F)

1. If sucrose is composed of both glucose and fructose, then sucrose must be a monosaccharide. 2. Lipids and carbohydrates can both be used by animals to store energy. 3. Saturated fats are composed of fatty acids with several double bonded carbons. 4. A polyunsaturated fat contains fatty acids with multiple double bonded carbons.

Biology & Microbiology

Which type of plant would be the most nutritionally valuable to a human?

A) a plant that has no ground tissue B) a plant with 10% ground tissue and 90% vascular tissue C) a plant with minimal reproductive organs D) a plant with 90% ground tissue and 10% vascular tissue

Biology & Microbiology

Why is the scientific method used?

What will be an ideal response?

Biology & Microbiology