Quiz: Everything About Embryo Development (Embryogenesis)

41 Questions | Total Attempts: 300

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Quiz: Everything About Embryo Development (Embryogenesis) - Quiz

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Questions and Answers
  • 1. 
    Which of the following statements concerning growing primary follicle is CORRECT?
    • A. 

      The granulosa layer of cells secrete androgens

    • B. 

      Fluid filled spaces appear between the granulosa layer of cells

    • C. 

      The zona pellucida is absent

    • D. 

      The theca externa layer of the cells rest on a basal lamina

    • E. 

      The granulosa layer of cells rest on a basal lamina

  • 2. 
    Which of the following statements regarding Mature Graafian follicles is NOT CORRECT?
    • A. 

      LH stimulates theca externa cell to produce and secrete estrogens

    • B. 

      FSH stimulates SER of granulosa cells to transform androstenedione into estrogens

    • C. 

      The corona radiata cells sends out cytoplasmic extensions thru the zona pellucida to the plasma membrane of the oocyte

    • D. 

      LH stimulates theca interna cell to produce and secrete androstenedione

    • E. 

      The LH surge causes ovulation of the oocytes

  • 3. 
    Which of the following statements regarding loose connective tissue is NOT CORRECT?
    • A. 

      Tendon is an excellent example of loose connective tissue

    • B. 

      Is found beneath epithelia as in the lamina propria

    • C. 

      Has an abundance of cell types

    • D. 

      Is found around blood vessels and glandular units

    • E. 

      Has an abundance of ground substance within the tissue spaces

  • 4. 
    Which of the following statements concerning collagen biosynthesis is CORRECT?
    • A. 

      Specific proteases remove the registration peptide outside the cytoplasm of the fibroblast cell

    • B. 

      Hydroxylation of specific glycine residues takes place in the Golgi apparatus

    • C. 

      Glycosylation of hydroxyglycine molecules occurs in the RER

    • D. 

      Procollagen molecules are insoluble due to the registration peptide

    • E. 

      The tropocollagen molecule is composed of only 2 polypeptide chains

  • 5. 
    Which of the following statements regarding glycosaminoglycans (GAG) is CORRECT?
    • A. 

      Hyaluronic acid is regarded as a proteoglycan and not a GAG

    • B. 

      Do not allow diffusion of water and soluble materials

    • C. 

      Are composed of a core polysaccharide chain to which is attached several proteins

    • D. 

      Have a high negative charge

    • E. 

      Are not present in cartilage

  • 6. 
    Which of the following statements concerning an allergic reaction is CORRECT?
    • A. 

      Antigens from pollen bind directly to mast cells causing them to secrete IgE antibodies

    • B. 

      Antibody IgE binds to fibroblast cells

    • C. 

      Adipose cells secrete IgG

    • D. 

      IgE antibodies secreted by plasma cells binds to the surface of mast cells

    • E. 

      Fibroblast cells secrete heparin and histamine

  • 7. 
    During the first six days of embryonic development:
    • A. 

      The zona pellucida disappears around the 5 6 day stage of development

    • B. 

      Blastomeres divide primarily by meiosis

    • C. 

      The morula has acquired a cavity that is filled with fluid

    • D. 

      Blastomeres at the 8 cell stage not only divide by mitosis but increase in size

    • E. 

      The inner cell mass secretes human chorionic gonadotropin

  • 8. 
    During the second week of embryonic development:
    • A. 

      The embryo proper is referred to as a bilaminar germ disc

    • B. 

      The trophoblast layer forms the inner cell mass

    • C. 

      The cytotrophoblast layer secretes luteinizing hormone

    • D. 

      The amnion is connected to the hypoblast layer

    • E. 

      Syncytiotrophoblast gives rise to the secondary yolk sac

  • 9. 
    The primitive uteroplacental circulation occurs as a result of
    • A. 

      Syncytiotrophoblast cells eroding the lining of maternal blood vessels and allowing the blood to enter the lacunae (spaces)

    • B. 

      Blood vessels developing in the wall of the yolk sac

    • C. 

      Cytotrophoblast cells forming lacunae (spaces)

    • D. 

      The inner cell mass developing blood vessels

    • E. 

      Blood vessels forming in the extraembryonic mesoderm

  • 10. 
    At the time of ovulation, the developing egg is arrested at which stage of development?
    • A. 

      Leptotene stage of meiosis I

    • B. 

      Prophase 1 of meiosis 1

    • C. 

      Zygotene stage of meiosis II

    • D. 

      Diplotene stage of meiosis I

    • E. 

      Metaphase stage of meiosis II

  • 11. 
    Which of the following cell types is present two years after birth?
    • A. 

      Primary spermatocytes

    • B. 

