Which is not a factor that contributes to normal cells becoming cancerous?
A) the conversion of a proto-oncogene to an oncogene
B) mutations in a tumor-suppressor gene
C) the production of more effective tumor-suppressor gene products
D) excessive replication of proto-oncogenes
Answer: C
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During replication, which enzyme unwinds the DNA double helix?
A. DNA primase B. DNA polymerase I C. DNA helicase D. DNA gyrase E. DNA ligase
Echinoderms and chordates are
(a) deuterostomes. (b) protostomes. (c) animals whose blastopore becomes a mouth. (d) both b and c.
The movement of individuals into another population is termed
A. immigration. B. population dispersion. C. expatriation. D. clumping. E. emigration.
The attachment point of a muscle to a bone that can move is called the ________
A) origin B) insertion C) synergistic D) antagonistic