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 most successful in terms of the percent of its derived species that are extant?

TLS Online TPP Program

#Question id: 23626

#Unit 13. Methods in Biology

To be useful as a vector, restriction enzyme reaction sites should be placed

TLS Online TPP Program

#Question id: 23627

#Unit 13. Methods in Biology

The human genome contains about ________ bp of DNA.

TLS Online TPP Program

#Question id: 23628

#Unit 13. Methods in Biology

Which of the following is true concerning genomic libraries?

TLS Online TPP Program

#Question id: 23629

#Unit 13. Methods in Biology

Mechanical shearing is often the preferred method of fragmenting genomic DNA when constructing a genomic DNA library. Why would this method be preferred over complete digestion with restriction enzymes?

TLS Online TPP Program

#Question id: 23630

#Unit 13. Methods in Biology

The construction of a cDNA library is completed by

TLS Online TPP Program

#Question id: 23631

#Unit 13. Methods in Biology

cDNA libraries from liver cells are different than cDNA libraries from kidney cells because