Microbiology: Principles and Explorations
9th Edition
ISBN: 9781118743164
Author: Jacquelyn G. Black, Laura J. Black
Publisher: WILEY
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Chapter 4, Problem 6SQ
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Bacteria of the genus Mycoplasma are distinguished from other bacterial cells by
1) cell walls composed solely of amino acids.
O 2) the absence of a cytoplasmic membrane.
O 3) the absence of a cell wall.
O 4) Have large capsules.
5) the presence of mycolic acid in their cell walls.
1.Most human bacterial pathogens are labeled as __ according to their temperature requirement: a) Aerophiles b) Aerobes c) Anaerobes d) Psychrophiles e) Mesophiles.2) The current model that describes the contents of the plasma membrane is best described as _______ model: a) Sandwich b) fluid-mosaic c) unit membrane d) ions and pumps e) semipermeable3) Bacterial cells that do not have the SOD & catalase enzymes are labeled as: a) Aerophiles b) Aerobes c) Anaerobes d) Complex e) Mesophiles.
Which statement among A-D is false regarding bacterial toxins?
A) O Hemolysıns are cell membrane disrupters that can rupture red blood cells.
B) O Second mesengar pathway disrupters like cholera toxin produces a debilitating respiratory condition of the lungs.
C) O Shiga toxin, tetanus toxin, and hemolysins are all types of exotoxins.
D) O Superantigens elicit a hyperactive response by the immune system and can lead to shock.
E) O None are false, A-D are all true statements.
Chapter 4 Solutions
Microbiology: Principles and Explorations
Ch. 4 - Are viruses prokaryotes? Eukaryotes? Why or why...Ch. 4 - Compare surface-to-volume ratios of prokaryotes...Ch. 4 - Prob. 1.3SCCh. 4 - Prokaryotes lack mitochondria. What structure does...Ch. 4 - Compare peptidoglycan and teichoic acid as to...Ch. 4 - What takes place in the periplasmic space? Which...Ch. 4 - Prob. 2.3SCCh. 4 - Compare the cell walls of Gram-positive,...Ch. 4 - How do bacteria move in chemotaxis? Distinguish...Ch. 4 - Prob. 3.2SC
Ch. 4 - Prob. 3.3SCCh. 4 - Distinguish between nucleus and nucleoid.Ch. 4 - Most prokaryotes lack sterols in their plasma...Ch. 4 - Prob. 4.2SCCh. 4 - Give two specific arguments that support the idea...Ch. 4 - Prob. 1CCSCh. 4 - Your roommate has noticed that you now spend most...Ch. 4 - Many of todays antibacterial drugs work by...Ch. 4 - According to the endosymbiotic theory, the...Ch. 4 - Most prokaryotes range in size from 0.5 to 2.0 m,...Ch. 4 - Attribute each of the following to either P,...Ch. 4 - Match the following bacterial morphology...Ch. 4 - Which of the following statement about the...Ch. 4 - Bacteria such as Mycoplasma that lack cell walls...Ch. 4 - Prob. 6SQCh. 4 - Prob. 7SQCh. 4 - Match the following bacterial locomotion and...Ch. 4 - Prob. 9SQCh. 4 - Prob. 10SQCh. 4 - Prob. 11SQCh. 4 - Prob. 12SQCh. 4 - Glucose is often present in very low...Ch. 4 - Prob. 14SQCh. 4 - Peptidoglycan digested from Gram-______ bacteria...Ch. 4 - Prob. 16SQCh. 4 - Prob. 17SQCh. 4 - Prob. 18SQCh. 4 - Mitosis differs from meiosis in the following ways...Ch. 4 - For each of the lettered regions identified on...
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- 3. A division in Eukaryotes that involves nuclear division without a cytokinesis will lead to the formation of: a) Baeocyte b) Mycellia c) Syncitium d) Myofibril e) all the above 4) All the following are critical factors in determining the effectiveness of an antimicrobial agent except: a) Population size b) Species c) Location d) pH e) Temperaturearrow_forwardSalmonella typhi has the ability to persist within the gall-bladder of humans while causing no clinical symptoms.The infected individual is still contagious, however, andwould be considered a(n):(a) Pathogen(b) Nuisance(c) Endemic(d) Carrier(e) Bacteriophagearrow_forwardEndotoxins are A) O Associated with lipid A of the LPS layer. B) ) O Secreted from the cell. C) O Part of the thick peptidoglycan layer of gram-positive bacteria. D) O Associated with gram-negative bacter1a E) O Two of the above are correctarrow_forward
- 19) in mammalian cell culture which of the following are necessary to maintain a) nutrient media b) growth factors c) temperature d) solid substrate to attack to e) all of these f) none of thesearrow_forwardWhich of the following statements is not correct formethanogens?(a) They are archaebacteria.(b) They live in marshy areas.(c) Methane is their preferred carbon source.(d) They are present in guts of several ruminant animals(cow, buffaloes) and produce biogas (CH4) from thedung of these animals. Please try to break the solutions into as many steps as practically possible and the steps should come one by one and they should be short and crisp and plagiarism-free.arrow_forwardYou perform a Gram staining technique on two bacterial species and observe that one is stained purple while the other is stained pink. Which of the following is consistent with this observation? a) The purple one is likely more resistant to penicillin b) Both bacteria have a cell wall made of mycolic acid c) Their peptidoglycan layers have the same thickness d) They differ in the number of phospholipid membranes e) One has a monolayer of phospholipids while the other has a bilayer of phospholipidsarrow_forward
- 17) The peptidoglycan layers are anchored to the cell membrane by: a) tetrapeptide chain b) dipeptide molecule c) teichoic acid d) lipoteichoic acid e) c & d18) The peptidoglycan region in Gram +Ve bacteria is strengthened with ___ cross bridges of: a) Lipopolysaccahride b) Archaeol c) Hopanoids d) Polypeptides e) FtsZ19) The fluid or region present between the inner membrane and the outer membrane of some bacteria is called: a) periplasm b) ectoplasm c) circumplasm d) lophoplasm e) amphiplasmarrow_forwardBacteria such as Mycoplasma that lack cell walls are:(a) Sensitive to penicillin(b) Resistant to penicillin(c) Protected from adverse conditions by a waxy, acid-fastcoating(d) Obligated to live inside of other cells as endosymbiontsarrow_forwardAdherence to the intestinal lining by a bacterium may be due to its possession of _____. A) endospores B) pili C) a flagellum D) F+ plasmidarrow_forward
- An organism of the genus Staphylococcus is ________, while an organism of the genus Spirochaeta is ________. A) spherical / rod shaped B) rod shaped / coiled C) spherical / coiled D) coiled / sphericalarrow_forwardWhich type of bacteria is responsible for producing ex-tremely toxic sulfuric acid?(a) Thiobacillus (d) Sulfur-oxidizing(b) Sulfate-reducing (e) a and d(c) Sulfur-reducingarrow_forwardCephalosporins resemble which antibiotic in their mode ofaction and their structure?(a) Penicillin(b) Bacitracin(c) Streptomycin(d) Polymyxin(e) Tetracyclinearrow_forward
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