Name te your name on this test form and your name and the test Read the question
ID: 3166918 • Letter: N
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Name te your name on this test form and your name and the test Read the questions, think about what is going on and choose the BEST choice. number on the Scantron fo Turn in your test sheet and Scantron in the correct stack. Use critical thinking skills. Make drawings, when helpful. 12) Which is the correct, most complete order of development? means "develops into") A) zygotemorula placenta embryo B) zygotezygote morula blastocyst C) zygote blastocyst moula-) inner cell mass D) zygotemorula blastocyst embryo E) zygote trophoblast blastocyst embryo 13) Totipotent stem cells A) are found in the trophoblast. are only inner cell mass cells. B) C) only become mesoderm tissue. are found in adult tissues. D) E) can become only one cell type. 14) What is the correct arrangement of the following terms? A) Chromosomes contain thousands of genes on proteins. B) Proteins contain thousands of chromosomes on genes. C) Genes contain thousands of chromosomes on DNA. D) DNA contains thousands of genes on chromosomes. E DNA contains thousands of proteins on genes 15) Which of the following statements is true? A) Developmen B) Embryonic stem cells completely express all their genes. C) The outer blastocyst develops into skin. D) Blood contains totipotent stem cells. E) The left arm of an embryo is derived solely from mesoderm on the left-side of the inner cell mass. t results from the correct expression and timing of expression of genes. Match the following phases of the mitotic cell cycle to questions 16- 19 A) Prophase B) Metaphase C) Telophase E) Anaphase 16) When does DNA replication occur in the cell cycle? 17) When does the nuclear envelope disappear? 18) When does the spindle attach to the sister chromatids? 19) What is the first phase of the cell cycle when it contains 92 chromosomes?Explanation / Answer
12. D. Zygote- morula- blastocyst- embryo.
Zygote undergoes cleavage to form morula which changes in to blastula by rearrangement of cells and eventually form embryo.
13. A. Are found in the trophoblasts.
14. D. DNA contains thousands of genes on chromosomes.
DNA lies in chromosome and contains genes.
15. A. Development result by the correct expression and timing of expression of genes.
16. D. S -Phase.
S phase also called synthetic phase is the phase during which DNA synthesis occurs in the cell cycle.
17. A. Prophase.
Towards the end of prophase, nucleolus and nuclear membrane disappears.
18. B. Metaphase.
Spindle fibers attach to sister chromatids in Metaphase and brings chromosome to the equator.
19. A. Prophase.
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