Biology: Life on Earth with Physiology (11th Edition)
11th Edition
ISBN: 9780133923001
Author: Gerald Audesirk, Teresa Audesirk, Bruce E. Byers
Publisher: PEARSON
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Chapter 20, Problem 2AC
Before the discovery of prions, many (perhaps most) biologists would have agreed with the statement “It is a fact that no infections organism or particle can exist that lacks
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Choose the false statement: (Regarding Pasteur’s famous experiment) The swan necked flasks were important because they allowed the broth to remain sterile, while still remaining open to the atmosphere. Pasteur’s work with the swan neck flasks was only of importance to the food industry; his work occurred long before anyone, including Pasteur, had any awareness that diseases could be caused by microscopic agents. The swan necked flasks were used to prove that life could only arise from pre-existing cells.
It was not until 1928 that penicillin, the first true antibiotic, was discovered by Alexander Fleming,
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2. As eukaryotic cells become more specialized, the nucleus is NOT important as the site of a) DNA synthesis, b) changes in the regulation of genes, c) protein synthesis, d) the transcription of mRNA for protein synthesis, e) DNA mutation.
3. In the evolution of the eukaryotic cell, these cells have key changes that include which of the following: a) These cells reproduce by copying their DNA perfectly each generation. b) They have their DNA in the nucleoid area. c) have adapted the mesosome membrane system of the prokaryote to form a nucleus and an endoplasmic reticulum. d) each new type on new eukaryote cell has its own mesosomes e) none of these are true.
4. The evolution/development of the skeletal system found in the Deuterostomes, is made up of two molecules, Ca+2PO4-2 and collagen These molecules are produced released from by a specialized type of stem cell. Therefore, one would expect that these stem cells perform which…
Chapter 20 Solutions
Biology: Life on Earth with Physiology (11th Edition)
Ch. 20.1 - describe some differences between bacteria and...Ch. 20.1 - describe the typical sizes and shapes of...Ch. 20.2 - Unwelcome Dinner Guests A few of the bacteria that...Ch. 20.2 - describe the range of environments inhabited by...Ch. 20.2 - As part of a study on the relationship between...Ch. 20.2 - Unpleasant breath odors are caused mainly by...Ch. 20.2 - What might explain the observation that most...Ch. 20.2 - describe adaptations that help protect prokaryotes...Ch. 20.2 - Some of the enzymes that have important uses in...Ch. 20.2 - explain how prokaryotes reproduce and exchange...
Ch. 20.2 - What is the main advantage of prokaryotic fission,...Ch. 20.3 - Unwelcome Dinner Guests Many of the bacteria...Ch. 20.3 - explain how prokaryotes affect animal and plant...Ch. 20.3 - If all of Earths nitrogen-fixing prokaryotes were...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 - Unwelcome Dinner Guests How do harmful bacteria...Ch. 20.4 - describe the structure and characteristics of...Ch. 20.4 - Why are viruses unable to replicate outside of a...Ch. 20.4 - describe the effects they can have on host...Ch. 20.4 - Biotechnologists often use viruses to transfer...Ch. 20 - Prob. 1ACCh. 20 - ____________, have peptidoglycan in...Ch. 20 - The name of the process by which DNA is...Ch. 20 - Describe some of the ways in which prokaryotes...Ch. 20 - Before the discovery of prions, many (perhaps...Ch. 20 - Prokaryotic cells are ____________,...Ch. 20 - A community of prokaryotes surrounded by slime and...Ch. 20 - What are nitrogen-fixing bacteria, and what role...Ch. 20 - Many prokaryotes use ____________ to move about....Ch. 20 - Which of the following statements about archaea is...Ch. 20 - Describe some of the extreme environments in which...Ch. 20 - ____________,bacteria inhabit environments that...Ch. 20 - Viruses a. are usually photosynthetic. b. consist...Ch. 20 - What is an endospore? What is its function?Ch. 20 - Prokaryotes reproduce by ____________ and may...Ch. 20 - Applying fertilizer near an oil spill to Increase...Ch. 20 - What is conjugation? What role do plasmids play in...Ch. 20 - The plant nutrient ammonium is produced by...Ch. 20 - Why are prokaryotes especially useful in...Ch. 20 - Cholera, gonorrhea, and pneumonia are some of the...Ch. 20 - Describe the structure of a typical virus. How do...Ch. 20 - A virus consists of a molecule of __________ or...Ch. 20 - Describe some examples of how prokaryotes are...Ch. 20 - How do archaea and bacteria differ? How do...
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