Answer:
Each one has two fatty acid chains and the glycerol backbone is bonded to a small polar group.
Explanation:
Phospholipid is a unique form of lipid. The bonding of the glycerol backbone to the polar phosphate group makes phospholipid to have dual solubility unlike general triglycerides.
The polar head is said to be hydrophillic that is <u>water loving,</u> while the two carbon chains that retained lipid features are hydrophobic <u>water hating.</u>
Therefore if a phopholipid is placed in water, in relation to its functions as component of cell membrane, it forms a bi-layer in which the water loving portion hydrophilic head points into the surrounding watery medium, while the hydrophobic layer points inwards far away from the watery medium into the internal cellular layer to form an impermeable barrier to hydrophilic (polar) substances.
This forms the basis of the phospholipd bilayer of the cell membrane. And it controls the permeability of the cell membrane to influx substances into the cells.
The Himalayan mayapple<span> is not an easy plant to </span>get<span> hold of. Yet we humans keep trying, because the poisonous plant also naturally produces </span>podophyllotoxin<span>, a preliminary compound in etoposide—classed as an essential medicine by the World Health Organization (WHO)</span>
D) increases reproduction of native species
Explanation:
Non-invasive or non-native species or exotic species do not increase the reproduction rate of native species.
In fact, studies have shown that they reduce the rate of reproduction of the native ones.
- Invasive species where they are successful are huge threat to the stability of an ecosystem.
- Some invasive species are capable of destroying habitats by substituting for their functional roles.
- They compete with native species. In some cases, where an invasive specie is a predator, it preys on the native ones.
- Invasive species are capable of destroying the food source in an ecosystem.
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Answer:
a. the virus must be able to cross-link red blood cells directly.
Explanation:
Viral hemagglutination assay is a method which is used for the quantification of the relative concentration of the viruses.
The principle on which the hemagglutination assay works is as follows:
- There are sialic acid receptors present on the surface of the red blood cells which will bind to the haemagglutinin glycoprotein present on the surface of the viral particle.
- Due to the binding of the sialic acid receptors with haemagglutinin particle there will be cross-linking of the red blood cells by the viral particles and a lattice formation will take place.
- The lattice will remain suspended in the solution however if the concentration of the virus particles will be less, the lattice will settle down in the well.
Thus, this method allows knowing the relative concentration of the virus.
<em>Due to its basic principle of cross-linking this method works well for only a few viruses such as influenza virus. </em>
A bone cell, formed when an osteoblast becomes embedded in the matrix it has secreted.
