Biology
12th Edition
ISBN: 9780134813448
Author: Audesirk, Teresa, Gerald, Byers, Bruce E.
Publisher: Pearson,
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Chapter 20.2, Problem 1HYEW
Unpleasant breath odors are caused mainly by prokaryotes that live in the mouth. The warm, moist human mouth cavity hosts a diverse microbial community that includes more than 2,000 prokaryote species. Many of these species acquire energy and nutrients by breaking down mucus, food particles, and dead cells.
The by-products of this breakdown can include foul-smelling gases, some of which are also emitted by feces or decaying bodies.
The highest concentration of bad-breath prokaryotes is found at the base of the tongue. This location may be especially hospitable to microbes owing to the accumulation of mucus that drains down into the back of the throat from the nose. So, if you gargle with antiseptic mouthwash to control bad breath, thrust your tongue forward so the mouthwash can reach the base of your tongue.
What Causes Bad Breath?
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The metabolic pathway below is used for the production of the purine nucleotides adenosine monophosphate (AMP) and guanosine monophosphate (GMP) in eukaryotic cells. Assume each arrow represents a reaction catalyzed by a different enzyme. Using the principles of feedback inhibition, propose a regulatory scheme for this pathway that ensures an adequate supply of both AMP and GMP, and prevents the buildup of Intermediates A through G when supplies of both AMP and GMP are adequate.
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examples of synamptomorphy
Chapter 20 Solutions
Biology
Ch. 20.1 - describe some differences between bacteria and...Ch. 20.1 - describe the typical sizes and shapes of...Ch. 20.2 - What might explain the observation that most...Ch. 20.2 - Unwelcome Dinner Guests A few of the bacteria that...Ch. 20.2 - Some of the enzymes that have important uses in...Ch. 20.2 - Unpleasant breath odors are caused mainly by...Ch. 20.2 - As part of a study on the relationship between...Ch. 20.2 - What is the main advantage of prokaryotic fission,...Ch. 20.2 - describe the range of environments inhabited by...Ch. 20.2 - describe adaptations that help protect prokaryotes...
Ch. 20.2 - explain how prokaryotes reproduce and exchange...Ch. 20.3 - If all of Earths nitrogen-fixing prokaryotes were...Ch. 20.3 - Unwelcome Dinner Guests Many of the bacteria...Ch. 20.3 - explain how prokaryotes affect animal and plant...Ch. 20.3 - explain prokaryotes role in nutrient recycling?Ch. 20.3 - describe how prokaryotes help clean up pollution?Ch. 20.3 - describe some of the pathogenic bacteria that...Ch. 20.4 - Why are viruses unable to replicate outside of a...Ch. 20.4 - Biotechnologists often use viruses to transfer...Ch. 20.4 - describe the structure and characteristics of...Ch. 20.4 - describe the effects they can have on host...Ch. 20.4 - Prob. 3CYLCh. 20.4 - Unwelcome Dinner Guests How do harmful bacteria...Ch. 20 - The name of the process by which DNA is...Ch. 20 - A community of prokaryotes surrounded by slime and...Ch. 20 - Which of the following statements about archaea is...Ch. 20 - Viruses a. are usually photosynthetic. b. consist...Ch. 20 - Applying fertilizer near an oil spill to Increase...Ch. 20 - ____________, have peptidoglycan in...Ch. 20 - Prokaryotic cells are ____________,...Ch. 20 - Many prokaryotes use ____________ to move about....Ch. 20 - ____________,bacteria inhabit environments that...Ch. 20 - Prokaryotes reproduce by ____________ and may...Ch. 20 - The plant nutrient ammonium is produced by...Ch. 20 - Cholera, gonorrhea, and pneumonia are some of the...Ch. 20 - A virus consists of a molecule of __________ or...Ch. 20 - Describe some of the ways in which prokaryotes...Ch. 20 - What are nitrogen-fixing bacteria, and what role...Ch. 20 - Describe some of the extreme environments in which...Ch. 20 - What is an endospore? What is its function?Ch. 20 - What is conjugation? What role do plasmids play in...Ch. 20 - Why are prokaryotes especially useful in...Ch. 20 - Describe the structure of a typical virus. How do...Ch. 20 - Describe some examples of how prokaryotes are...Ch. 20 - How do archaea and bacteria differ? How do...Ch. 20 - Prob. 1ACCh. 20 - Before the discovery of prions, many (perhaps...
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