The treeʹs horizontal axis is a timeline that extends from 100,000 years ago to the present; the vertical axis represents nothing in particular. The labeled branch points on the tree (V—Z) represent various common ancestors. Letʹs say that only since 50,000 years ago has there been enough variation between the lineages depicted here to separate them into distinct species, and only the tips of the lineages on this tree represent distinct species.

How many separate species, both extant and extinct, are depicted in this tree?

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#Question id: 19735

#Unit 3. Fundamental Processes

In mammals, six telomeric proteins (TRF1, TRF2, Rap1, TIN2, TPP1, and POT1) comprises a complex which of the following is incorrect regrarding these telomeric protein

a) TRF1, TRF2, Rap1, binds to double stranded of DNA

b) TIN2 does not binds to DNA at all

c) POT1 binds to the GT tail extended by telomerase

d) TIN2 interacts with the two duplex telomeric DNA-binding proteins TRF1 and TRF2 as well as with TPP1

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#Question id: 24643

#Unit 10. Ecological Principles

 Which of the following statements about typical soil horizons is correct?

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#Question id: 23587

#Unit 13. Methods in Biology

Plasmids are usually introduced into bacterial cells by ________.

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#Question id: 28351

#Unit 5. Developmental Biology

Oskar mRNA becomes complexed with plus-directed motor protein in the oocyte, it moves to the growing end of the microtubules at the posterior region, where the translation occur but inhibition of Oskar translation is mediated by____

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#Question id: 11665

#Unit 7. System Physiology – Animal

Materials are returned to the blood from the filtrate by which of the following processes?