Protection of female gametes from male gametes
Explain, how the male gametes go through the egg cell? How the female gametes guard itself from entry of more gametes after the first sperm cell?
Expert
Sperm cell which reaches the egg cell activates the acrosome reaction, a procedure where the hydrolytic enzymes of the acrosome are liberated on the external surface of zona pellucida (a protective layer that surrounds the egg cell). Portion of this layer is digested by acrosomal enzymes offering the sperm cell to arrive at the plasma membrane of the egg cell performing the fecundation.
At the moment, that sperm cell forms the contact with egg cell membrane a chemical alteration of this membrane takes place. Enzymes liberated by the exocytosis form the zona pellucida not capable to bind to other sperm cells and other male gametes are not able to enter the egg cell.
Do echinoderms contain an excretory system? How is the excretion completed in such animals? Answer: Echinoderms do not contain an excretory system. Their excretions
What is the idea of universality of the genetic code? Explain the exceptions to this universality?
Define Host-Based System: (A) It is a system controlled by a central or main computer. The host-based system usually refers to a hierarchical communications system controlled by the central computer.
Define the tertiary structure of a protein? Explain the main kinds of tertiary structure?
Applications of metadata: A) Providing human-readable enrichment of computer-readable data B) Ability to suggest standards to improve data integration and flow Q : Complete evolutionary branch of the Explain the six criteria employed to build a complete evolutionary branch of the vertebrates?
Explain the six criteria employed to build a complete evolutionary branch of the vertebrates?
Order Fulfillment: The sequence of steps included in processing an order to the satisfaction of the customer and making the essential modifications in the inventory records. It might also comprise processing of returns and re-adjustment of the records
How fecundation completed in insects (internal or external)? Is there copulation among insects?
Demonstrate the formula DPD = SF – TP.
Describe the histological nature of the glands? Also state how they are formed?
18,76,764
1940534 Asked
3,689
Active Tutors
1455100
Questions Answered
Start Excelling in your courses, Ask an Expert and get answers for your homework and assignments!!