18. Fertilization in sea urchin involves interaction of sperm Bindin with its receptor EBR1, a 350 kDa glycoprotein on the egg vitelline membrane. The plot given below shows the status […]
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CSIR NET Life Science Previous Year Questions and Solution on EXTENSION OF MENDELIAN PRINCIPLES (62)
CSIR NET Life Science Previous Year Questions and Solution on Basic Concepts of Development
Autonomous and Conditional Specification in Early Caenorhabditis elegans Embryo Development
During early cleavage of Caenorabditis elegans embryos, each asymmetrical division produces one founder cell which produces differentiated descendants and one stem cell. The very first cell division produces one anterior […]
CSIR NET Life Science Previous Year Questions and Solution on Basic Concepts of Development
Example of Conditional Specification in Sea Urchin Embryo Development
If the blastomeres of a 4 celled sea urchin embryo are isolated each blastomere can form a pluteus larvae. This is example of (1) Autonomous specification (2) Conditional specification (3) […]
CSIR NET Life Science Previous Year Questions and Solution on Development Biology
Debunking Common Misconceptions in Sea Urchin Fertilization: The Role of Ca2+, Resact, and IP3
Several marine organism release their gametes into the environment, where sperm attraction and subsequent events lead to successful fertilization. With reference to sea urchins, which one of the following statements […]
CSIR NET Life Science Previous Year Questions and Solution on Basic Concepts of Development
Understanding Cell Potency and Fate Specification in Embryonic Development
The fate of a cell or a tissue is specified when it is capable of differentiating autonomously on being placed in a neutral environment with respect to the developmental pathway. […]
CSIR NET Life Science Previous Year Questions and Solution on Development Biology
Understanding Fast and Slow Blocks to Polyspermy in Sea Urchin Fertilization
Polyspermy results when two or more sperms fertilize an egg. It is usually lethal since it results in blastomeres with different numbers and types of chromosomes. Many species therefore, have […]
CSIR NET Life Science Previous Year Questions and Solution on Basic Concepts of Development
Defining Determination in Embryonic Development: Key Characteristics and Misconceptions
Given are certain facts which define ‘determination’ of a developing embryo. A. Cells have made a commitment to a differentiation program. B. A phase where specific biochemical actions occur in […]
CSIR NET Life Science Previous Year Questions and Solution on Development Biology
Key Factors Affecting Bindin-Egg Interaction in Sea Urchin Fertilization and Their Role in Preventing Fertilization
15. For successful fertilization in sea urchin, interaction between the surface of the egg and acrosomal proteins, specifically a 30.5 kDa protein called bindin, is necessary. The following factors could […]
CSIR NET Life Science Previous Year Questions and Solution on Basic Concepts of Development
Cell Commitment in Development: Understanding Determination in Embryogenesis
During development, if a cell has committed to a particular fate, it is said to be (1) pluripotent (2) totipotent (3) determined (4) differentiated During the development of multicellular organisms, […]
CSIR NET Life Science Previous Year Questions and Solution on Development Biology
Key Events in Sea Urchin Fertilization: The Roles of Bindin, Acrosomal Reaction, and Cortical Granule Response
Following statements are made about fertilization occurring in sea urchins: A. Chemoattraction of the sperm to the egg is mediated by sperm activating peptides like bindin. B. Exocytosis of the […]
