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 […]
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CSIR NET Life Science Previous Year Questions and Solution on Basic Concepts of Development
Developmental Specification in Newt Gastrula: Insights from Tissue Transplantation Experiments
Which of the inferences (A-D) given below would you draw from the following tissue transplantation experiments performed with the early and late gastrula stages of the newt? (A) Cells of […]
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 Basic Concepts of Development
Differentiation and Fate Determination in Frog Gastrula Neurons: Conditional vs Autonomous Specification
When the prospective neurons from an early gastrula of a frog were transplanted into the prospective epidermis region, the donor cells differentiated into epidermis. However, when a similar experiment was […]
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 Basic Concepts of Development
Specification of Tissue Lineages in Tunicate Embryos: Autonomous and Conditional Modes
When 8-cell embryo of tunicates is separated into 4 blastomere pairs and allowed to grow independently in culture medium, then each blastomere pair can form most the cell types; however, […]
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 Basic Concepts of Development
Intercellular Signaling and Fate Specification of the EMS Blastomere in Caenorhabditis elegans Embryos
C. elegans embryo uses both autonomous and conditional modes of specification. The following statement are about specification of cell lineages: (A) The signals from the P1 blastomere instructs the EMS […]
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 Basic Concepts of Development
Conditional Specification and Gene Regulation in the EMS Blastomere of Caenorhabditis elegans Embryos
The following figure represents the interaction between different blastomeres in a 4-cell stage of C. elegans embryo: The following statements were made regarding the above: A. The fate of […]
