Traditional animal phylogenetic trees and the most recent molecular phylogenetic trees have many similarities. Which is a feature of the recent trees that was not present in the traditional phylogeny?
A) the placement of Echinodermata and Chordata together in a clade of deuterostomes
B) the status of sponges as the first group to diverge from the other animals
C) the grouping of nematodes and arthropods into a clade called the Ecdysozoa
D) the grouping of all bilaterally symmetric animals within a single clade
Answer: C
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Which of the following describes the most likely order of events in allopatric speciation?
A) genetic drift, genetic isolation, divergence B) genetic isolation, divergence, genetic drift C) divergence, genetic drift, genetic isolation D) divergence, genetic isolation, genetic drift E) genetic isolation, genetic drift, divergence
Information obtained by Franklin from X-ray crystallography on DNA suggested that it is shaped like a
A. helix. B. ribbon. C. hollow cylinder. D. pleated sheet. E. icosahedron.
Where does the Calvin cycle occur?
A. chloroplast inner membrane B. thylakoid membrane C. thylakoid lumen D. chloroplast stroma E. chloroplast outer membrane
For given species, the maximum rate of increase per individual under ideal conditions is its _____
a. biotic potential c. environmental resistance b. carrying capacity d. density control