      Spermatids

    • C. 

      Spermatogonia

    • D. 

      Oogonia

    • E. 

      Secondary oocytes

  • 12. 
    Which hormone is involved in the development of the uterus during the proliferative phase of the menstrual cycle?
    • A. 

      Estrogen

    • B. 

      Human chorionic gonadotropin (HCG)

    • C. 

      Progesterone

    • D. 

      Follicle stimulating hormone (FSH)

    • E. 

      Luteinizing hormone (LH)

  • 13. 
    Which hormone is involved in the formation of the corpus luteum?
    • A. 

      Follicle stimulating hormone

    • B. 

      Activin

    • C. 

      Progesterone

    • D. 

      Luteinizing hormone

    • E. 

      Human chorionic gonadotropin

  • 14. 
    Which of the following processes during fertilization is CORRECT regarding prevention of polyspermy?
    • A. 

      The destruction of the zona pellucida by acrosin

    • B. 

      Alteration of the oocyte plasma membrane and zona pellucida due to the release of enzymes from the cortical granules

    • C. 

      Stabilization of the oocyte plasma membrane due to the release of enzymes from the cortical granules

    • D. 

      Release of enzymes by the sperm resulting in the breakdown of the corona radiata

    • E. 

      The widening of the perivitelline space between the oocyte plasma membrane and the zona pellucid

  • 15. 
    Which of the following processes is involved in the formation of the three germ layers?
    • A. 

      Angiogenesis

    • B. 

      Neural crest migration

    • C. 

      Neurulation

    • D. 

      Gastrulation

    • E. 

      Invagination of endodermal cells

  • 16. 
    During the formation of the trilaminar embryo, ectoderm and mesoderm are derived from:
    • A. 

      Chorion

    • B. 

      Hypoblast

    • C. 

      Amnioblasts

    • D. 

      Epiblast

    • E. 

      Exocoelomic (Heuser's) membrane

  • 17. 
     Which of the following statements regarding mesodermal cell migration is NOT CORRECT?
    • A. 

      The intraembryonic mesoderm becomes continuous with the extraembryonic mesoderm

    • B. 

      In front of the prochordal plate, the mesoderm forms the cardiogenic area

    • C. 

      The mesodermal cells between the prochordal plate and primitive knot form the notochordal rod (tube)

    • D. 

      Cells migrate in all regions between the epiblast and hypoblast

    • E. 

      Mesodermal cells on either side of the notochord form the paraxial mesoderm

  • 18. 
    Which of the following structures is derived from the ectodermal germ layer?
    • A. 

      The central nervous system

    • B. 

      The lining of the respiratory tract

    • C. 

      Muscle cells

    • D. 

      Lining of the digestive tube

    • E. 

      The kidney

  • 19. 
    The presence of cytokeratin in an analysis of a tumor would suggest that it is present in:
    • A. 

      Mesenchyme

    • B. 

      Neurons

    • C. 

      Epithelium

    • D. 

      Connective tissue

    • E. 

      Endoderm

  • 20. 
    Which of the following contributes to epithelial polarity?
    • A. 

      Presence of an intact basal lamina

    • B. 

      Gap junctions

    • C. 

      Membrane fluidity

    • D. 

      Presence of desmosomes

    • E. 

      Location of golgi apparatus near the nucleus

  • 21. 
    Which of the following is found primarily in the lamina densa of the basement membrane?
    • A. 

      Entactin

    • B. 

      Type IV collagen

    • C. 

      Microfibrils

    • D. 

      Laminin

    • E. 

      Reticular fibers

  • 22. 
    Which of the following statements is CORRECT for epithelia?
    • A. 

      They are incapable of performing absorptive functions

    • B. 

      Certain types may contain apical specializations

    • C. 

      They are surrounded by an abundance of extracellular matrix

    • D. 

      They demonstrate weak adhesion between cells

    • E. 

      They are highly vacularized

  • 23. 
    Which of the following statements BEST describes basal folds?
    • A. 

      They possess cilia

    • B. 

      They function in exocytosis

    • C. 

      They are involved in lipid transport

    • D. 

      They are associated with cells involved in active transport

    • E. 

      They make up part of the terminal web

  • 24. 
    Plasma cells are derived from which of the following?
    • A. 

      Macrophages

    • B. 

      Fibroblast

    • C. 

      T lymphocytes

    • D. 

      Monocytes

    • E. 

      B lymphocytes

  • 25. 
    On the basal side of the cell, the cytoskeleton of the cell communicates with the extracellular matrix across the plasma membrane by means of:
    • A. 

      Cadherins

    • B. 

      Integrins

    • C. 

      Proteoglycans

    • D. 

      Microtubules

    • E. 

      Tonofilaments

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