Why are most Gram-negative bacteria resistant to penicillin? the outer membrane of Gram-negative cell wall prevents diffusion of penicillin O endopsores made by Gram-negative bacteria are resistant to penicillin the waxy cell wall of Gram-negative bacteria prevents diffusion of penicillin O Gram-negative bacteria have thick layers of peptidoglycan which prevents diffusion of penicillin

Why are most Gram-negative bacteria resistant to penicillin? the outer membrane of Gram-negative cell wall prevents diffusion of penicillin O endopsores made by Gram-negative bacteria are resistant to penicillin the waxy cell wall of Gram-negative bacteria prevents diffusion of penicillin O Gram-negative bacteria have thick layers of peptidoglycan which prevents diffusion of penicillin

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter22: Prokaryotes: Bacteria And Archaea

Section: Chapter Questions

Problem 2VCQ: Figure 22.16 Which of the following statements is true? Gram-positive bacteria have a single cell...

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Figure 22.16 Which of the following statements is true? Gram-positive bacteria have a single cell wall anchored to the cell membrane by lipoteichoic acid. Pori ns allow entry of substances into both Gram-positive and Gram-negative bacteria. The cell wall of Gram-negative bacteria is thick, and the cell wall of Gram-positive bacteria is thin. Gram-negative bacteria have a cell wall made of peptidoglycan, whereas Gram positive bacteria have a cell wall made of lipoteichoic acid.
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.
Figure 22.8 Compared to free-floating bacteria, bacteria in biofilms often show increased resistance to antibiotics and detergents. Why do you think this might be the case?
Some bacteria have a tube which allows materials to move directly into or out of the cytoplasm. This tube is called a ___. cilium flagellum genera pilus
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
Which 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 above
Gram-negative bacteria are not killed by penicillin because they: do not have ribosomes. have an outer membrane layer covering their peptidoglycan cell wall. have two layers of peptidoglycan. do not have peptidoglycan. their ribosomes are protected with their own outer membrane layer.
How do Gram-negative bacteria differ from Gram-positivebacteria?a. They are not pathogenic.b. Their peptidoglycan cell wall is thinner.c. Gram-negative bacteria cannot be Gram stained.d. They possess a single plasma membrane.e. Gram-negative bacteria do not photosynthesize.
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.
Which of the following is NOT a characteristic for bacteria in general? a. Plasma membrane has no saccharide units b. Sterols is one of its major outer membrane component c. Genome present in the nucleiod region of the cytosol d. Granules are mostly polysaccharide in nature
Which of the following is NOT true about gram-positive and gram-negative bacteria? a. None of the other four answers (all are true) b. Gram-negatives have thicker cell walls than gram-positives c. Cell walls are made of peptidoglycan in both gram-positives and gram-negatives d. Peptidoglycan has a carbohydrate (NAG/NAM) backbone cross-linked by chains of amino acids e. Gram-negatives have an outer membrane outside of the cell wall, composed of lipopolysaccharide
A type of cell wall that is often toxic. Question options: a) gram-positive b) gram-negative c) acid-fast d) mycoplasma