M-phase is regulated by M-phase cyclin-dependent kinase (CDK) and cyclin B1
a. true
b. false
Ans: a. true
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Many microbial habitats are unsuitable for plants and animals
Indicate whether the statement is true or false.
Use the principle of parsimony and molecular genetic data to choose a phylogenetic tree for your hypothesis of how the extant species were derived from the ancestor.
A. Tree 1 requires the most mutations, making it the best choice.
B. Tree 1 requires the fewest mutations, making it the best choice.
C. Tree 2 requires the most mutations, making it the best choice.
D. Tree 2 requires the fewest mutations, making it the best choice.
E. Both trees are equally good because sequences A, B, C, and D are the same in both.
Clusters of cell bodies of neurons outside the central nervous system are known as
a. nerve cords. b. ganglia. c. a plexus. d. notochords. e. nerves.
A new virus is discovered that has double stranded DNA and no envelope. The highly purified virions form large crystals. This new virus is most likely a member of which virus family?
A) Adenoviridae B) Herpesviridae C) Papillomarviridae D) Poxviridae E) Papillomaviridae