The key molecule upon which all complement pathways converge is

A. C1.
B. C2.
C. C3.
D. C6.


C

Biology & Microbiology

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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.

Biology & Microbiology

Which algebraic expression would be used to denote a trisomic organism?

A. 3n B. 2n - 1 C. 2n + 1 D. 2n + 2

Biology & Microbiology

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

Biology & Microbiology

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.

Biology & Microbiology