How does the body respond when it first encounters a foreign particle or bacterial pathogen?
What will be an ideal response?
Answer: The body has defensive cells called phagocytes (neutrophils and macrophages are examples) that recognize foreign particles and bacterial pathogens. Initial interactions with pathogens or foreign particles recruit large numbers of phagocytes to the site of infection. Here the phagocytes activate defense genes, leading to the transcription and translation of proteins that destroy the pathogen or foreign particle. Macrophages also present the antigens to T helper cells, which starts the process of activating the adaptive immune system.
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Mollicutes, in the phylum Tenericutes, includes all bacteria that lack walls and do not synthesize peptidoglycan precursors.
Answer the following statement true (T) or false (F)
Energy can be redistributed within a collection of matter (called a system) or can be redistributed between the system and its surroundings.
Answer the following statement true (T) or false (F)
How does an intrauterine device (IUD) prevent pregnancy?
A. killing sperm as they enter the fallopian tubes. B. preventing sperm from entering the vagina. C. creating a uterine environment toxic to sperm and eggs. D. disabling the cilia that facilitate the passage of the eggs.
Match the following prefixes with their relationship to the standard base unit (g, m, L):
Micro A) 1/100 B) 1/1,000,000 C) 1000 D) 1/1000