Biology
12th Edition
ISBN: 9780134813448
Author: Audesirk, Teresa, Gerald, Byers, Bruce E.
Publisher: Pearson,
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Chapter 43, Problem 5MC
Summary Introduction
Introduction: Gastrulation can be defined as the processes by which blastula (an embryo at an early stage of development) is differentiated into three-layered embryo, which is called gastrula. In this process, zygote differentiates into early cleavage stages forming morula, blastula, and gastrula stages in a definite sequence.
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Which of the following is false? a. The endoderm, mesoderm, ectoderm are germ layers. b. The trophoblast is a germ layer. c. The inner cell mass is a source of embryonic stem cells. d. The blastula is often a hollow ball of cells.
Which of the following structures develops into only the fetus?
a. Inner cell mass
b. Trophoblast
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The inner cell mass of a human blastocysta. gives rise to the chorion.b. gives rise to the placenta.c. gives rise to the embryo.d. consists of highly differentiated cells.
Chapter 43 Solutions
Biology
Ch. 43.1 - define development and describe how cell division...Ch. 43.2 - Prob. 1CYLCh. 43.3 - describe early development in amphibians,...Ch. 43.3 - Prob. 2CYLCh. 43.4 - Prob. 1TCCh. 43.4 - Prob. 2TCCh. 43.4 - Does the development of a human limb, and the rest...Ch. 43.4 - Prob. 1CYLCh. 43.4 - Prob. 2CYLCh. 43.5 - Prob. 1TC
Ch. 43.5 - Prob. 1CSCCh. 43.5 - Prob. 2TCCh. 43.5 - Prob. 3TCCh. 43.5 - Prob. 1HYEWCh. 43.5 - describe human embryonic development from...Ch. 43.5 - describe the structure and function of the...Ch. 43.5 - Prob. 3CYLCh. 43.6 - Prob. 1TCCh. 43.6 - Prob. 1CYLCh. 43.6 - Prob. 2CYLCh. 43.6 - Prob. 3CYLCh. 43.6 - Prob. 2TCCh. 43 - Prob. 1MCCh. 43 - Animals with Indirect development a. develop...Ch. 43 - Prob. 3MCCh. 43 - Prob. 4MCCh. 43 - Prob. 5MCCh. 43 - Prob. 6MCCh. 43 - Prob. 7MCCh. 43 - Prob. 8MCCh. 43 - Prob. 1FIBCh. 43 - Prob. 2FIBCh. 43 - Prob. 3FIBCh. 43 - Prob. 4FIBCh. 43 - Distinguish between direct and indirect...Ch. 43 - Describe the structure and function of the four...Ch. 43 - What is gastrulation? Describe gastrulation in...Ch. 43 - Prob. 4RQCh. 43 - Prob. 5RQCh. 43 - In humans, where does fertilization occur, and...Ch. 43 - Prob. 7RQCh. 43 - Prob. 8RQCh. 43 - How do changes in the breast prepare a mother to...Ch. 43 - Prob. 10RQCh. 43 - Prob. 1ACCh. 43 - Prob. 2AC
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- Which of the following statements is incorrect?a. The placenta secretes hormones such as progesterone, hCG, and estrogen.b. Embryonic tissue and maternal tissue forms the placenta.c. The chorion supplies nutrients to the embryo by diffusion.d. The umbilical cord is formed by one artery and two veinsarrow_forwardWhich of the following statements is false? a. Cadherins, but not integrins play a role in gastrulation. b. Gastrulation creates the primary germ layers c. Gastrulation requires cells to change their gene expression. d. Body axes are stabilized (made permanent) during gastrulation.arrow_forwardGiven these structures:(1) blastocyst (2) morula (3) zygoteChoose the arrangement that lists the structures in the order in whichthey form during development.a. 1,2,3 c. 2,3,1 e. 3,2,1b. 1,3,2 d. 3,1,2arrow_forward
- Observations of the developing chick embryo reveal that skeletal muscles develop from the transplanted somites even though motor neurons innervating those muscles arise from chick neural crest cells. Based on these observations, what is MOST likely true? A. Neural crest cells differentiate into somites. B. Neural crest cells fuse with developing somite cells. C. Neural crest cells develop from migrating somite cells. D. Neural crest cells send projections into developing somites.arrow_forwardA gastrulation does NOT Select one: A. Consist of endoderm, mesoderm, and ectoderm B. Result in the formation of a third layer in the embryonic disc C. Involve the formnation of germ layers D. Include the differentiation of cells into tissues and organsarrow_forwardOdontoblasts are derived from a. Ectoderm b. Endoderm c. Histiocytes d. Undifferentiated mesenchymal cellsarrow_forward
- Gastrulation does NOT Select one: a. involve the formation of germ layers b. consist of endoderm, mesoderm, and ectoderm c. result in the formation of a third layer in the embryonic disk d. include the differentiation of cells into tissues and organsarrow_forwardIn a reptile egg, the extraembryonic membrane thatencloses the embryo in a watery environment is thea. allantois.b. amnion.c. chorion.d. yolk sac.arrow_forwardAll of the following are true about humans EXCEPT: A. our zygote and early embryo cells have indeterminate cleavage B. Our blastopore becomes our mouth C. We are eumetazoan triploblastic bilateral deuterostomes D. our early embryo cells are sort of radially arranged but with rotational cleavagearrow_forward
- What are the correct pairings of developing and embryonic structures in the gastrulation of chickens? a. Epiblast- ectoderm c. Primary hypoblast-endoderm Read the following statements CAREFULLY: I. II. III. IV. b. Secondary hypoblast - endoderm d. Migrating cells - mesoderm The germ band needs to retract for fruit fly segments to develop properly. The formation of the sea urchin archenteron is made possible by epithelial cells that underwent epithelial-to-mesenchymal transition. Frog gastrulation involves the epiboly of endoderm cells. Chicken endoderm and mesoderm is formed through the migration of cells through both the anterior and posterior end of the primitive streak. a. All choices are true b. I & Il are true but IV is false d. IV is sometimes true c. Ill is falsearrow_forwardWhich of the following statements is NOT correct about the umbilical cord? a. The umbilical cord is formed from the yolk sac and the allantois. b. The umbilical cord is formed from the chorion. c. The umbilical cord consists of two arteries and one vein. d. The placenta connects to the embryon via the umbilical cord.arrow_forwardWhich of the following statements about gastrulation is correct? A. During gastrulation, the contents of cell nuclei begin to vary so that they can start to perform different fucntions. B. During gastrulation, cells differentiate so that they can start to perform different functions. C. The formation of the endoderm, mesoderm, and ectoderm occurs after gastrulation. D. The formation of the endoderm, mesoderm, and ectoderm occurs before gastrulation.arrow_forward
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Embryology | Fertilization, Cleavage, Blastulation; Author: Ninja Nerd;https://www.youtube.com/watch?v=8-KF0rnhKTU;License: Standard YouTube License, CC-BY