At about what pH do health-associated streptococci stop metabolizing?

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards
From $24.99Unlock all

Prepare for the Microbiology and Immunology 6400 Oral Intermicrobial Interactions Test. Study with engaging materials, flashcards, and multiple-choice questions. Each question offers hints and detailed explanations. Ace your exam today!

Multiple Choice

At about what pH do health-associated streptococci stop metabolizing?

Explanation:
Environmental pH strongly regulates bacterial metabolism in dental plaque. Health-associated streptococci are relatively sensitive to acid, so as the environment becomes more acidic, their metabolic activity decreases and they eventually stop metabolizing. This threshold occurs around pH six, where enzyme function and cellular processes become too inhibited for continued sugar fermentation. In the mouth, after sugar intake, plaque pH can dip below this point; these streptococci then pause their metabolism, while more acid-tolerant species can continue to function and drive further acidification if the pH remains low.

Environmental pH strongly regulates bacterial metabolism in dental plaque. Health-associated streptococci are relatively sensitive to acid, so as the environment becomes more acidic, their metabolic activity decreases and they eventually stop metabolizing. This threshold occurs around pH six, where enzyme function and cellular processes become too inhibited for continued sugar fermentation. In the mouth, after sugar intake, plaque pH can dip below this point; these streptococci then pause their metabolism, while more acid-tolerant species can continue to function and drive further acidification if the pH remains low.

More Multiple Choice Questions
Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy