Answer:
The intra-cellular pathogen is harder to target for the innate immune system because immune system has to by pass the external environment of the organism.
Explanation:
An Infection might be intracellular or extracellular, contingent upon the microorganism. All infections contaminate cells and recreate inside those cells (intracellularly), while microorganisms and different parasites may duplicate intracellularly or extracellularly, contingent upon the species.
The intrinsic resistant framework must react in like manner: by distinguishing the extracellular microbe or potentially by recognizing host cells that have just been tainted.
The innate immune system serves as a specialist on call for pathogenic dangers that sidestep characteristic physical and substance hindrances of the body. Utilizing a blend of cell and atomic assaults, the inborn resistant framework distinguishes the idea of a microorganism and reacts with aggravation, phagocytosis, cytokine discharge, pulverization by NK cells, as well as a supplement framework. At the point when natural systems are lacking to clear a disease, the versatile safe reaction is educated and prepared.
Answer: The part of DNA that the teacher was modelling would be the backbone of DNA.
Explanation:
The DNA is made of double helical structure which is twisted. In the structure of DNA two strands are coiled among each other.
The DNA consists of the nitrogenous bases, phosphate groups and deoxy-ribose sugar.
The backbone of DNA is made up of sugar( alternating )and phosphate group.The nitrogenous bases such as adenine, cytosine ,guanine and thymine are joined to the deoxy-ribose sugar.
This backbone part was part that the teacher was making as a model by using two coiled springs.
I think the correct answer is option B
TRUE, Epithelial cells are avascular, they have not blood vessels. The only way your "true" outer skin can get nourishment is by diffusion / osmosis from connective tissue just below it. The observable part of your skin is actually dead. Among other reasons, it is too far from the vascular connective tissue to diffuse it's nourishment.