Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Q. How does the male gamete penetrate the egg cell? How does the female gamete protect itself from the entrance of more gametes after the entrance of the first sperm cell?
The sperm cell that reaches the egg cell triggers the acrosome reaction, a process in which hydrolytic enzymes of the acrosome are released on the external surface of the zona pellucida that the protective layer that surrounds the egg cell. A portion of this layer is digested by the acrosomal enzymes permitting the sperm cell to reach the plasma membrane of the egg cell carrying out fecundation.
At the moment that the sperm cell makes contact with the egg cell membrane a chemical alteration of this membrane occurs and Enzymes secreted by exocytosis (cortical reaction) make the zona pellucida unable to bind to other sperm cells (zonal reaction) and other male gametes cannot enter the egg cell.
Q. From which germ layer do blood cells originate? What are other organs and tissues made from that germ layer? Blood cells have a mesodermal embryonic origin and other organs
How nutritional status influences the age? The nutritional status influences the age-related rate of functional decline in many organ systems in the body. Nutrition is also an
Determine the Lateral Cephalometric Skull View The use of this modality is limited in preoperative evaluation in implant placement for advance cases where there is a need for b
A diploid cell contains: A.one half of a complete set of chromosomes B.several complete sets of chromosomes C.the correct number of chromosomes D.two complete sets of chromosomes E
Q. Merits and Demerits of system classification? Merits The merits of this system\are as under: • Careful observation and original description of the genera from living
Q. Why can it be said that each glucose molecule runs the Krebs cycle twice? Each glucose molecule "cycles" the Krebs cycle twice because after glycolysis each used glucose has
CAUSE S OF VARIATION - Effect of environmental conditions Change in the gene pattern like - (a) Random distribution of homologous genes in meiosis (b) Crossing over
EXCRETOR Y ORGANS In protozoa through plasmalemma by diffusion. Contractile vacuole present for osmoregulation (absent in parasitic and marine protozoa). In porifera and
What is the evolutionary advantage of the occurrence of sperm cells and larval stage in the life cycle of sponges? The sexual reproduction in sponges, in addition to contributi
In his experiments, Mendel noted that when two traits are involved in a genetic cross, they are inherited independently of each other. The reason for this is that A. genes on the s
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd