A good transition-state analog:

TLS Online TPP Program

#Question id: 8957

#Unit 9. Evolution & Diversity of Life Forms

A student encounters an animal embryo at the eight-cell stage. The four smaller cells that comprise one hemisphere of the embryo seem to be rotated 45 degrees and lie in the grooves between larger, underlying cells (spiral cleavage). This embryo may potentially develop into a(n)

TLS Online TPP Program

#Question id: 8958

#Unit 9. Evolution & Diversity of Life Forms

A student encounters an animal embryo at the eight-cell stage. The four smaller cells that comprise one hemisphere of the embryo seem to be rotated 45 degrees and lie in the grooves between larger, underlying cells (spiral cleavage). If we were to separate these eight cells and attempt to culture them individually, then what is most

likely to happen?

TLS Online TPP Program

#Question id: 8959

#Unit 9. Evolution & Diversity of Life Forms

The most ancient branch point in animal phylogeny is that between having

TLS Online TPP Program

#Question id: 8960

#Unit 9. Evolution & Diversity of Life Forms

With the current molecular-based phylogeny in mind, rank the following from most inclusive to least inclusive.

1. ecdysozoan

2. protostome

3. eumetazoan

4. triploblastic

TLS Online TPP Program

#Question id: 8961

#Unit 9. Evolution & Diversity of Life Forms

What does recent evidence from molecular systematics reveal about the relationship between grades and clades?

TLS Online TPP Program

#Question id: 8962

#Unit 9. Evolution & Diversity of Life Forms

What is characteristic of all ecdysozoans?