The key molecule upon which all complement pathways converge is
A. C1.
B. C2.
C. C3.
D. C6.
C
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Vascular cambium is capable of producing:
A. primary xylem only. B. primary phloem only. C. secondary xylem only. D. secondary phloem only. E. secondary xylem and phloem.
Which algebraic expression would be used to denote a trisomic organism?
A. 3n B. 2n - 1 C. 2n + 1 D. 2n + 2
Which trait is the best example of an adaptation?
A) A mutation resulting in a heat-resistant enzyme in a bacterium living in a hot spring B) A mutation resulting in weak branches in a species of tree that lives in windy regions C) A new mutation that confers Tay-Sachs disease in humans D) A shorter neck in a giraffe that lives in an area with many rival males and tall trees E) A longer tongue in an insect-eating mammal that feeds on insects that live in shallow burrows
Answer the following questions true (T) or false (F)
1. Reproductive cloning has been used to clone humans. 2. Forensic DNA typing can prove the innocence of a crime suspect. 3. Before Darwin, most scientists believed that species of organisms were fixed and unchanging.