18 Questions
Which event marks the start of the second phase of mitosis?
Complete disintegration of nuclear envelope
In the context of cell transport, which statement best describes passive transport?
Transport of molecules that does not use ATP
What exemplifies the Na+ - K+ pump in cell biology?
Active transport
Which sequence represents the correct sub-stages of prophase I in meiosis?
Leptotene → Zygotene → Diplotene → Diakinesis → Pachytene
Which sub-stages of prophase-I in oocytes can extend over months or years in some vertebrates?
Diplotene
What is NOT a characteristic of the start of the second phase of mitosis?
Splitting of centromere and separation of chromatids
Which of the following organisms does not have a body cavity that facilitates the exchange of essential substances through water circulation?
Pheretima
Which of the following statements about the role of the sinoatrial node (SAN) in the human heart is incorrect?
The SAN is solely responsible for the depolarization of the ventricles.
During the cardiac cycle of a normal adult human, the flow of blood into the ventricles increases by about 30% during which phase?
Atrial systole
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:
Sigmoid
The epithelial tissue present in the alveoli of the human lungs is:
Squamous
The effect of sympathetic neural signals on the rate of the heart beat is similar to the effect of which substance on the heart?
Adrenaline
Which of the following statements about nuclear envelope disintegration during cell division is correct?
The nuclear envelope disintegrates during prophase to allow spindle fiber attachment to kinetochores.
Which of the following processes is an example of active transport?
The $Na^+$-$K^+$ pump that maintains the electrochemical gradient across cell membranes.
During which phase of mitosis do the chromosomes align at the metaphase plate or equator?
Metaphase
Which of the following events occurs during anaphase of mitosis?
Centromeres split, and sister chromatids separate.
Which of the following statements about passive transport is correct?
Passive transport moves substances down their concentration gradient.
Which of the following events occurs during telophase of mitosis?
The nuclear envelope re-forms around the separated chromosomes.
Test your knowledge on circulation systems in various organisms and their body cavities. Questions cover topics like water circulation in Hydra, Sycon, Obelia, and Pheretima, as well as the functions of nodal tissue in the heart.
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