What is the root of an evolutionary tree?
A. the tips or ends of the branches that represent the groups being studied
B. the node at the base of the tree representing a common ancestor
C. a branch point representing an extinct ancestral species common to the two connected branches
D. another term for a bifurcating tree
E. refers to the length of each branch of the tree
B
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Some of the functions of the eukaryotic organelles are performed in bacteria by the:
A. plasma membrane. B. capsule. C. cell wall. D. nucleoid area. E. flagella/cilia.
Which of the four muscular chambers of the human heart directly propels blood into the pulmonary circulation?
A) right atrium B) right ventricle C) left atrium D) left ventricle
A person with neither anti-A nor anti-B antibodies in circulation has which of blood type?
A) A B) B C) AB D) O
Which is not usually true of archaea?
A. They are found as rods, spheres, or spirals. B. They reproduce by binary fission. C. They contain rigid cell walls. D. They are found as single cells. E. They contain peptidoglycan as part of their cell walls.