1 A) head B) tail C) midpiece 2 A) the blastocoel develops B) three layers of cells are present C) the egg nucleus fuses with the sperm nucleus D) the ectoderm and endoderm are present 3 A) ectoderm B) endoderm C) mesoderm 4 A) 3, 2, 1, 4 B) 2, 4, 3, 1 C) 2, 3, 1, 4 D) 3, 2, 4, 1 5 A) blastocoel B) coelom C) hemocoel D) archenteron 6 A) prostaglandins B) oxytocin C) androgens D) All of these 7 A) lungs B) liver C) kidneys D) heart 8 A) one B) two C) three D) four 9 A) notochord B) umbilical cord C) pharyngeal arches D) limb buds 10 A) second B) fifth C) twelfth D) twentieth 11 A) chorion B) allantois C) amnion D) yolk sac 12 A) estrogen B) inhibin C) follicle stimulating hormone D) human chorionic gonadotropin 13 A) oviduct B) uterus C) vagina 14 A) morphogens B) bicoid genes C) homeotic genes 15 A) are located on a single chromosome in humans and mice B) greatly vary from species to species C) are expressed from anterior to posterior in the same order in humans, mice and Drosophila D) All of these 16 A) the master ced protein is inactivated B) apoptosis occurs C) proteases and nucleases that slice up proteins and DNA in the cell are produced D) All of these 17 A) morphogenesis B) gastrulation C) induction D) differentiation 18 A) ectoderm B) mesoderm C) endoderm 19 A) Skeleton B) Cardiovascular system C) Dermis of the skin D) All of these 20 A) endoderm B) ectoderm C) mesoderm
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