Question

1. Which of the following strategies are used by some microbes to evade complement”

   1. Interfere with complement activation by the classical pathway

   2. Produce proteins that bind and inactivate complement proteins

   3. Produce proteases that destroy complement proteins

   4. Produce proteins that mimic or bind complement regulatory proteins

   5. All of the above are correct.

2. With respect to the T cell receptor, TCR:

   2. One gene encodes the ɑ subunit, a different gene encodes the ? subunit

   3. Four genes are involved encoding both αβ and ϒδ receptors

   4. One gene encodes the ϒ subunit, a different gene encodes the δ subunit

   5. Humans average six different TCR got greater diversity in adaptive immunity

3. Ig gene transcription regulation; key features include:

   3. A strong promoter and locus control region

   4. A weak promoter and locus control region

   5. A promoter for each V segment and an enhancer

   6. Key features are not well known

4. Recombination signal sequences (RSSs) are thought to have evolved through:

   4. Random mutation

   5. Gene transfer from the mitochondrial genome

   6. RNA splicing

   7. The activity of a transposon

Answer 1

1.answer :e

All of the above are correct.

Despite use of complement-binding proteins , their mechanisms of action contains a few successful strategies: the recruitment or mimicking of complement regulators; the modulation or inhibition of complement proteins by direct interactions; and inactivation by enzymatic degradation. In addition to these strategies, many microorganisms also possess passive evasive features-a prominent example is the cell wall of Gram-positive bacteria, which prevents lysis by the membrane attack complex/MAC.

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