Circulation Systems in Organisms Quiz
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Questions and Answers

Which event marks the start of the second phase of mitosis?

  • Splitting of centromere and separation of chromatids
  • Complete disintegration of nuclear envelope (correct)
  • Movement of chromosomes to spindle equator
  • Formation of asters and spindle equator

    • In the context of cell transport, which statement best describes passive transport?

  • Involves the Na+ - K+ pump
  • Involves movement against a concentration gradient
  • Transport of molecules that does not use ATP (correct)
  • An energy-independent process

    • What exemplifies the Na+ - K+ pump in cell biology?

  • An energy-independent process
  • Golgi apparatus
  • Active transport (correct)
  • Ribosomes

    • Which sequence represents the correct sub-stages of prophase I in meiosis?

    <p>Leptotene → Zygotene → Diplotene → Diakinesis → Pachytene</p> Signup and view all the answers

    Which sub-stages of prophase-I in oocytes can extend over months or years in some vertebrates?

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

    What is NOT a characteristic of the start of the second phase of mitosis?

    <p>Splitting of centromere and separation of chromatids</p> Signup and view all the answers

    Which of the following organisms does not have a body cavity that facilitates the exchange of essential substances through water circulation?

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

    Which of the following statements about the role of the sinoatrial node (SAN) in the human heart is incorrect?

    <p>The SAN is solely responsible for the depolarization of the ventricles.</p> Signup and view all the answers

    During the cardiac cycle of a normal adult human, the flow of blood into the ventricles increases by about 30% during which phase?

    <p>Atrial systole</p> Signup and view all the answers

    If the percentage saturation of hemoglobin with oxygen is plotted against the partial pressure of oxygen (pO2), the shape of the resulting curve will be a:

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

    The epithelial tissue present in the alveoli of the human lungs is:

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

    The effect of sympathetic neural signals on the rate of the heart beat is similar to the effect of which substance on the heart?

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

    Which of the following statements about nuclear envelope disintegration during cell division is correct?

    <p>The nuclear envelope disintegrates during prophase to allow spindle fiber attachment to kinetochores.</p> Signup and view all the answers

    Which of the following processes is an example of active transport?

    <p>The $Na^+$-$K^+$ pump that maintains the electrochemical gradient across cell membranes.</p> Signup and view all the answers

    During which phase of mitosis do the chromosomes align at the metaphase plate or equator?

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

    Which of the following events occurs during anaphase of mitosis?

    <p>Centromeres split, and sister chromatids separate.</p> Signup and view all the answers

    Which of the following statements about passive transport is correct?

    <p>Passive transport moves substances down their concentration gradient.</p> Signup and view all the answers

    Which of the following events occurs during telophase of mitosis?

    <p>The nuclear envelope re-forms around the separated chromosomes.</p> Signup and view all the answers

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