Fertilization in sea urchin eggs involves Ca2+ release from the endoplasmic reticulum for cortical granule reactivation. The major molecule responsible for releasing Ca2+ from intracellular stores is (1) zonapellucida glycoproteins […]
Tag: CSIR NET Life Science Free Test on Gametogenesis and Fertilization
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CSIR NET Life Science Previous Year Questions and Solution on Cell-Cell Communication
Demonstrating Izumo-Juno Interaction: Key Experiments in Mammalian Fertilization
During fertilization in mammals proteins lzumo and Juno are required for recognition of sperm and egg. lzumo and Juno are found specifically in sperm and egg, respectively. Which one of […]
CSIR NET Life Science Previous Year Questions and Solution on Basic Concepts of Development
How Non-Functional Ovastacin Impacts Polyspermy Prevention in Human Fertilization
Human sperms are allowed to fertilize ova having non- functional ovastacin. The following possibilities may be of significance in the fusion of these gametes: A. The sperms will not fertilize […]
CSIR NET Life Science Previous Year Questions and Solution on Development Biology
Acrosomal Vesicles in Sea Urchin Sperm: Key Players in Fertilization Through Enzymatic Action
Membrane-bound, Golgi-derived structures containing proteolytic enzymes in sperms of sea urchin are called (1) cortical granules (2) micromeres (3) acrosomal vesicles (4) macromeres The membrane-bound, Golgi-derived structures in sea urchin […]
CSIR NET Life Science Previous Year Questions and Solution on Development Biology
Effect of ZP3 Post-Translational Modifications on Sperm-Egg Interaction and Fertilization
During fertilization “in mammals, sperm-egg interaction is mediated by zona pellucida (ZP) membrane proteins and their receptors present in sperm membrane. ZP3 has been identified to be the principle ZP […]
CSIR NET Life Science Previous Year Questions and Solution on Development Biology
Key Biochemical Changes During Mammalian Sperm Capacitation: Cholesterol and Glycoprotein Removal
23. Capacitation of mammalian sperms allows them to be activated within the uterus and facilitate fertilization. The following statements were made regarding events occurring during capacitation: A. removal of cholesterol […]
CSIR NET Life Science Previous Year Questions and Solution on Development Biology
How the Female Reproductive Tract Activates Mouse Sperm for Successful Fertilization
In an experiments, sperm removed from epididymis of a male mouse was added in a dish containing appropriate media and oocyte. No fertilization was seen. However, when sperm from epididymis […]
CSIR NET Life Science Previous Year Questions and Solution on Development Biology
Human Sperm Capacitation: The Critical Maturation Process Occurring in the Ampulla of the Oviduct
21. Capacitation of sperms in humans (1) occurs during copulation. (2) occurs after the acrosome reaction. (3) takes place in the ampulla of the oviduct. (4) takes place in the […]
CSIR NET Life Science Previous Year Questions and Solution on Development Biology
How Progesterone Initiates Meiotic Resumption in Amphibian Oocytes
Amphibian oocytes remain for years in the diplotene stage of meiotic prophase. Resumption of meiosis is initiated by (1) gonodatropic hormone. (2) growth hormone. (3) oestrogen. (4) progesterone. Introduction […]
CSIR NET Life Science Previous Year Questions and Solution on Development Biology
Stepwise Process of Fertilization in Amphibians: From Sperm Chemoattraction to Sperm Entry
19. During fertilization in amphibians, the fusion of egg and sperm plasma is preceeded by (A) release of enzymatic contents from the acrosomal vesicle through exocytosis (B) binding and interaction […]
