#Question id: 5675
#Unit 5. Developmental Biology
Following are the statements related to mammalian chaemotaxis:
A. During chaemotaxis, the oocyte and its accompanying cumulus cells secrete molecules that attract only uncapacitated sperm toward the egg during the last stages of sperm migration.
B. These chaemotactic compound are hormone progesterone, which is made by the cumulus cells.
C. Progesterone has been shown to bind to a receptor that activates Ca2+ channels in the cell membrane of the sperm tail, leading to sperm hyperactivity and provides directional cue.
D. Cumulus cells also secrete a substance, CRISP1, that attracts sperm and hyperactivates them through CatSper channels similar as in sea urchins.
Which of the following statement is incorrect?
#Question id: 10932
#Unit 7. System Physiology – Animal
A 62-year-old man complains of headaches, visual difficulties, and chest pains. His examination shows a red complexion and a large spleen. His complete blood count follows: hematocrit, 58%, WBC 13,300/μl, and platelets 600,000/μl. His arterial oxygen saturation is 97% on room air. Which of the following would you recommend as a treatment?
#Question id: 28575
#Unit 5. Developmental Biology
β-catenin activation able to initiate ovary forming gene and at the same time it prevent the activation of those gene which crucial for testis determination?
#Question id: 26437
#Unit 3. Fundamental Processes
GC – TA transversion caused by the insertion of
#Question id: 1582
#Unit 4. Cell Communication and Cell Signaling
The EBV antigen fragments will be presented by the virus-infected cells along with which of the following?