Diphtheria Toxin Is Extremely Potent and Only a Few Micrograms

question 37

Multiple Choice

Diphtheria toxin is extremely potent and only a few micrograms causes death because it:

• A) inhibits f-Met-tRNA_i^met binding.
• B) is an enzyme and can catalytically modify a number of GTP-dependent enzymes.
• C) inhibits translocation of peptidyl-tRNA.
• D) catalyzes inactivation of 28 S tRNA.
• E) inhibits EF-G:GTP dissociation from ribosomes.

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