WHAT IS LIFE? GDE.TO BIOLOGY W/PHYSIO.
5th Edition
ISBN: 9781319272531
Author: PHELAN
Publisher: MAC HIGHER
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Chapter 15, Problem 7MC
Summary Introduction
Introduction:
Archaea constitute a domain of single celled organisms. These microbes are prokaryotes which do not have a definite nucleus. They are often called as “extremophiles” because they can easily survive in extreme environment such as sea vents releasing sulfide rich gases, hot springs, or boiling mud around volcanoes.
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Which of the following is not part of Koch’s Postulates?
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Chapter 15 Solutions
WHAT IS LIFE? GDE.TO BIOLOGY W/PHYSIO.
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- How do Gram-negative bacteria differ from Gram-positivebacteria?a. They are not pathogenic.b. Their peptidoglycan cell wall is thinner.c. Gram-negative bacteria cannot be Gram stained.d. They possess a single plasma membrane.e. Gram-negative bacteria do not photosynthesize.arrow_forward5) The biological species concept cannot be applied to bacteria because a.they reproduce by binary fission b.they are single-celled c.they die d.they are all pathogensarrow_forwardan agent that is bacteriostatic: a. kills algae b. kills bacteria c. inhibits the growth of fungi d. inhibits the growth of bacteriaarrow_forward
- Which of the following statements correctly describes exotoxins and endotoxins produced by various bacteria? A. endotoxins are secreted into the environment while the bacteria are still alive B. exotoxins are secreted into the environment while the bacteria are still alive C. exotoxins are only released into the environment when the bacteria die and their cell walls break down D. exotoxins are components of the outer membrane of the bacteria that produce themarrow_forwardWhich of these statements is true? a. An antibiotic is any substance produced by a organism that is antagonistic to the growth of prokaryotes. b. An antibiotic is any substance produced by a prokaryote that is antagonistic to the growth of other viruses. c. An antibiotic is any substance produced by a prokaryote that is antagonistic to the growth of eukaryotic cells. d. An antibiotic is any substance produced by a prokaryote that prevents growth of the same prokaryote.arrow_forwardWhich of the following statements is correct? Please select all that apply. Select one or more: a. Parasitism between bacteria and archaea caused complex interactions that eventually gave rise to eukarya. b. While bacteria are prokaryotes, archaea are neither prokaryotic, nor eukaryotic but classified as a 3rd cell type. c. Prokaryotes are classified further based on whether they are unicellular or multicellular organisms. d. The molecular biologies of archaea and eukarya show a greater proportion of similarities than those of eukarya and bacteria. e. Prokaryotes could not make photosynthesis until chloroplast endosymbiosis evolution. f. The last universal common ancestor most likely had a primitive prokaryotic cell organization. g. Endosymbiosis of chloroplast precedes that of mitochondria.arrow_forward
- which of the following definitions is not technically correct? a. broad spectrum - effective against many different types of microbes b. bacteriostatic - prevents microbes from growing c. antibiotic - microbial or synthetic product that kills or inhibits growth of microbes. d. all of the above are correctarrow_forwardBacteria that can survive in extreme environments are called: a-Anaerobes b-Saprophytes c-Aerobes d-Archaebacteriaarrow_forwardWhich of the following statements are TRUE about organisms in the Domain Bacteria? I. Consist of bacteria and cyanobacteria II. Some are photoautotrophs III. Genetic material is a single stranded DNA IV. Organelles are not presentarrow_forward
- If all prokaryotes on Earth suddenly vanished, which of the following would be the most likely and most direct result? O a. There would be no more pathogens on Earth. O b. Human populations would thrive in the absence of disease. O c. Bacteriophage numbers would dramatically increase. Od. The recycling of nutrients would be greatly reduced, at least initially. Next pagearrow_forwardWhat part of an animal USUALLY do not have microbes? A. Teeth B.Genitalia C. Lungs D. Gastrointestinal tractarrow_forwardWhich of the following statements is true? A. Archaea and bacteria have identical membrane lipids. B. The cell walls of archaea lack peptidoglycan. C. Prokaryotes have low levels of genetic diversity. D. No archaea are capable of using CO2 to oxidize H2 releasing methane.arrow_forward
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