Long-branch attraction is:

a. inferring too close a relationship between rapidly evolving branches.
b. species on branches of a phylogenetic tree being ‘pulled together' by an inference procedure.
c. A and B.
d. Neither of the above.


C

Biology & Microbiology

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What role does Acidithiobacillus ferrooxidans play in the copper leaching process?

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When in the cell cycle would you find sister chromatids?

A. G1 B. S C. G2 D. Answers b and c are correct.

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X chromosome inactivation is caused by the accumulation of:

A. proteins produced by the Xist gene; these proteins induce methylation, histone modification, and other changes associated with preventing transcription. B. coding RNA produced by the Xist gene; this RNA, in addition to coding for Xist proteins, binds to and coats the X chromosome undergoing inactivation and physically prevents it from being transcribed. C. non-coding RNA produced by the Xist gene, which coats the X chromosome and physically prevents it from being unwound, "unzipped," and transcribed. D. non-coding RNA produced by the Xist gene, which coats the X chromosome and induces methylation, histone modification, and other changes associated with preventing transcription. E. None of these choices accurately describe the process of X chromosome inactivation.

Biology & Microbiology

Vectors can transfer ____

a. DNA sequences into bacterial host cells for cloning b. DNA sequences into viral host cells for cloning c. cloned viral cells into a bacterial host for cloning d. cloned mitochondria from donor cell to host cell e. cloned chromosomes from the nucleus of a cell into its cytoplasm

Biology & Microbiology