Principles of Biology
2nd Edition
ISBN: 9781259875120
Author: Robert Brooker, Eric P. Widmaier Dr., Linda Graham Dr. Ph.D., Peter Stiling Dr. Ph.D.
Publisher: McGraw-Hill Education
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Chapter 23, Problem 3TY
Summary Introduction
Introduction:
Bacteria are a small prokaryotic organism, but many of these bacteria are pathogenic in nature. Some bacteria produce thick-walled cells that are able to survive under unfavorable conditions in a dormant state.
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Mycoplasmas are bacteria that lack cell walls. On the basis of this structural feature, which statement concerning mycoplasmas should be true?
They are gram-negative.
They are subject to lysis in hypotonic conditions.
They lack a cell membrane as well.
They should contain less cellulose than do bacteria that possess cell walls.
They possess typical prokaryotic flagella.
Which of the following statement/s is/are true about gram negative bacteria
Cell wall has thin peptidoglycan layer
Cell wall lipid content is very low
Lipopolyscharride layer is present
All of the above
Explain the importance of the Gram positve structure:- They contain a thick peptidoglycan layer and cytoplasmic lipid membrane.- These bacteria lack an outer membrane.- Have a lower lipid content and more teichoic acids.- They move around with the help of locomotion organs such as cilia and flagella.
Chapter 23 Solutions
Principles of Biology
Ch. 23.1 - Prob. 1TYKCh. 23.1 - Prob. 2TYKCh. 23.2 - Prob. 1TYKCh. 23.2 - Prob. 2TYKCh. 23.3 - Prob. 1CCCh. 23.3 - Prob. 1TYKCh. 23.3 - What essential role did early alphaproteobacteria...Ch. 23.4 - Prob. 1CCCh. 23.4 - Which structure is associated with motility in one...Ch. 23.5 - In which of the hosts does sexual mating of P....
Ch. 23.5 - Prob. 1TYKCh. 23.6 - Prob. 1CCCh. 23.6 - Prob. 2CCCh. 23.6 - Prob. 1BCCh. 23.6 - Prob. 1TYKCh. 23.7 - Prob. 1TYKCh. 23 - Prob. 1TYCh. 23 - Prob. 2TYCh. 23 - Prob. 3TYCh. 23 - Prob. 4TYCh. 23 - Prob. 5TYCh. 23 - The protists most closely related to the fungal,...Ch. 23 - Prob. 7TYCh. 23 - Prob. 8TYCh. 23 - People use bacteria, protists, or fungi to: make...Ch. 23 - Prob. 1CCQCh. 23 - Prob. 2CCQCh. 23 - Prob. 3CCQCh. 23 - Prob. 1CBQCh. 23 - Prob. 2CBQ
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- A particular bacterium is said to have a streptococcus morphology and arrangement. What does this mean? the cells are rod shaped and occur in clusters the cells are round and occur in chains the cells are round and occur in clusters the cells are spiral and occur singulararrow_forwardYou are studying a new bacteria isolated from the soil by identifying the cellular structures that it makes. The presence of which of the following would indicate that your organism must be a Gram-positive bacterium? It has a cell wall with teichoic acids It has a polyhydroxyalkanoate storage granule It has an outer membrane with LPS It has a flagellaarrow_forwardWhich of the following statement/s is/are true about gram positive bacteria Cell wall has thick peptidoglycan layer Cell wall lipid content is very low Lipopolyscharride layer is absent All of the abovearrow_forward
- A microbiologist is working with a pure strain of bacteria isolated from a mixed sample. Which of the following would indicate that the bacterium is NOT Helicobacter pylori? Cells have flagella when viewed by flagellar staining. Secretes acids produced from metabolism of sucrose. Cells are curved rods. Produces and secretes urease enzyme. Cells stain Gram negative.arrow_forwardWhich of the following is not true about a gram-positive cell wall? It has plasma membrane inside cell wall It contains lipopolysaccharides (LPS) It maintains the shape of the cell It contains teichoic acidsarrow_forwardBacteria in the phylum Firmicutes are distinguished from the phylum Actinobacteria on the basis of their spiral shapes. the presence of LPS in their membranes. their Gram stain reaction. the low G + C content of their DNA. the high G + C content of their DNA.arrow_forward
- These structures allow a bacterium to move through an aqueous environment: spores cilia flagella capsules fimbriaearrow_forwardThe anaerobic Clostridium species are troublesome pathogens largely because of their capacity for biofilm production. rapid reproduction. high salt tolerance. endospore production. oxygen production.arrow_forwardDiseases that involve biofilm-producing bacteria are of serious concern. They are not as easily treated compared with those involving free-floating (or planktonic) bacteria. Explain three reasons why biofilm formers are more pathogenic. Brian goes to the hospital after not feeling well for a week. He has a fever of 38 °C (100.4 °F) and complains of nausea and a constant migraine. Distinguish between the signs and symptoms of disease in Brian’s case.arrow_forward
- Which of the following is NOT a characteristic for bacteria in general? Plasma membrane has no saccharide units Sterols is one of its major outer membrane component Genome present in the nucleiod region of the cytosol Granules are mostly polysaccharide in naturearrow_forwardWhich of the following correctly describes one difference between gram-positive bacterial cells and gram-negative bacterial cells? Gram-positive bacteria have less peptidoglycan Gram-positive bacteria can all form endospores Gram-positive bacteria have a thicker cell membrane Gram-positive bacteria have more peptidoglycanarrow_forwardOne major difference in the envelope structure between gram positive bacteria and gram-negative bacteria is the presence or absence of a cytoplasmic membrane. True or false?arrow_forward
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