Biology
5th Edition
ISBN: 9781260487947
Author: BROOKER
Publisher: MCG
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Chapter 33, Problem 8TY
Naturally occurring identical twins are possible only in animals that
- a. have spiral cleavage.
- b. have determinate cleavage.
- c. are protostomes.
- d. have indeterminate cleavage.
- e. have spiral and determinate cleavage and are protosomes.
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In organisms such as the chick, in which the egg has extensive yolk, the eggA. shows complete cleavage.B. shows incomplete cleavage.C. forms a blastoderm but no blastocoel.D. shows even distribution of the yolk.E. fails to synthesize DNA during cleavage.
Which of the following is not true about frogs eggs and blastula formation? Choose all possible answers
a. denser yolk in the animal hemisphere.
b. Cleavage is holoblastic
c. first cleavage plane is meridional and bisects the gray crescent, revealing the existence of some factor(s) that determine(s) the initial orientation of the cleavage spindle.
d. first furrow also marks the plane of bilateral symmetry in the body
e. All four blastomeres differ in sizes.
f. All of the following are true about eggs of frogs.
If cells from the presumptive neural ectoderm of a frog gastrula are transplanted onto the surface of a second gastrula where skin would normally develop, the transplanted cells will still develop into tissues of the nervous system. This experiment shows that the transplanted cells areA. differentiated.B. totipotent.C. discontinuous.D. determined.E. endodermal.
Chapter 33 Solutions
Biology
Ch. 33.2 - Core Skill: Connections Look back to Figure 25.8....Ch. 33.2 - Prob. 2CSCh. 33.3 - Prob. 1CSCh. 33.3 - Prob. 1EQCh. 33.3 - Prob. 2EQCh. 33.3 - Prob. 3EQCh. 33 - Prob. 1TYCh. 33 - Prob. 2TYCh. 33 - Prob. 3TYCh. 33 - In triploblastic animals, the inner lining of the...
Ch. 33 - Prob. 5TYCh. 33 - Prob. 6TYCh. 33 - Prob. 7TYCh. 33 - Naturally occurring identical twins are possible...Ch. 33 - Prob. 9TYCh. 33 - A major finding of recent molecular studies is...Ch. 33 - Fierce debate centers on whether ctenophores or...Ch. 33 - Why was the evolution of a coelom important?Ch. 33 - Prob. 3CQCh. 33 - Discuss the many ways that animals can affect...Ch. 33 - Prob. 2COQ
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- All 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_forwardWhich of the following is not true about starfish eggs? Choose all possible answers a. eggs are fertilized prior to completion of the first meiotic divisions. b. eggs are generally less yolky and therefore cleave meroblastically. c. first two cleavage planes are meridional d. Each quartet (blastomeres) occupies a plane lying perpendicular to the animal-vegetal axis. e. All are true about the starfish eggs.arrow_forwardWhich of the following is not true about avian eggs? Choose all possible answers. a. exhibit holoblastic cleavage b. first cleavages are perpendicular to the plane of the blastodisc, and approximately at right angles to one another c. at the time of the fourth cleavage, a furrow running parallel to the circumference of the blastodisc separates central from peripheral forming blastomeres. d. portion of the undersurface of the blastoderm that is farthest from the source of gravity becomes the anterior end of the embryo. e. All of the following are true about eggs of frogs.arrow_forward
- Protostomes and deuterostomes can be classified based ona. cleavage pattern.b. destiny of the blastopore.c. whether the fate of the embryonic cells is fixed early duringdevelopment.d. all of the above.arrow_forwardThe following diagram is of the blastopore stage of embryonic development. Based on the information in the diagram, which of the following statements is correct a. Most animals exhibit this pattern of development. b. It would have formed by spiralian cleavage. c. It would exhibit determinate development. d. All of the choices are correct.arrow_forwardWhich of the following is NOT an example of cell migration as a part of cell differentiation? A. Mesenchyme cells forming mesoderm during gastrulation B. Primitive streak formation in a chick embryo C. Concentration of protein complexes during cleavage D. Convergent extension to elongate the archenteron in the sea urchinarrow_forward
- Gastrulation... A. Is a specialized form of cell division that partitions the cytoplasm of a fertilized egg B. Refers to the fusion of haploid gametes to give a diploid zygote C. Produces an embryo with either two or three distinct cell layers D. Is a developmental stage consisting of a cell layer surrounding a fluid-filled space E. None of the abovearrow_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_forwardThe zona pellucida is important in mammals because it... a. induces polyspermy. b. induces compaction. c. inhibits implantation of the embryo until the embryo reaches the uterus. d. inhibits the formation of twins.arrow_forward
- The cells that give rise to gametesa. are derived from the mesoderm.b. often arise independently from the three germ layers.c. originate directly from the tissue that will develop into thegonads.d. are some of the last cells of the embryo to differentiate.e. are formed the same way in all animals.arrow_forwardIn animal sexual reproduction the gametes are formed by the process of a. meiosis. b. mitosis. c. fusion. d. binary fission.arrow_forward(Please help me with all of these, I need a short explanation as to why it is the answer for each question)... 1. The evolution/development of the skeletal system found in the Deuterostomes, is made up of two molecules, Ca+2PO4-2 and collagen These molecules are produced released from by a specialized type of stem cell. Therefore, one would expect that these stem cells perform which of the following a) the storage and the release of Ca+2PO4-2 and collagen from vesicles from the Golgi apparatus, b) high levels of protein synthesis c) active transport of amino acids and ions into the stem cells through active transport, d) oxidation of pyruvate by the mitochondria, e) all are correct. 2. A multicellular eukaryote cell typically has enough available ATP to meet its needs for about 90 seconds. What would cause an active cell to exhaust its ATP supply so quickly? A) regular rest is a cellular requirement. B) Photosynthesis used up all ATP. C) ATP is transported into other cells. D)…arrow_forward
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