icrobiologists have announced the discovery of over 30 new species of bacteria that thrive between the teeth and gums of humans. The bacteria could not be grown in the researcher's laboratories, nor were any of them ever observed via and kind of microscopy. If they couldn't culture them or see them, how could the researchers know they discovered a new species? If they couldn't examine the cells for the presence of a nucleus, how did they determine that the organisms were prokaryotes and not eukaryotes?

icrobiologists have announced the discovery of over 30 new species of bacteria that thrive between the teeth and gums of humans. The bacteria could not be grown in the researcher's laboratories, nor were any of them ever observed via and kind of microscopy. If they couldn't culture them or see them, how could the researchers know they discovered a new species? If they couldn't examine the cells for the presence of a nucleus, how did they determine that the organisms were prokaryotes and not eukaryotes?

Biology Today and Tomorrow without Physiology (MindTap Course List)

5th Edition

ISBN:9781305117396

Author:Cecie Starr, Christine Evers, Lisa Starr

Publisher:Cecie Starr, Christine Evers, Lisa Starr

Chapter3: Cell Structure

Section: Chapter Questions

Problem 1VQ: What type of micrograph is shown below? Is the organism pictured prokaryotic or eukaryotic? How can...

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Microbiologists announced the discovery of over 30 new species of bacteria that thrivebetween the teeth and gums of humans. The bacteria could not be grown in the researchers’ laboratories,nor were any of them ever observed via any kind of microscopy. If they couldn’t culture them or see them,how could the researchers know they had discovered new species? If they couldn’t examine the cells for thepresence of a nucleus, how did they determine that the organisms were prokaryotes and not eukaryotes?
A scientist isolates a new species of prokaryote. He notes that the specimen is a bacillus with a lipid bilayer and cell wall that stains positive for peptidoglycan. Its circular chromosome replicates from a single origin of replication. Is the specimen most likely an Archaea, a Gram-positive bacterium, or a Gram-negative bacterium? How do you know?
It is 0.4 um in length, but that is all you know. What could you do to determine if this microbe was a bacteria or an archaea?
What type of micrograph is shown below? Is the organism pictured prokaryotic or eukaryotic? How can you tell?
In the experiment by Bernard Davis, bacterial F+cells and F- cells were growing while separated by a filter. Filter pores allowed the passage of the liquid medium but not the bacteria cells. As a result: 1) prototype colonies grew well on minimal medium 2) F+ cells were converted to F- cells despite the physical separation 3)F- cells were converted F+ cells despite the physical separation 4)F+ cells were not converted to F- cells because of the physical separation 5) F- cells were not converted to F+ cells because of the physical separation 6)there was no growth of prototypes on minimal medium
Alexander Fleming was working with bacteria called staphylococcus, which looked like bunches of grapes under the microscope. He could grow colonies of these bacteria on petri dishes with a growth medium. When he returned from vacation, he found that several of these dishes had become contaminated with a fungus. The colonies near where the fungus was growing had been destroyed. Fleming then grew the mold and purposefully added it to a petri dish that contained bacteria colonies. The colonies exposed to the mold died. Fleming named the substance within the mold that killed bacteria "penicillin." REASONING: If mold contains a substance that kills bacteria, then ... a) bacteria exposed to mold would be destroyed b) bacteria could be grown on a growth medium c) fungus can be grown as easily as bacteria
1.) Your roommate has noticed that you now spend most of your time studying microbiology and has become curious about the subject. She asks you to explain in the simplest possible way how prokaryotes differ from eukaryotes. What do you tell her? 2.) In the advent of COVID-19, what physical method and chemical agent do you think is the most effective method in controlling the spread of the disease? Justify your answer.
Most bacteria require a water activity of 0.9 or higher to grow. A prolonged period of being dry usually causes loss of viability. How were there still living bacteria in many of the dried foods such as dried rice, dehydrated coconut flakes, raisins, etc.? Discuss.
Why do we use an Electron Scanning Microscope to see bacteriophages over other microscopes?
Some groups of bacteria can go dormant during periods of environmental stress through the formation of _______. A) magnetosomes B) peptidoglycan C) endospores D) pili
30) A water sample from a hot thermal vent contained a single-celled organism that had a cell wall but lacked a nucleus. What is its most likely classification? A) Eukarya B) Archaea C) Animalia D) Protista E) Fungi 31) To establish a link between a specific bacterium and a skin disease, researchers have shown that the bacterium was present in sick persons but not in healthy individuals. They isolated the bacterium in a pure culture and demonstrated that experimental healthy animals injected with this culture became sick. What other experiment do researchers need to perform to be absolutely sure that the bacterium is responsible for the disease? A) Demonstrate that the bacterium belongs to the pathogenic lineage B) Demonstrate that the bacterium is not able to live outside of humans or animals C) Isolate bacterium from an infected sick animal and demonstrate that it is the same bacterium as the one used for infection D) Isolate bacterium from an infected sick animal and demonstrate…
Bacterial growth depends on many environmental factors, including the temperature of the environment. Since microbes can survive in a certain range of temperatures and will thrive at a temperature, understanding these variables allows for control of their growth. This understanding can be used, for example, to preserve certain foods or to treat infections. This lab simulation will use an instrument called a spectrophotometer. This instrument quantitatively measures the amount of light that is absorbed or transmitted by molecules in solution a) In your own words give an introduction to the microbial growth and the effect tempature has. b) In your own words explain the importance of the spectrophotometer in regards to microbial growth. c) In your own words give a hypothesis on how bacteria will react to different temperatures.