If the figure above is an accurate depiction of relatedness, then which of the following should be correct?
1. The entire tree is based on maximum parsimony.
2. If all species depicted here make up a taxon, this taxon is monophyletic.
3. The last common ancestor of species B and C occurred more recently than the last common ancestor of species D and E.
4. Species A is the direct ancestor of both species B and species C.
5. The species present at position 3 is ancestral to C, D, and E.
A) 1 and 3
B) 3 and 4
C) 2, 3, and 4
D) 1, 2, and 3
D
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Gastrulation is an important event in early embryonic development. Which of the following is NOT a result of gastrulation?
A) formation of three embryonic cell layers B) movement and alignment of many embryonic cells C) the formation of a gastrula D) the formation of specialized adult tissues
Which of the following stimuli will NOT activate a nociceptor?
A. extremes in temperature B. very intense mechanical stimulation C. specific chemicals in the extracellular fluid D. chemicals released by injured cells E. external odorant molecules
The process of converting nitrogen gas to ammonium is called
A) biogeochemical processing. B) sublimation. C) nitrogen fixation. D) evaporation. E) nitrification.
A glucose molecule is to starch as _____.
A. a steroid is to a lipid B. a protein is to an amino acid C. a nucleic acid is to a polypeptide D. a nucleotide is to a nucleic acid E. an amino acid is to a nucleic acid