Ch 47 Hw Quiz - MCQGeeks.com

Part DWhich of the following stages of development is defined by the three embryonic tissue layers (ectoderm, mesoderm, and endoderm)?

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gastrula
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morula
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blastula
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neural tube

Part A - Understanding the experimental designHow were the researchers able to independently measure DNA synthesis and RNA synthesis?

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Cleavage: blastula, cytoplasm partitioned into many cells, (yellow ball of cells)Gastrulation: embryonic germ layers form, gastrula, blastopore, (ball of cells with three layers yellow, red and blue)organogenesis: organs begin to develop from germ layers, neural tube, somites
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Thymidine is a nucleoside building block for DNA, but not RNA, whereas uridine is a nucleoside building block for RNA, but not DNA.
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The rate of DNA synthesis decreases, and RNA synthesis begins.
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The rates of DNA synthesis are the same with and without the toxin, so the likely explanation is that the DNA is labeled more extensively due to a greater uptake of the labeled thymidine.

Part DSeveral hours after fertilization, cleavage results in the formation of a hollow ball of cells called a _____.

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blastopore
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morula
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gastrula
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blastula

Part FThe _____ eventually develops into the sea urchin's digestive tract.

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spinal cord
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backbone
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neural tube
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archenteron

Part FThe enlarged anterior portion of the neural tube will develop into a frog's _____.

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backbone
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morula
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brain
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archenteron

Part AThe first stage of embryonic development is _. This process produces _.

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archenteron
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Ectoderm, mesoderm, endoderm
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cleavage ... a cluster of cells
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spinal cord

Part B - Gastrulation in a frog embryoGastrulation is the stage of embryonic development following cleavage. During gastrulation, cell division slows dramatically, and cells are rearranged in a precise way, forming three germ layers. The diagram below illustrates gastrulation in a frog embryo, represented in cross section.Drag the labels to their appropriate locations on the diagram. Use only pink labels for pink targets. Not all labels will be used.

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The rate of DNA synthesis decreases, and RNA synthesis begins.
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a. blastocoelb. primitive gut (archenteron)c. ectodermd. mesoderme. endodermf. blastoporeg. yolk plugh. blastopore formsi. primitive gut begins to formj. three germ layers inplace
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Cleavage: blastula, cytoplasm partitioned into many cells, (yellow ball of cells)Gastrulation: embryonic germ layers form, gastrula, blastopore, (ball of cells with three layers yellow, red and blue)organogenesis: organs begin to develop from germ layers, neural tube, somites
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The end of cleavage depends on the nucleus-to-cytoplasm ratio.

Part GThe posterior portion of the neural tube will develop into the frog's _____.

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archenteron
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spinal cord
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neural tube
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backbone

Part ADuring gastrulation in frogs, a rod of mesoderm under the dorsal surface forms the _____.

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ectoderm
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spinal cord
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notochord
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Mitosis

Part CAs cleavage continues, a zygote forms into a solid multicellular ball called a(n) _____.

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morula
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Mitosis
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blastula
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gastrula

Part FA child is born without a fully developed pancreas. He is normal in all other respects, and thus doctors believe that the problem most likely began early in development. During which of the following processes did the original error most likely occur?

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Ectoderm, mesoderm, endoderm
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neural plate
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Endoderm formation
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ectoderm

Part CWhich of the following are the three germ layers contained in the gastrula?

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gastrula
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Ectoderm, mesoderm, endoderm
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ectoderm
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It undergoes a change toward a more specialized form or function.

Part AEmbryonic cells especially active in assuring nutritional exchange between a pregnant woman and her embryo are found in the _____.

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gastrula
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neural tube
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notochord
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trophoblast

Part BDuring gastrulation in frogs, cells from the animal pole spread over the embryo and form the _____.

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ectoderm
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backbone
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blastopore
0%
Mitosis

Part EThe three-layered embryo is the _____.

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backbone
0%
blastula
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gastrula
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Blastomeres

Part AIn sea urchins, the process of fertilization produces a(n) _____.

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zygote
0%
morula
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backbone
0%
neural plate

Part AIn animal development, which of the following best describes the process of cleavage?

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ectoderm
0%
zygote
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Mitosis
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notochord

Part AAn embryonic cell that is "totipotent" is one that can _____.

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neural plate
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It undergoes a change toward a more specialized form or function.
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cleavage ... a cluster of cells
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by itself, give rise to the entire embryo, as cleavage proceeds

Part DTime point 5 corresponds to the 12th cell division, except in the presence of the toxin, which blocks cell division.Do the data support the hypothesis that the timing of the end of cleavage depends on counting cell divisions?

