Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Textbook Question
Chapter 22, Problem 31CTQ
Why do scientists believe that the first organisms on Earth were extremophiles?
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Which of the following extremophiles is the best model for the earliest organisms on Earth?
A. a prokaryote found near hydrothermal vents
B. an archaean capable of surviving in the polar ice caps
C. an anaerobic archaean species
D. a bacterium that thrives in a highly acidic environment
Chapter 22 Solutions
Biology 2e
Ch. 22 - Figure 22.8 Compared to free-floating bacteria,...Ch. 22 - Figure 22.16 Which of the following statements is...Ch. 22 - Figure 22.19 Which of the following statements...Ch. 22 - The first forms of life on Earth were thought to...Ch. 22 - Microbial mats. are the earliest forms of life on...Ch. 22 - The first organisms that oxygenated the atmosphere...Ch. 22 - Halophiles are organisms that require a salt...Ch. 22 - Many of the first prokaryotes to be cultured in a...Ch. 22 - The presence of a membrane-enclosed nucleus is a...Ch. 22 - Which of the following consist of prokaryotic...
Ch. 22 - The cell wall is ___________ . interior to the...Ch. 22 - Organisms most likely to be found in extreme...Ch. 22 - Prokaryotes stain as Gram-positive or Gramnegative...Ch. 22 - Pseudopeptidoglycan is a characteristic of the...Ch. 22 - The lipopolysaccharide layer (LPS) is a...Ch. 22 - Which of the following elements is not a...Ch. 22 - Prokaryotes that obtain their energy from chemical...Ch. 22 - Ammonification is the process by which. ammonia is...Ch. 22 - Plants use carbon dioxide from the air and are...Ch. 22 - Cyanobacteria harness energy from the sun through...Ch. 22 - A disease that is constantly present in a...Ch. 22 - Which of the statements about biofilms is...Ch. 22 - Which of these statements is true? An antibiotic...Ch. 22 - A person in England arrives at a medical clinic...Ch. 22 - MRSA has emerged as a serious infectious disease,...Ch. 22 - Which of these occurs through symbiotic nitrogen...Ch. 22 - Synthetic compounds found in an organism but not...Ch. 22 - Bioremediation includes. the use of prokaryotes...Ch. 22 - In addition to providing yogurt with its unique...Ch. 22 - Describe briefly how you would detect the presence...Ch. 22 - Why do scientists believe that the first organisms...Ch. 22 - A new bacterial species is discovered and...Ch. 22 - Mention three differences between bacteria and...Ch. 22 - Explain the statement that both types, bacteria...Ch. 22 - A scientist isolates a new species of prokaryote...Ch. 22 - Think about the conditions (temperature, light,...Ch. 22 - Farmers continually rotate the crops grown in...Ch. 22 - Imagine a region of soil became contaminated,...Ch. 22 - Explain the reason why the imprudent and excessive...Ch. 22 - Researchers have discovered that washing spinach...Ch. 22 - Your friend believes that prokaryotes are always...Ch. 22 - Many people use antimicrobial soap to kill...
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- When do bacteria form endospores? a-when they get ready to reproduce b-when environmental conditions become unfavorable c-when they get ready to carry out conjugation d-when they carry out photosynthesisarrow_forwardWhen do bacteria form endospores? a-When environmental conditions are unfavourable b-When they want to carry out photosynthesis c-When they want to reproduce through binary fission d-When they want to reproduce through conjugationarrow_forwardWhy was the development of enzymes fundamental to the evolution of life? a) without enzymes, the activation energy for essential reactions was too low b) enzymes allowed for high rate of catalysis at relatively low temperatures c) enzymes reduced the cellular demand for ATP d) enzymes allowed for reactions to occur spontaneouslyarrow_forward
- Why do you think there are limited scientists like microbiologists that focuses in studying organisms such as archaea?arrow_forwardHow did louis pasteur help disprove spontaneous generation?arrow_forwardHow did the experiments of Redi and Pasteur refute the hypothesis of spontaneous generation?arrow_forward
- Why was the evolution of photosynthesizing bacteria important for the evolution of large, oxygen-consuming organisms like ourselves?arrow_forwardHow did the experiments of Redi and Pasteur refute the spontaneous generation hypothesis?arrow_forwardWhat might happen if all of the autotrophs on the planet suddenly became heterotrophs? No organism would be able to collect energy from light or carbon from air, and life would end. Heterotrophs would get their energy from sunlight. New autotrophs would arise through exogenesis. Some heterotrophs would become mesotrophs.arrow_forward
- What are the reason why scientist cannot provide the exact number of bacteria existing on earth? give three reason.arrow_forwardThe first organisms that oxygenated the atmosphere were ______. a. cyanobacteria b. phootrophic organisms c. anaerobic organisms d. allof the abovearrow_forwardWhy do you think it is much more difficult to classify microbial species than plants or animals?arrow_forward
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