Activation of which of the following is associated with the formation of focal adhesions and stress fibers?

A) Cdc42
B) plectin
C) Rho
D) Rac
E) ?-tubulin


Answer: C

Biology & Microbiology

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Over time, the relationship between a pathogen and a naà¯ve susceptible population tends towards

A) the extinction of the host. B) the extinction of the pathogen. C) a balance between host and pathogen such that both are maintained. D) the extinction of either the host or the pathogen.

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The failure of a pair of chromosome to separate during anaphase is referred to as:

A. inversion. B. translocation. C. trisomy. D. nondisjunction. E. disjunction.

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Which of the following statements is true?

A. Tracheids are multicellular conduits, whereas vessels are unicellular conduits. B. Tracheids transport water, whereas vessels transport sugars. C. Tracheids are short and thin, whereas vessel elements are much wider. D. Tracheids compose the xylem, and vessel elements compose the phloem. E. Water enters tracheids through pits, whereas water enters vessels only through spaces between the cells.

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Alleles at different loci can interact in a non-additive fashion in some behavioral traits. Indicate whether the statement is true or false

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