How does the protozoan Trypanosoma evade detection by the immune system?

A) It produces a capsule which is composed of polysaccharides similar to those found in the host.
B) It can change the surface antigens frequently, preventing the immune system from tracking it.
C) It prevents phagosome-lysosome fusion.
D) It can resist oxidation inside macrophages.


Ans: B) It can change the surface antigens frequently, preventing the immune system from tracking it.

Biology & Microbiology

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What may result when grafted tissue such as bone marrow contains passenger lymphocytes?

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Which group in Bacteria lacks cell walls?

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Answer the following statements true (T) or false (F)

1. Tagmata are segments of the body that represent two or more previous body segments fused together. 2. Scorpions do not lay eggs but rather give birth to live young. 3. Millipedes have a thousand legs whereas centipedes have only a hundred legs. 4. The diversification of flowering plants was responsible for the diversification of insects.

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____ occurs within a single plant, while ____ occurs between two plants

a. A dihybrid cross; a monohybrid cross b. Epistasis; polygenic inheritance c. A testcross; cross-pollination d. Self-pollination; cross-pollination e. A dihybrid cross; self-pollination

Biology & Microbiology