A profile can be generated from a multiple sequence alignment by obtaining position specific preference (or probability) of each amino acid. This can be used to identify homologs. However, the key difference between a profile alignment like this and Hidden Markov Model (HMM) is:

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#Question id: 8922

#Unit 9. Evolution & Diversity of Life Forms

Which statement is most consistent with the hypothesis that the Cambrian explosion was caused by the rise of predator-prey relationships?

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#Question id: 8923

#Unit 9. Evolution & Diversity of Life Forms

Which of these genetic processes may be most helpful in accounting for the Cambrian explosion?

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#Question id: 8924

#Unit 9. Evolution & Diversity of Life Forms

Fossil evidence indicates that the following events occurred in what sequence, from earliest to most recent?

1. Protostomes invade terrestrial environments.

2. Cambrian explosion occurs.

3. Deuterostomes invade terrestrial environments.

4. Vertebrates become top predators in the seas.

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#Question id: 8925

#Unit 9. Evolution & Diversity of Life Forms

What is the probable sequence in which the following clades of animals originated, from earliest to most recent?

1. tetrapods

2. vertebrates

3. deuterostomes

4. amniotes

5. bilaterians

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#Question id: 8926

#Unit 9. Evolution & Diversity of Life Forms

Sponges and cnidarians are among the fossilized animals found in both the Ediacara Hills and the Burgess Shale from the Rocky Mountains of British Colombia. This observation requires that

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#Question id: 8927

#Unit 9. Evolution & Diversity of Life Forms

Arthropods invaded land about 100 million years before vertebrates did so. This most clearly implies that