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The rate of DNA synthesis decreases, and RNA synthesis begins.
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No, because the toxin's blockage of cell division does not affect the timing of the end of cleavage.
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The end of cleavage depends on the nucleus-to-cytoplasm ratio.
0%
The rates of DNA synthesis are the same with and without the toxin, so the likely explanation is that the DNA is labeled more extensively due to a greater uptake of the labeled thymidine.

Part CThe researchers hypothesized that the toxin increases diffusion of thymidine into the embryos. What was their reasoning?

0%
The rate of DNA synthesis decreases, and RNA synthesis begins.
0%
The rates of DNA synthesis are the same with and without the toxin, so the likely explanation is that the DNA is labeled more extensively due to a greater uptake of the labeled thymidine.
0%
Thymidine is a nucleoside building block for DNA, but not RNA, whereas uridine is a nucleoside building block for RNA, but not DNA.
0%
neural tube

Part AThe mesoderm gives rise to _____.

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gastrula
0%
cleavage ... a cluster of cells
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skeletal and muscular systems
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spinal cord

Part GDuring gastrulation, invagination occurs at the _____.

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Blastomeres
0%
blastopore
0%
backbone
0%
notochord

Part HIn vertebrates, the ectoderm gives rise to the _____.

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blastopore
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zygote
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neural plate
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outer layer of skin

Part C - Organogenesis in a frog embryoTissue and organ formation begins during the process of organogenesis.Which five of the following statements are true about organogenesis in a frog embryo?

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Cleavage: blastula, cytoplasm partitioned into many cells, (yellow ball of cells)Gastrulation: embryonic germ layers form, gastrula, blastopore, (ball of cells with three layers yellow, red and blue)organogenesis: organs begin to develop from germ layers, neural tube, somites
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The endoderm gives rise to the lining of the frog's digestive tract.The neural tube forms from ectoderm and develops into the central nervous system. The notochord does not persist in adult frogs. Somites form along the length of the notochord and neural tube. Some somite cells migrate to other locations in the developing embryo.
0%
The end of cleavage depends on the nucleus-to-cytoplasm ratio.
0%
Thymidine is a nucleoside building block for DNA, but not RNA, whereas uridine is a nucleoside building block for RNA, but not DNA.

Part BWhat are the cells created by cleavage called?

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archenteron
0%
gastrula
0%
blastopore
0%
Blastomeres

Part DWhich of the following stages of development is defined by the three embryonic tissue layers (ectoderm, mesoderm, and endoderm)?

Part A - Understanding the experimental designHow were the researchers able to independently measure DNA synthesis and RNA synthesis?

Part DSeveral hours after fertilization, cleavage results in the formation of a hollow ball of cells called a _____.

Part FThe _____ eventually develops into the sea urchin's digestive tract.

Part FThe enlarged anterior portion of the neural tube will develop into a frog's _____.

Part AThe first stage of embryonic development is _____. This process produces _____.

Part GThe posterior portion of the neural tube will develop into the frog's _____.

Part ADuring gastrulation in frogs, a rod of mesoderm under the dorsal surface forms the _____.

Part CAs cleavage continues, a zygote forms into a solid multicellular ball called a(n) _____.

Part FA child is born without a fully developed pancreas. He is normal in all other respects, and thus doctors believe that the problem most likely began early in development. During which of the following processes did the original error most likely occur?

Part CWhich of the following are the three germ layers contained in the gastrula?

Part AEmbryonic cells especially active in assuring nutritional exchange between a pregnant woman and her embryo are found in the _____.

Part BDuring gastrulation in frogs, cells from the animal pole spread over the embryo and form the _____.

Part EThe three-layered embryo is the _____.

Part AIn sea urchins, the process of fertilization produces a(n) _____.

Part AIn animal development, which of the following best describes the process of cleavage?

Part AAn embryonic cell that is "totipotent" is one that can _____.

Part DTime point 5 corresponds to the 12th cell division, except in the presence of the toxin, which blocks cell division.Do the data support the hypothesis that the timing of the end of cleavage depends on counting cell divisions?

Part CThe researchers hypothesized that the toxin increases diffusion of thymidine into the embryos. What was their reasoning?

Part AThe mesoderm gives rise to _____.

Part GDuring gastrulation, invagination occurs at the _____.

Part HIn vertebrates, the ectoderm gives rise to the _____.

Part C - Organogenesis in a frog embryoTissue and organ formation begins during the process of organogenesis.Which five of the following statements are true about organogenesis in a frog embryo?

Part BWhat are the cells created by cleavage called?

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Part AThe first stage of embryonic development is _. This process produces _.