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Embryonic development Knowledge-Based Practice

Biology · Human Body & Physiology · Biology · Reproduction & Development

5 Biology practice questions on Embryonic development. Questions that assess core concepts and understanding.

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Questions

  1. 1.

    During human embryonic development, which transient mesodermal structure provides the primary inductive signals that stimulate the overlying ectoderm to form the neural plate?

    • A) Trophoblast
    • B) Primitive streak
    • C) Yolk sac
    • D) Notochord
  2. 2.

    During human embryonic development, which extraembryonic membrane directly encloses the fluid-filled sac that cushions the embryo against mechanical shock and prevents desiccation?

    • A) Allantois
    • B) Amnion
    • C) Chorion
    • D) Yolk sac
  3. 3.

    During early human embryonic development, which component of the blastocyst directly gives rise to the tissues of the embryo proper?

    • A) Trophoblast
    • B) Inner cell mass
    • C) Blastocoel
    • D) Zona pellucida
  4. 4.

    During the cleavage stage of human embryonic development, how do the size of individual blastomeres and the total volume of the embryo change?

    • A) Individual blastomeres increase in size, and the overall volume of the embryo expands significantly.
    • B) Individual blastomeres decrease in size with each division, while the overall volume of the embryo remains essentially unchanged.
    • C) Individual blastomeres maintain a constant size, causing the overall volume of the embryo to double after every division.
    • D) Individual blastomeres decrease in size, leading to a marked decrease in the overall volume of the embryo.
  5. 5.

    During human embryonic development, which of the following events characterizes the stage of gastrulation?

    • A) Rapid mitotic cleavage divisions that transform the unicellular zygote into a solid sphere of blastomeres
    • B) Attachment and embedding of the blastocyst into the receptive epithelial lining of the maternal endometrium
    • C) Folding and fusion of the ectodermal neural plate to establish the precursor of the central nervous system
    • D) Extensive cell migration and tissue rearrangement that establish the three primary germ layers

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