During which stage of development does implantation occur, followed by initial development of the nervous system, limb buds and all other systems?
a. critical period
b. sensitive period
c. embryonic period
d. fetal period
Answer: c. embryonic period
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In humans, the locus of the human growth
hormone gene is on chromosome:a. 15. b. 17. c. 19. d. 20. e. X.
What explanation can you give for why the sodium-potassium pump does not run out of ions to move in or out of the cell?
A. The cell continuously produces more ions to replace those moved by the pump, maintaining a constant supply. B. Leak channels are always open, allowing the passage of sodium ions (Na+) and potassium ions (K+) across the membrane. C. Many of the ions moved in or out then diffuse passively back through the membrane in the opposite direction.
Parabronchi are characteristic of:
a. insects. b. spiders. c. mollusks. d. birds. e. mammals.
Which stage of development immediately precedes the formation of specialized tissue and organs?
A. Gamete formation B. Cleavage C. Gastrulation D. Blastulation E. Binary fission