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Which of the following statements is NOT a characteristic of the B subunit of A-B toxins?...

Which of the following statements is NOT a characteristic of the B subunit of A-B toxins?

A) helps facilitate translocation of A subunit into host cell cytoplasm

B) Contains toxin/enzymatic activity

C) Can interact with the A subunit through covalent or non-covalent interactions, depending on the specific toxin structure

D) All of these statements are incorrect

E) All of these statements are correct

F) Binds to specific host cell surface receptors

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Answer #1

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The A-B toxin is used by bacteria to enter in the host and release toxin in the host cell to cause infection. In the A-B toxins system, the A is an enzyme or toxin that is teansferred to the host cell with the help of B proteins. Also, B protein make a non-covalent interaction with A protein only. Therefore, all statement are false. Hence, option D is correct.

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