1. The femur bone develops from which of the following? A. somite mesoderm B. somatopleuric mesoderm C. intermediate mesoderm D. splanchnopleuric mesoderm E. sclerotome mesoderm 2. All of the following structures are necessary for blastocyst implantation EXCEPT A. en endometrum in pr progestational st stage B. zona pellucida C. syncytiotrophoblast D. cytotrophoblast 3. Between which two layers is the extraembryonic mesoderm located? A. Epiblast and hypoblast B. Syncytiotrophoblast and cytotrophoblast C. Syncytiotrophoblast and endometrium D. Exocoelomic (Heuser's) membrane & syncytiotrophobla E. Exocoelomic (Heuser's) membrane and cytotrophoblast 4. How soon after fertilization occurs within the uterine tube does the blastocyst begin implantation? A. Within minutes B. By 12 hours C. By day 1 D. By day 2 E. By day 7 5. The dorsal muscle mass in the lower limb forms what type of muscles? A. extensors and abductors B. extensors and supinators C. flexors and pronators D. flexors and adductors 6. The layers of the trilaminar germ disc are formed from the: A.. epiblast B. hypoblast C. epiblast and hypoblast D. embryoblast and hypoblast E. cytotrophoblast 7. A complete hydatidiform mole: A. results in a chordoma B. has a triploid karyotype C. produces a high level of hCG D. suggests paternal genome controls embryonic development E. A, B, and C 8. Which germ layers are present at the end of week 3 of development?
A. Epiblast only B. Epiblast and hypoblast C. Ectoderm and endoderm D. Ectoderm, mesoderm and endoderm E. Epiblast, mesoderm and hypoblast 9. Which process establishes the 3 definitive germ layers? A. Neuralation B. Gastrulation C. Craniocaudal folding D. Lateral folding E. Angiogenesis 10. Which of the following describes the number of chromosomes and amount of DNA in a gamete? A. 46 chromosomes, 1N B. 46 chromosomes, 2N C. 23 chromosomes, 1N D. 23 chromosomes, 2N E. 23 chromosomes, 4N 11. When does a primary oocyte complete its first meiotic division? A. at ovulation B. after the ovulatory surge of FSH and LH C. at fertilization D. at 5 months of fetal life E. before birth 12. Human Chorionic Gonadotropin (hCG): A. is produced by the syncytiotrophoblast B. enters the maternal blood circulation C. stimulates the production of progesterone D. A, B, and C 13. The chorionic membrane consists of: A. epiblast, cytotrophoblast, and syncytiotrophoblast B. hypoblast, cytotrophoblast, and syncytiotrophoblast C. extraembryonic mesoderm, cytotrophoblast, and syncytiotrophoblast D. Heuser’s membrane, extraembryonic mesoderm, and cytotrophoblast 14. Which statement best describes the development of the neural tube? A. it develops directly from the primitive streak B. it develops directly from the notochord C. it develops from the ectoderm immediately dorsal to the notochord D. it develops from the ectoderm immediately dorsal to the primitive streak E. none of the above. 15. When does formation of primary spermatocytes begin? A. week 4 of embryonic life B. month 5 of fetal life
C. birth D. month 5 of infancy E. puberty
1. B 2. B 3. E 4. E 5. A 6. A 7. C 8. D 9. B 10. C 11. B 12. D 13. C 14. C 15. E
