The nodes of a phylogenetic tree represent

a. the extinct ancestor of extant species.
b. the point in time which two species diverged.
c. the evolution of a new phenotype.
d. a horizontal gene transfer event.


Answer: A

Biology & Microbiology

You might also like to view...

What is the counterstain used in acid fast staining?

What will be an ideal response?

Biology & Microbiology

Streptococcus pneumoniae can escape phagocytic clearance by which mechanism?

A. Capsule-mediated inhibition of phagocytosis B. Inhibition of phagolysosome fusion C. inhibition of opsonization mediated by protein A D. Lysis of phagosome and replication in cytoplasm E. Replication in fused phagolysosome

Biology & Microbiology

Gnetophytes are of great interest to plant biologists because they have many traits more typical of angiosperms, such as:

A. living xylem cells. B. wind pollination. C. double fertilization. D. few, slow-growing leaves. E. cones.

Biology & Microbiology

"Clonal selection" and "clonal expansion"

A. implies that each individual lymphocyte produces a single antibody. B. describes how a single lymphocyte proliferates in a population of effector cells. C. depends on an antibody recognizing a specific epitope. D. explain how an antigen stimulates the production of matching antibodies. E. All of the above

Biology & Microbiology