please make sure you\'re 100% correct. i cant afford to get the wrong answer aga
ID: 280737 • Letter: P
Question
please make sure you're 100% correct. i cant afford to get the wrong answer again.. thank you
Saliva in the oral cavity contains the antibacterial substances lysozyme, an enzyme that cleaves elycosidic linkages in peptidoglycan of the bacterial cell wall, weakening the wall and causing cell ysis Section 2 41 and lactoperovidase wihich kals bacteria by a reaction that generates singlet oxs/gen la toxic form of oxsygen, Section 5 14, Yet, microbes are able to survive and inhabit the oral cavity. How is this possible? 1.3Explanation / Answer
Although the Lysozyme: cleaves glycosidic linkages of peptidoglycan and Lactoperoxidase: generates ROS (singlet oxygen). However, the high concentrations of nutrients near surfaces in the mouth promote localized microbial growth. the food you eat gives the microbes nutrients, the tooth consists of a mineral matrix (enamel) surrounding living tissue (dentin and pulp), entire new microbiome on the tooth.
It has found that the agonist as well as antagonist interactions between the microbes help to survive and inhabit the microorganism. For example, interaction between Streptococcus gordonii and Actinomyces naeslundii are both agonist and antagonist in nature. Both these microbes are involved in biofilm production. The A. naeslundii allowed S. gordonii to grow in the absence of arginine and removes hydrogen peroxide from co-aggregate cultures resulting decrease in protein oxidation in S. gordonii . Conversely, hydrogen peroxide produced by S. gordonii inhibits growth of A. naeslundii . Another example of antagonist relationship is of Streptococcus mutans , which is a leading cause of dental caries. It uses quorum sensing and releases bacteriocin when introduced to other bacteria while Streptococcus , Actinomyces , and Lactobacillus generate an acidic pH, which results in inhibition of growth of a variety of bacterial species.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.