Penicillin is an antibiotic that prevents what?
a. cell membrane transport
b. ribosomes from making protiens
c.cell walls from being formed
d. flagella from being formed
Answers:
c) cell wall formation
Main article: Beta-lactam antibiotic
β-lactam antibiotics work by inhibiting the formation of peptidoglycan cross-links in the bacterial cell wall. The β-lactam moiety (functional group) of penicillin binds to the enzyme (DD-transpeptidase) that links the peptidoglycan molecules in bacteria, which weaken the cell wall of the bacterium (in other words, the antibiotic causes cytolysis or death due to osmotic pressure). In addition, the build-up of peptidoglycan precursors triggers the activation of bacterial cell wall hydrolases and autolysins, which further digest the bacteria's existing peptidoglycan.
Gram-positive germs are called protoplasts when they lose their cell wall. Gram-negative bacteria do not lose their cell wall completely and are called spheroplasts after treatment beside penicillin.
Penicillin shows a synergistic effect with aminoglycosides, since the inhibition of peptidoglycan synthesis allows aminoglycosides to penetrate the bacterial cell wall more easily, allowing its disruption of bacterial protein synthesis inside the cell. This results in a lowered MBC for susceptible organisms.
Penicillins, like other β-lactam antibiotics, not only block the division of germs, including cyanobacteria, but also the division of cyanelles, the photosynthetic organelles of the Glaucophytes, and the division of chloroplasts of bryophytes. In contrast, they have no effect on the plastids of the highly developed vascular plants. This supports the endosymbiotic theory of the evolution of plastid division contained by land plants.[20] Source(s): google search
c.cell walls from being formed
This class (the β-lactam antibiotics) work by inhibiting the formation of peptidoglycan cross links surrounded by the bacterial cell wall. Source(s): Goodman & Gilman's
c
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b. ribosomes from making protiens
c.cell walls from being formed
d. flagella from being formed
Answers:
c) cell wall formation
Main article: Beta-lactam antibiotic
β-lactam antibiotics work by inhibiting the formation of peptidoglycan cross-links in the bacterial cell wall. The β-lactam moiety (functional group) of penicillin binds to the enzyme (DD-transpeptidase) that links the peptidoglycan molecules in bacteria, which weaken the cell wall of the bacterium (in other words, the antibiotic causes cytolysis or death due to osmotic pressure). In addition, the build-up of peptidoglycan precursors triggers the activation of bacterial cell wall hydrolases and autolysins, which further digest the bacteria's existing peptidoglycan.
Gram-positive germs are called protoplasts when they lose their cell wall. Gram-negative bacteria do not lose their cell wall completely and are called spheroplasts after treatment beside penicillin.
Penicillin shows a synergistic effect with aminoglycosides, since the inhibition of peptidoglycan synthesis allows aminoglycosides to penetrate the bacterial cell wall more easily, allowing its disruption of bacterial protein synthesis inside the cell. This results in a lowered MBC for susceptible organisms.
Penicillins, like other β-lactam antibiotics, not only block the division of germs, including cyanobacteria, but also the division of cyanelles, the photosynthetic organelles of the Glaucophytes, and the division of chloroplasts of bryophytes. In contrast, they have no effect on the plastids of the highly developed vascular plants. This supports the endosymbiotic theory of the evolution of plastid division contained by land plants.[20] Source(s): google search
c.cell walls from being formed
This class (the β-lactam antibiotics) work by inhibiting the formation of peptidoglycan cross links surrounded by the bacterial cell wall. Source(s): Goodman & Gilman's
c
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