What dosage compensation mechanism is employed by female placental mammals?
A) synteny
B) Y-inactivation
C) X-inactivation
D) X nondisjunction
E) X chromosome crossing over
C
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Which of the following statements is true regarding subduction?
A. It adds new crust to Earth's surface via volcanic activity. B. It is unrelated to Earth's plate tectonics. C. It permanently removes carbon from Earth's surface. D. It permanently adds carbon to Earth's atmosphere. E. The carbon it removes is eventually returned to the atmosphere by volcanism.
What is the name of the specialized stinging cells that jellyfishes have as part of their epidermis, and which they use to paralyze small prey?
a. tentacles b. flame cells c. choanocytes d. cnidocytes
Protist is a diverse group of organisms that are similar in
A) rRNA sequences. B) Metabolic type. C) Motility. D) Ecology. E) None of the above.
Which of the following act as the brakes of the cell cycle and prevent cells from dividing too quickly?
a. oncogenes b. proto-oncogenes c. cyclins d. tumor suppressor genes