Which of the following is considered a mechanical vector transmission?
A) cockroach transmission of Shigella
B) mosquito transmission of Plasmodium
C) flea transmission of Yersinia
D) tsetse fly transmission of Trypanosoma
E) louse transmission of Rickettsia
A
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Which of the following statements does not represent the role of a cell marker in the third line of defense?
A. They serve as transcription factors to initiate antibody production. B. They receive and transmit signals to coordinate the immune response. C. They are attachment sites for foreign molecules. D. They serve as recognition factors for self and nonself molecules.
A protein synthesis inhibitor would block learning in a human, but would have no effect in a simple invertebrate like Aplysia.
Answer the following statement true (T) or false (F)
Genetic exchange between 2 homologous chromosomes is called
A. crossing over. B. pleiotropy. C. allelic exchange. D. independent assortment. E. synapsis.
Homologous pairs of chromosomes are lined up independently of other such pairs during _____.
a. metaphase I b. telophase II c. prophase II d. metaphase II e. anaphase I