Bio 268-Third Exa 16. The cardiac mesoderm develops in a region of the 22. Hindl
ID: 273091 • Letter: B
Question
Bio 268-Third Exa 16. The cardiac mesoderm develops in a region of the 22. Hindlimbs differentiate and develop as legs (not that receivessignals. intermediate mesoderm; high levels of Wnt b. paraxial mesoderm; low levels of BMH wings) in the chick embryo because a. the posterior limb buds express Tbx4 b. the lateral plate mesoderm stops producing FGF e. anterior lateral plate mesoderm; high levels of BMP the intermediate mesoderm stops producing Wntk and low levels of Wnt d. posterior lateral plate mesoderm; high levels of d the anterior limb buds express sonic hedgehog e. all of the above factors are necessary to start the organizer e. posterior lateral plate mesoderm; high levels of Wnt development of a hindlimb 23. If a gel bead that contains is implanted in the 17. The first heart field forms the heart tube and becomes trunk of a chick embryo, it can induce a limb bud that a. the left ventricle b. the aorta c. the pulmonary arteries d. the right atrium e. the vena cava will develop into a complete extra limb a. Shh b. Fgfl0 d. BMP e. Notch 18. Which of the following develops from the lateral plate 24. The mesoderm of the progress zone (PZ) of the early mesodern? a. skeleton of the face b. thymus gland c. limb muscle d. ribs e blood vessels limb bud secretes, inducing the apical ectodermal ridge (AER), which in turn secretes a. nodal; chordin b. Wnt: BMP d. collagen; fibronectin e. estrogens; androgens 19. The limb bud contains cells from a. the trunk ectoderm. b. the lateral plate mesoderm. c. the somites d. All of the above cells are found in the limb bud e. None of the above 25, Which of the following limb bud structures produces posterior signals? a. Zone of polarizing activity (ZPA) b. Dorsal ectoderm. c. Apical ectodermal ridge (AER). d. Progress zone (PZ). e. Thumb. 20. Which of the following statements about the embryonic limb field is true? a. A limb field transplanted into the head of a host embryo will form an eye b. Individual cells of the early limb field have 26. Which of the following actions would completely stop autonomous specification and can only form either stylopod, zeugopod, or autopod structures. the development of a wing bud? a. Removing the carly apical ectodermal ridge(AER) b. Replacing the wing AER with a leg AER e. Transplanting an extra zone of polarizing activity e. The limb field is determined; a transplanted limb field still Removal of a small piece of the limb field results in the development of a limb with missing parts. Cells of the limb field migrate into the spinal cord. forms a limb. (ZPA) to the anterior side of an early wing bud d. Replacing the late wing progress zone (PZ) with an early wing PZ e. Replacing the wing PZ with a leg PZ A knockout mouse that is Horal I HordI will show 27, Which of the following limb bud signals determine expressed in the limb. a. no limb defects, because Hox genes are not b. no paws c. a mirror image duplication of the digits d. a missing or defective zeugopod (no radius/ulna) e. footpads on both sides of the paws the dorsal-ventral axis of the limb? a. Shh from the zone of polarizing activity (ZPA) b. Fgfs from the apical ectodermal ridge (AER) c. Nerve signals from the thumb. d. Wnt7a from the dorsal ectoderm of the limb bud. e. Fgf10 from the progress zone (PZ) Page 2 of 3Explanation / Answer
Q19.THE LATERAL BUDS CONTAIN CELLS FROM?
ANSWER: the lim buds contsain cells from b) the lateral plate mesoderm
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