1.since gram negative bacteria contain less peptidogylcan unlike gram positive bacteria and have lipo polysaccharide (LPS) in their cell wall they are more resistant to antimicrobial agents.
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1. Why are gram-negative bacterial more resistant than gram-positive bacteria to antimicrobial that attacks cytoplasmic targets?...
43.Lipopolysaccharides (LPS) are found in: a. Gram-positive bacteria b. Gram-negative bacteria c. all Bacteria d. Archaea e. Eukaryotes ------------------------- 44. There are similarities and differences between Gram-negative and Gram-positive bacteria. Which of the following is not true? a. The cell wall of Gram-negative cells is composed of only one or two layers of peptidoglycan whereas the cell walls of Grampositive bacteria have many peptidoglycan layers b. Only Gram-positive bacterial cells have a periplasm 2/6/18 8 c. The cell membranes of...
2) List the major targets of an antimicrobial drug. What do all of these targets have in common? 3) Why is the Kirby-Bauer test standardized? 4) What is the advantage of the broth dilution tests for antibiotic sensitivity over the Kirby Bauer? 5) In general, why are Gram negative bacteria resistant to some of the antibiotics that Gram positive bacteria are sensitive to? 6) Fill in the following chart. ANTIBIOTIC CELLULAR TARGET AMPICILLIN CHLORAMPHENICOL ERYTHROMYCIN GENTAMICIN PENICILLIN STREPTOMYCIN TETRACYCLIN VANCOMYCIN
Gram-positive and gram-negative bacteria differ in that A. Gram-positive bacteria have more peptidoglycan in their cell walls. B. Gram-positive bacteria have fimbriae but gram-negative bacteria do not. C. Gram-positive bacteria are spiral-shaped, and gram-negative bacteria are either rod-shaped or spherical. D. Only gram-negative bacteria can form endospores. E. There is no difference between gram negative and gram positive bacteria F. Gram positive are positively charged and gram negative are negatively charges An unknown bacterial species was found in the blood...
QUESTION 2 Which of the following antimicrobial agents works directly on bacteria by interfering with cellular processes? disinfectants O antibiotics O antiseptics QUESTION 3 Amoxicillin was less effective on E. coli than S. mutans because (choose all that apply) amoxicillin targets bacterial ribosomes amoxicillin targets peptidoglycan E. coli is gram negative E. coli is gram positive
2) List the major targets of an antimicrobial drug What do all of these ta common? all of these targets have in 3) Why is the Kirby-Bauer test standardized? 4) What is the advantage of the broth dilution tests for antibiotic sensitivity over Kirby Bauer? 5) In general, why are Gram negative bacteria resistant to some of the antibiotics that Gram positive bacteria are sensitive to? 6) Fill in the following chart. ANTIBIOTIC CELLULAR TARGET AMPICILLIN CHLORAMPHENICOL ERYTHROMYCIN GENTAMICIN PENICILLIN...
An antiseptic such as 70% alcohol dissolves lipids. It was observed that Gram-positive bacteria were more resistant to alcohol than Gram-negative bacteria. Is this an expected result? Why or why not, explain in detail.
choose: which defense mechanism is more effective against gram positive bacteria than gram negative bacteria? a- inflammation b- B-galactosidase c- peptidyl transferase d- lysozyme
1) Antimicrobial X targets a specific protein in the cytoplasm of the bacterial cell, causing the bacteria to stop growing, but does not kill them. A few bacteria start to grow in the presence of antibiotic X. Analysis of the bacteria that can now grow shows that they have changed the shape of the target for antimicrobial X. What conclusion can be made? a) The change in shape of the target for antimicrobial X had no effect on the effectiveness...
Pre-Lab Questions: After staining what color will Gram positive bacteria be? What color will Gram negative bacteria be? What structure is more prominent in Gram positive bacteria than Gram negative bacteria? Why should I not spray water aggressively or directly on my bacteria on my slide?
Why do the phycobilins found in red algae trap more light energy than chlorophyll in deep water? Which of the green algae are motile? How do these organisms move? How are the pseudopodia of these amoebas different than the pseudopodia of Foramens and Radiolarians? Can you see any internal structures in the bacteria? Why or why not? Given the differences between bacterial and animal cells as previously discussesed, what aspects of abcterial structure might be good targets for antimicrobial agents?...