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SPERMEIOGENESIS / SPERMETOLEOSIS
It is the gradual differentiation of a stationary rounded and undifferentiated spermatid into an active and motile sperm.
The spermatids formed as a result of maturation divisions are typical undifferentiated animal cells containing mitochondira, golgi body and centriole but with a haploid set of chromosomes.
In spermeiogenesis following changes take place -
(i) Formation of acrosome
Formation of Acrosome
(ii) Formation of Perforatorium
A rounded small pit present below the nucleus, in this part G actin and Ca++ ions are present. This spaces is called perforatorium space.
(iii) Nuclear changes
(iv) Tail
(v) Formation of mitochondrial spiral and middle piece
(vi) Changes in the cytoplasm
(vii) Sperm sheath
Sperm sheath is form of mucopolysaccharide. It is also called glycocalyx. This sheath probably function as antigen.
nutrition in paramecium
What do you mean by Syconoid sponge. Of different sponge architectures, this is intermediate in its complexity. Spongocoel is no longer lined with choanocytes, now located in r
Early campaigns of the 19th century that focused on sanitation, hygiene, housing, and nutrition had little effect in controlling communicable disease due to flawed rationale based
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What is a brain freeze? What is commonly referred to as 'brain freeze' happens when you ingest something that is very cold too rapidly. When the cold touches your soft palate i
Define Reagents for Preparation of Phosphate Buffers? Buffer solutions of pH4, pH7 and pH 9.18 phosphate buffer solution: 0.1 M disodium hydrogen phosphate or Na 2 HPO 4
The quartenary structure of a holoenzyme contains four long polypeptide subunits composed of non-polar, polar and charged amino acids. All subunits are properly folded and function
Nonsurgical retreatment will be the preferred choice -Less invasive .. not cause problem to the pt. -Less traumatic postoperative .. most probably no post operative pain
Hydration Properties General conformation of individual proteins in solution is largely dependent on the interaction with water. The progressive hydration of proteins startin
nervous system of vertebrates
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