Human Biology: Concepts and Current Issues (8th Edition)
8th Edition
ISBN: 9780134042435
Author: Michael D. Johnson
Publisher: PEARSON
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Textbook Question
Chapter 23, Problem 4TY
The large intestine of humans is populated by a complex community of benign microorganisms (not harmful) which compete for nutrients and may prevent pathogenic (harmful) microorganisms from becoming established. Which term would best describe this?
a. competitive exclusion
b. selective pressure
c. succession
d. environmental resistance
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The large intestine of humans is populated by a complex community of benign microorganisms (not harmful) which compete for nutrients and may prevent pathogenic (harmful) microorganisms from becoming established. Which term would best describe this?a. competitive exclusionb. selective pressurec. successiond. environmental resistance
Which of the following statements BEST describes a realized niche?
A. It is the expected morphology and physiology of microbes in a habitat.
B. It is the expected location and ecological function.
C. It is the observe location and ecological function.
D. It is the observe association of microbes in a habitat.
Which of the following statements DOES NOT describe microbes in an aquatic system?
A. Bacterial and archaeal species are equally represented in freshwater and marine.
B. Contains a large number of viruses.
C. Converts dissolved organic carbon to utilizable forms of higher trophic level organisms.
D. Possess several anti-predation mechanisms.
Chapter 23 Solutions
Human Biology: Concepts and Current Issues (8th Edition)
Ch. 23 - Do you think extending nations' ocean territorial...Ch. 23 - Are there any marine protected areas (MPAs) or...Ch. 23 - What are the components of an ecosystem?Ch. 23 - Prob. 2CRCh. 23 - Describe what happens to a country as it undergoes...Ch. 23 - Define zero population growth and explain why it...Ch. 23 - Prob. 5CRCh. 23 - Prob. 6CRCh. 23 - Prob. 7CRCh. 23 - Explain why the water cycle is essential to all...
Ch. 23 - Discuss the importance of the carbon cycle.Ch. 23 - Discuss the phosphorus cycle and its importance.Ch. 23 -
1. Your college campus, including all the humans...Ch. 23 -
2. Which of the following will affect the biotic...Ch. 23 - A population is growing at a rate of 2% per year....Ch. 23 - The large intestine of humans is populated by a...Ch. 23 -
5. Which of the following characterizes mature...Ch. 23 -
6. _____ flow(s) one-way through ecosystems while...Ch. 23 - All of the following terms can appropriately...Ch. 23 -
8. A human maintaining a vegan diet (containing...Ch. 23 - All of the following processes are involved in the...Ch. 23 - Prob. 10TYCh. 23 - Prob. 11TYCh. 23 -
12. Which biogeochemical cycle does not include...Ch. 23 - Prob. 13TYCh. 23 - Which of the following statements is false? a. The...Ch. 23 - Which statement about the human fertility rate is...Ch. 23 - Given absolutely no environmental resistance, how...Ch. 23 - Prob. 2AWKCh. 23 - Prob. 3AWKCh. 23 - Prob. 4AWKCh. 23 - Prob. 5AWKCh. 23 - Prob. 6AWKCh. 23 - Least developed countries tend to be poorer than...
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- Some invasive species carry pathogens or parasites with them. Scientists think this might be one reason why some introduced species become invasive. Carrying pathogens or parasites might make an invading species more successful if the invading pathogen or parasite ___________ a. Selectively infects and kills native competitors b. Dies out shortly after entering the new environment c. Loses its ability to infect all species in the new environment d. Selectively infects and kills the invasive speciesarrow_forwardA symbiotic relationship where both of the coexisting species benefit from the interaction is called ________. a. commensalism b. parasitism c. mutualism d. communismarrow_forwardWhich of the following is not true about microbial communities? A. They help herbivorous mammals to derive nutrition from otherwise indigestible cellulose. B. They consume some of the digesting food for their own nutrition. C. They help with vitamin production in the human digestive tract. D. They are present only in herbivores. E. None of the above answer choices are correct. (That is, answer choices A, B, C and D are all true statements.)arrow_forward
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