B) electron microscopes focus beams of light using magnetic fields
The biochemical processes in the order in which they occur during the menstrual cycle.
- FSH and LH stimulate the follicles to develop and the oocyte to produce estrogen.
- Rising estrogen levels suppress FSH production and the development of other follicles.
- Elevated levels of progesterone maintain the endometrial lining of the uterus.
- An LH surge causes the follicle to rupture.
- The breakdown of the corpus luteum causes progesterone levels to drop.
- The endometrial lining breaks down and low estrogen levels stimulate the pituitary gland to release FSH and LH.
<h3>How is the menstrual cycle regulated?</h3>
The menstrual cycle is regulated by the complex interaction of hormones: luteinizing hormone, follicle-stimulating hormone, and the female hormones estrogen and progesterone.
With this information, we can conclude that progesterone is a hormone that is responsible for regulating a woman's menstrual cycle, preparing the uterus to receive the fertilized egg and preventing it from being expelled by the body.
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Ans.
Opsonization is defined as an immune reaction that includes ingestion and elimination of a pathogens by phagocytes, with the help of antibodies and complement proteins.
The antibodies involve in opsonization are mainly IgG (gamma immunoglobulins). The IgG binds with pathogen via its Fab (antigen-binding fragment) domain and opsonizes it. The antibody-pathogen complex then binds with an immune cell via Fc (fragment of crystallization) domain of IgG antibody that triggers secretion of lytic proteins from immune cell to kill the pathogen.
Thus, 'opsonization is a representative of IgG antibody function.'
Glacial deposits, specifically till, of the same age and structure are found on many separate continents that would have been together in the continent of Pangaea. Fossil evidence for Pangaea includes the presence of similar and identical species on continents that are now great distances apart.