Why might a phylogeny based only on molecular data show a different pattern of relationships than a phylogeny of the same taxa that is based only on morphological traits?
What will be an ideal response?
Depending on a function of a gene's product, there may be strong selective pressure against
changing gene sequence.
Gene sequence changes may not result in morphological changes.
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Which of the following provides the best explanation for why viruses are not included in the three domain system?
A. Viruses have either DNA or RNA, not both. B. Viruses show no evidence of evolution. C. Viruses are not a cellular life form. D. Viruses are too small.
The variable region of a light chain is indicated
by a. A. b. B. c. C. d. D. e. E.
Which of the following parts of a cell is (are) most like the shipping center of a company?
A) the Golgi apparatus B) mitochondria C) chloroplasts D) the nucleolus
Because they differ from other living organisms by lacking a discrete nucleus and many other cell inclusions, bacteria and archaea are more closely related to one another than they are to eukaryotes.
Answer the following statement true (T) or false (F)