Looking at the figure above, the 2 labelled roots represent which of the items listed below?
1. ancestral populations
2. the common ancestor of birds and crocodilians
3. the common ancestor to all tetrapods
4. the ancestral lineage from which all other lineages on the tree are derived
a. Both (1) and (2) but not (3) and (4)
b. Both (1) and (3) but not (2) and (4)
c. Both (3) and (4) but not (1) and (2)
d. (1), (2), (3), and (4)
D
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A very rudimentary “brain” found in flatworms consists of a collection of neurons that
integrate information called __________.
a. ganglia b. a spinal cord c. a nerve net d. interneurons
What is the advantage to an animal of having extracellular digestion within a gut cavity rather than intracellular digestion?
What will be an ideal response?
Mutations in the proto-oncogene ras and the tumor-suppressor gene p53
A) increase protein synthesis by the cell. B) can improve the chance of avoiding cancer as one ages. C) can enhance further mutations, which can develop into cancer. D) disrupt normal regulation of the cell cycle.
Which of the following groups of drugs can become incorporated into the bones and teeth of a fetus?
A) beta-lactams B) aminoglycosides C) quinolones D) tetracyclines E) sulfonamides