The contribution of b-cells is mainly in Humoral immunity. Thus Option A is correct.
<h3>
What is immune system?</h3>
Two types of immunity such as innate immunity is an inbuilt nonspecific immune system protect us from all antigens.
Secondly, we have one more sophisticated adoptive immune system which is up two types humoral immunity and cell mediated immunity.
The adoptive response majorly done by two types of cells such as B and T cells.
This type of immune response use past experience identify a specific foreign threats and counteract them when these threats reappear.
The humoral immune system is activated by external macromolecules antibodies, antimicrobial peptides etc. and protect the extracellular spaces of body.
Hence, Option A is correct.
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Answer:
Glycerophospholipids: Lipids with phosphate-containing head groups. It is a class of lipids that is most abundant in the biological membranes. In this type of lipid, fatty acids are linked by an ester oxygen to the carbon 1 and 2 of glycerol molecule which is the back bone of the molecule.
Cerebrosides: Fatty acid linked through an amide bond to the sphingosine C(2)-amine. They are one of the most important component in nerve membrane and animal muscle
Gangliosides: Anionic phospholipids containing one or more sialic acid residue.They are found abundant in the nervous system of animals and human beings.
Sphingolipids: Built on sphingosine. They are also found in the brain and have enigmatic nature.
Answer:
<em>Ana-phase 1 of Meiosis 1 in Male Parent...</em>
Explanation:
It is clear that meiosis is only happening in male due to AAa nondisjuction of dominant AA from male parent. The disjunction is occuring during spermato-genesis during Ana-phase 1 of Meiosis 1 cause it is only possible explanation of tri-somy at Chromosome 1...
The right answer is The plant cell wall provides a more rigid structure.
Plant cells are differentiated from animal cells by the cell wall (among others, they differ in size, vacuoles and the presence of chloroplasts). This wall, called the pectocellulosic wall (composed of pectin and cellulose), gives a rigid structure to the cell and a polygonal morphology to the cell.