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.

Which of the five common ancestors, labeled V—Z, has been least successful in terms of the percent of its derived species that are extant?

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#Question id: 11374

#Unit 9. Diversity of Life Forms

Which of the following use light energy to generate ATP, but do not release oxygen?

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#Question id: 23662

#Unit 13. Methods in Biology

Under normal conditions, about what minimum range of sequence similarity is desired to obtain hybridization between a cDNA probe and the desired gene in a library?

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#Question id: 33408

#Unit 1. Molecules and their Interaction Relevant to Biology

Thermal denaturation curve of a protein denoted as

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#Question id: 28926

#Unit 4. Cell Communication and Cell Signaling

Cubitis interruptus is a___

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#Question id: 27159

#Unit 1. Molecules and their Interaction Relevant to Biology

This event can cause a damage to the hypothalamus portal system