Systematists use phylogenetic trees to graphically represent hypothesized evolutionary relationships among
organisms.
_____________________ Indicate whether the statement is true or false.
True
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You arrive late to a biological seminar. However, just as you enter the room, you hear the speaker referring to the "five-prime end" and the "three-prime end" of a macromolecule. Immediately, you know that they are talking about a:
A. carbohydrate. B. protein. C. DNA. D. lipid.
The basic unit of heredity is the ___________
A. individual B. gene C. macromolecule D. trait E. None of the answers are correct
Animal groups differ in the mechanisms by which heartbeats are initiated. Most arthropods have a
A. neurogenic heart while vertebrates have a myogenic heart. B. myogenic heart while vertebrates have a neurogenic heart. C. neurogenic heart while vertebrates have a cardiogenic heart. D. cardiogenic heart while vertebrates have a myogenic heart. E. autonomous heart while vertebrates have a neurally controlled heart.
What would happen if an embryo failed to secrete HCG?
A) The maternal elements of the placenta would fail to develop. B) The fetal elements of the placenta would fail to develop. C) Neural tube formation would not occur, and the embryo would not have a brain. D) The embryo would be aborted.