What are molecules such as viruses and bacteria that are foreign to the host and stimulate the immune system to react?

What will be an ideal response?


antigens

Biology & Microbiology

You might also like to view...

Determining the exact nucleotide sequence of a gene or gene fragment obtained from an unknown organism is based on which of the following methods?

a. Hybridization b. Sequencing c. Amplification (PCR) d. Genotypic

Biology & Microbiology

Demonstrating the occurrence of interspecific competition during a field study is problematic for all of the following reasons, except

A) it is difficult to know whether a population is at carrying capacity. B) competition is impossible to measure in a natural setting. C) scientists cannot control the environment. D) scientists lack full knowledge of the life history requirements of natural populations.

Biology & Microbiology

A virulence factor is one which

A) allows a microbe to invade and establish itself on the host. B) allows a host to evade infection. C) normal flora use against invading microorganisms. D) invading organisms use against normal flora.

Biology & Microbiology

If a doctor attempts to trigger the patellar tendon reflex and a lack of response occurs, what are potential regions where pathology might exist? I) the brain II) the knee III) the spinal cord

A) only I B) only II C) only III D) only II and III

Biology & Microbiology