21. In cladistics,is(are) the primary criterion used to classily organisms a. ec

Question

21. In cladistics,is(are) the primary criterion used to classily organisms a. ecological niche b. common ancestry c. mating behavior d. observable traits e. All of the above 22. Phylogenetic trees with proportional branch lengths a. indicate relatedness among organisms and evolutionary time. b. indicate the relative number of nucleotide pair differences between groups c. are constructed by comparing DNA sequences of homologous genes and calibrating this molecular clock with the fossil record. d. All of the above are true. 23. Single celled eukaryotic cells belong to which of the following kingdoms? a. Protista b. Fungi c. Animalia d. plantae 24. Which kingdom is correctly described? a. Plantae: multicellular and photoautotrophic b. Fungi: Multicellular and heterotrophic c. Animalia: multicellular and heterotrophic by absorption d. Protista: unicellular and heterotrophic ony 25. The famous Greek philosopher Aristotle could be thought of as a taxonomist since he identified and grouped organisms. a. True b. false 26. If you were using cladistics to construct a phylogenetic tree of birds, what is the best outgroup? a. eagles b. robins c. bats d. eastern bluebirds 27. The innermost portion of a virus' structure is made up of A. a membranous envelope. B. either DNA or RNA. C. both DNA and RNA. D. a protein capsid. E. spikes.

Explanation / Answer

21. b - common ancestory.

22. d - All of the above are true.

23.a - Protista

24.a - Plantae: Multicellular and photoautotrophic.

25. a - True

26.c - bats

27. B- either DNA or RNA

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