Practice MC MT 2

Practice MC MT 2 - Place the following developmental events...

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Place the following developmental events in their proper chronological sequence: (1) formation of the neural tube, (2) movement of neural folds, and (3) thickening of neural ectoderm. a. 1, 2, 3 b. 2, 1, 3 c. 3, 1, 2 d. 3, 2, 1 e. None of the above The segmented characteristic of human embryonic development is evident from bricklike structures that form along the notochord, which are called a. neural tubes. b. mesoderm. c. ectoderm. d. somites. e. somatomeres. Which of the following statements about animal development is false? a. Signaling molecules interact to produce different combinations of signals that eventually guide embryonic cells to differentiate along different pathways. b. β -catenin is necessary but not sufficient for the formation of the primary embryonic organizer. c. Blastomeres are early embryonic cells. d. The mouth of the sea urchin forms where the archenteron makes contact with the ectoderm. e. Cells actively migrate during gastrulation. The movement of cells toward the blastopore is called a. mass cellular migration. b. embryonic cellular integration. c. cellular destiny. d. furrowing. e. epiboly. After gastrulation, the endodermal cells contribute predominantly to the developing a. brain, nervous system, and nails. b. skeletal system and muscles. c. lining of the digestive and respiratory tracts. d. sweat glands and milk secretory glands. e. None of the above During cleavage, the number of cells in a developing frog embryo increases. The cytoplasm in these new cells a. comes from the egg cytoplasm. b. is synthesized by the blastomeres. c. does not contain any yolk. d. is the vegetal pole. e. undergoes mitosis. In the early half of the menstrual cycle, before ovulation, which steroid hormone is at its highest level in the blood? a. Estrogen b. Follicle-stimulating hormone c. Luteinizing hormone d. Progesterone e. Testosterone In mammals, which is the correct sequence of structures through which a sperm passes before fertilizing an egg?
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a. Uterus, vagina, cervix, oviduct, ovary b. Vagina, cervix, uterus, oviduct c. Oviduct, uterus, vagina, ovary, body cavity d. Vagina, cervix, oviduct, uterus e. Vagina, uterus, oviduct, body cavity In male gametogenesis, the second meiotic division produces four haploid a. germ cells. b. primary spermatocytes. c. secondary spermatocytes. d. spermatids. e. spermatogonia. Which of the following statements about asexual reproduction is false ? a. Cell division occurs only by mitosis. b. Populations can grow until limited by resources. c. Single individuals can produce offspring. d. Genetic diversity in a population is generated in changing environments. e. No energy expenditure is required for mating and fertilization. Which of the following statements about hormonal responses is false?
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This note was uploaded on 03/05/2008 for the course LIFESCI 2 taught by Professor Pires during the Winter '08 term at UCLA.

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Practice MC MT 2 - Place the following developmental events...

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