Which correctly characterizes the difference between gram+ and gram- bacteria? Group of answer choices gram+ have circular chromosomes, gram– have linear chromosomes gram+ have peptidoglycan, gram– have pseudomurein gram+ have ester-linked lipids, gram– have ether-linked lipids gram+ have a thick layer of peptidoglycan and gram– have thinner layer of peptidoglycan

Which correctly characterizes the difference between gram+ and gram- bacteria? Group of answer choices gram+ have circular chromosomes, gram– have linear chromosomes gram+ have peptidoglycan, gram– have pseudomurein gram+ have ester-linked lipids, gram– have ether-linked lipids gram+ have a thick layer of peptidoglycan and gram– have thinner layer of peptidoglycan

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter13: Diversity Of Microbes, Fungi, And Protists

Section: Chapter Questions

Problem 1ACQ: Figure 13.6 Which of the following statements is true? a. Gram-positive bacteria have a single cell...

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You conduct a gram stain on a bacterial culture. After counterstaining with safranin, cells are purple. What statements are true about the bacterial cells? (Choose all that are true.) Group of answer choices The cell wall of these cells helps to maintain cell shape and protect the cell from osmotic lysis. The cells have teichoic acids that have many important functions in gram positive bacteria Cells have a periplasmic space and a thin layer of peptidoglycan. The cells produce endotoxin (LPS) and may cause septic shock in an infected individual.
Which term best describes the morphology of this bacteria? Question 2 options: spiral bacillus diploid flagellate aggregation
O intermediate Question 10 Why are most Gram-negative bacteria resistant to penicillin? O endopsores made by Gram-negative bacteria are resistant to penicillin O the outer membrane of Gram-negative cell wall prevents diffusion of penicillin the waxy cell wall of Gram-negative bacteria prevents diffusion of penicillin Gram-negative bacteria have thick layers of peptidoglycan which prevents diffusion of penicillin Question 11
Figure 13.6 Which of the following statements is true? a. Gram-positive bacteria have a single cell wall formed from peptidoglycan. b. Gram-positive bacteria have an outer membrane. c. The cell wall of Gram-negative bacteria is thick, and the cell wall of Gram-positive bacteria is thin. d. Gram-negative bacteria have a cell wall made of peptidoglycan, while Gram-positive bacteria have a cell wall made of phospholipids.
Which 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 peptidoglycan
Several students argued about why Gram-positive cells stain purple with the Gram stain whereas Gram-negative cells stain pink. Which explanation is correct? Multiple Choice Alcohol dehydrates peptidoglycan; the thick layer of dehydrated peptidoglycan in Gram-negative cells prevents the crystal violet from being washed out Safranin stains lipopolysaccharide, and because only Gram-negative cells have lipopolysaccharide, those cells look pink. Safranin stains lipopolysaccharide, and because only Gram-negative cells have lipopolysaccharide, those cells look pink. Alcohol dehydrates peptidoglycan; the thick layer of dehydrated peptidoglycan in Gram-positive cells prevents the crystal violet from being washed out. Crystal violet specifically stains peptidoglycan, and because Gram-positive cells have a thicker peptidoglycan layer those cells look purple. Alcohol destroys lipopolysaccharide in Gram-negative cell walls, allowing safranin to enter the cells and staining them pink.
Microbiologists use the Gram stain to differentiate among two groups of bacteria. How do Gram-positive and Gram-negative bacteria differ? Question 1 options: the presence or absence of peptidoglycan in the cell wall the presence or absence of muramic acid in the cell wall the presence or absence of outer plasma membrane the lipid composition of plasma membrane none of the above.
How does the shape of a bacteria cell affect the bacteria’s survival in the environment? To answer this question: Calculate the surface-to-volume ratio of a coccus, assuming it is a perfect sphere. Where radius (r) = 0.91 μm. surface-to-volume ratio of a coccus = ________________ Calculate the surface-to-volume ratio of a bacillus, assuming it is a cylinder. Where r = 0.5 μm and height (h) = 4 μm surface-to-volume ratio of a bacillus = _________________________ The values provided for the radius of the coccus and the radius and height for the bacillus will give approximately the same volume for the coccus and the bacillus. However, the surface area will differ. Now compare the surface-to-volume ratio of a coccus to a bacillus calculated with these values. Which has the higher surface area for the same amount of volume? Considering the coccus and bacillus of equal volume from the question above, Which is more likely to survive in a dry environment? Explain your answer.…
If bacteria are nonmotile, what can be inferred? Question 3 options: Mimimal number of flagella renders their body nonmotile. They lack motility structure to propel their multicellular body. Absence of flagella deprives them function of locomotion. The flagella at one end of their body make them nonmotile.
For the following questions referring to cell types and structures, please use the image below for reference. Questions that refer to Cell #1, Cell #2, or Cell #3 are indicating that you should look at the following image to help answer the question. Cell #1 Cell #2 Cell #3 Cell membrane Nucleus - Nucleus DNA Cell Wall Cell Wall Mitochondrion : Cll Mitochondrion membrane Cll Chloroplast membrane
The following table depicts characteristics of five prokaryotic species (1-5). Use the information in the table to answer the following question. Species 1 Species 5 None Trait Plasmid Gram Staining Results Nutritional Mode Species 2 None Species 3 R Species 4 IF Positive Positive Negative Negative Negative Chemohetero- Chemoauto- troph Chemohetero- Chemohetero- Photoauto- troph Anaerobic troph troph troph Aerobic Specialized methanotroph Metabolic (obtains carbon Pathways and energy from methane) Anaerobic methanogen Anaerobic alcoholic fermentation Anaerobic lactic nitrogen fixation acid fermentation and aerobic photosystems I and II Other Features All of the species shown have a cell wall that consists partly of an outer membrane of lipopolysaccharide EXCEPT Internal membranes Fimbriae Flagellum Pili Thylakoids species 1 only species 2 only species 3, 4, and 5 species 1 and 2 only 0 O 0 0
Which statement about the cellular arrangments of bacteria is NOT correct? Spiral bacteria are typically single. A diplobacillus arrangement consists of two cocci adhering to one another. A chain of bacilli is called a streptobacillus arrangement. A cube-shaped arrangement of cocci is a sarcina. A square-shaped arrangement of cocci is a tetrad.