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Old 08-04-2011
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Biochemistry Saliva and Tears Enzyme that can break bacterial cell wall!

An enzyme found in tears and saliva is known to damage bacterial cell walls. It does this by

a) dissolving the cytoplasmic membrane
b) breaking the covalent links between teichoic acid and muramic acid
c) hydrolyzing the link between N-acetyl glucosamine and N-acetyl muramic acid
d) inhibiting cell wall protein synthesis
e) converting D-alanine to L-alanine
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Old 08-04-2011
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answer is C...bcoz i think saliva and tears have amylase...just guess!!!
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Old 08-04-2011
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c) hydrolyzing the link between N-acetyl glucosamine and N-acetyl muramic acid
LYSOZYME?
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Correct c) hydrolyzing the link between N-acetyl glucosamine and N-acetyl muramic acid.
Lysozyme is a small 14 kDa protein found in tears. It contains 4 disulfide bonds and its secondary structure is both helical and sheet. It hydrolyzes the bond between NAG subunits in bacterial cell walls and therefore serves as a defence mechanism
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Last edited by USMLE2011m; 08-04-2011 at 01:12 PM.
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b) breaking the covalent links between teichoic acid and muramic acid
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Old 08-05-2011
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Quote:
Originally Posted by plasticsurgeon View Post
b) breaking the covalent links between teichoic acid and muramic acid

Sorry, but the answer is C , please look at the post above for the answer and explanation. Hope it helps.
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Biochemistry-, Gastrointestinal-Tract-, Microbiology-, Step-1-Questions

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