Biology: Science For Life With Physiology Plus Mastering Biology With Pearson Etext -- Access Card Package (6th Edition) (what's New In Biology)
6th Edition
ISBN: 9780134794679
Author: BELK
Publisher: PEARSON
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Chapter 23, Problem 6LTB
Summary Introduction
Introduction:
The early embryo differentiates into a structure called the gastrula, which is composed of three-layers, i.e. ectoderm, mesoderm, and endoderm. The process of differentiating into the three-layered structure is called gastrulation.
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Component of bilaminar germ disc:
a.Hypoblast and endoderm
b.Epiblast and hypoblast
c.Epiblast and ectodermÂ
d.Ectoderm and mesoderm
Which of the following is not derived from the ectoderm? a. adrenal medulla b. epidermis of skin c. liver d. nervous system
What part of the blastocyst develops into the embryo?a. Yolk sacb. Placentac. Polar bodyd. Inner cell mass
Chapter 23 Solutions
Biology: Science For Life With Physiology Plus Mastering Biology With Pearson Etext -- Access Card Package (6th Edition) (what's New In Biology)
Ch. 23 - Why can two cells with the same DNA have different...Ch. 23 - Prob. 2LTBCh. 23 - Add labels to the figure that follows, which...Ch. 23 - Prob. 4LTBCh. 23 - Prob. 5LTBCh. 23 - Prob. 6LTBCh. 23 - Which hormone helps prepare the uterus for...Ch. 23 - Prob. 8LTBCh. 23 - Prob. 9LTBCh. 23 - Prob. 10LTB
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- Which of the following consists of both fetal and maternal tissues? (a) umbilical cord (b) placenta (c) amnion (d) allantois (e) yolk sacarrow_forwardDefine and describe the main features of the following developmental stages: fertilization, cleavage, gastrulation.arrow_forwardA Survey of Human Development from Fertilization to Birth 4. The gestation of a fetus occurs over 9 months and is divided into three trimesters. Describe the major events that occur in each trimester. Is there a point at which the fetus becomes more human?arrow_forward
- Figure 29.22 Which of the following statements about the parts of an amniotic egg are false? The allantois stores nitrogenous waste and facilitates respiration. The chorion facilitates gas exchange. The yolk provides food for the growing embryo. The amniotic cavity is filled with albumen.arrow_forwardWhich of the following gives rise to the skin cells? a. ectoderm b. endoderm c. mesoderm d. none of the abovearrow_forwardPut these human developmental events in order, from earliest to latest a. blastocyst forms d. implantation b. heart begins beating e. breathing practice begins c. gastrulation f. neural tube formsarrow_forward
- During cleavage, the _______ is converted to a ball of cells, which in turn is transformed into the __________. a. zygote; blastocyst b. trophoblast; embryonic disk c. ovum; embryonic disk d. blastocyst; embryonic diskarrow_forwardMatch each developmental stage with its description.arrow_forwardWhich female organ has an endometrial lining that will support a developing baby? a. labia minora b. breast c. ovaries d. uterusarrow_forward
- The olfactory pits form from which of the following? mesoderm cartilage ectoderm endodermarrow_forwardWhich of the following are mismatched? (a) endoderm; lining of the digestive tube (b) ectoderm; circulatory system (c) mesoderm; notochord (d) mesoderm; reproductive system (e) ectoderm; sense organsarrow_forwardwhich germ layer (tissue) gives rice to our nervous system and outer coverings. a) endotherm b) ectoderm c) mesoderm d) endodermarrow_forward
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