Stages of Pregnancy and Fertilization Quiz
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Questions and Answers

How is the need to prolong luteal life accomplished in primates and humans?

  • By secreting positive luteotropic factors
  • By producing estrogen in mid-gestation
  • By producing human chorionic gonadotropin (hCG) (correct)
  • By releasing interferon-τ (IFNτ)

    • What is the aim of the cortical reaction in fertilization?

  • To release interferon-τ (IFNτ)
  • To prevent polyspermy and activate egg metabolism (correct)
  • To form the ovum and 2nd polar body
  • To trigger the second meiotic division

    • What triggers the secondary oocyte to resume and complete its second meiotic division?

  • Entry of the sperm nucleus into the cytoplasm of the secondary oocyte (correct)
  • Cortical reaction
  • Release of interferon-τ (IFNτ)
  • Intracellular increase in Ca2+ ion concentration

    • What factor helps extend luteal life by producing estrogens in swine?

    <p>Estrogens</p> Signup and view all the answers

    What does the zygote transform into after undergoing mitotic divisions and modifications?

    <p>Blastocyst</p> Signup and view all the answers

    What is the main function of the ZP3 molecules in the zona pellucida?

    <p>To recognize integral proteins of the sperm plasmalemma</p> Signup and view all the answers

    What is the role of the acrosomal enzymes released during the acrosomal reaction?

    <p>To digest the zona pellucida and propel the sperm toward the oocyte</p> Signup and view all the answers

    How is the fusion between sperm and egg mediated?

    <p>By protein molecules fertilin in the sperm and integrins in the egg</p> Signup and view all the answers

    Where is the perivitelline space located?

    <p>Between the zona pellucida and the oocyte cell membrane</p> Signup and view all the answers

    What triggers the acrosomal reaction in sperm?

    <p>Integral proteins in the sperm plasmalemma</p> Signup and view all the answers

    What is the main function of ZP3 molecules in the zona pellucida?

    <p>Recognition of integral proteins of the egg plasmalemma</p> Signup and view all the answers

    What facilitates the fusion between the sperm and egg membranes?

    <p>Protein molecules fertilin in the sperm and integrins in the egg</p> Signup and view all the answers

    What is the role of acrosomal enzymes released during the acrosomal reaction?

    <p>Digest the zona pellucida allowing sperm entry into the egg</p> Signup and view all the answers

    Where is the perivitelline space located in relation to the oocyte?

    <p>Between the zona pellucida and egg plasmalemma</p> Signup and view all the answers

    What triggers the acrosomal reaction in sperm?

    <p>Recognition of integral proteins of the egg plasmalemma by ZP3 molecules</p> Signup and view all the answers

    What is the purpose of the cortical reaction during fertilization?

    <p>To prevent the occurrence of polyspermy and activate egg metabolism</p> Signup and view all the answers

    What triggers the secondary oocyte to resume and complete its second meiotic division?

    <p>Entry of the sperm nucleus into the cytoplasm of the secondary oocyte</p> Signup and view all the answers

    How is the need to prolong luteal life accomplished in swine?

    <p>By secreting estrogens with luteotropic action</p> Signup and view all the answers

    What does the zygote transform into after undergoing mitotic divisions and modifications?

    <p>Blastocyst</p> Signup and view all the answers

    What is the role of interferon-τ (IFNτ) in extending luteal life in cow and ewe?

    <p>To maintain the corpus luteum and act like LH</p> Signup and view all the answers

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