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Q. How different are the actions of antibodies against virus and against bacteria? Why is the cellular immune response activated in case of chronic viral infection?
The antibodies of the humoral immune system act against extracellular agents, like bacteria or toxins but they are not active in the intracellular space and they cannot fight virus efficiently.
In case of viral infection (and also of precancerous or cancerous cells) the immune attack is made by the cellular immune system, mediated by NK (natural killers) and T, lymphocytes that destroy specific virus and cells.
Q What is signifying by concentration gradient? Is it correct or not to refer to "concentration gradient of water"? Concentration gradient is the variation of concentration of
Benefits of Cross-Pollination Because of the specific benefits of cross-pollination, flowering plants have evolved many devices to prevent self-pollination and to encourage cr
Birth Marks (Naevi): Birth Marks is also known as naevi. It is a multiplication of one or more cutaneous elements within the skin. It is defined as a congenital, ci
Alternative polyadenylation sites Exact pre-mRNAs hold more than single group of signal sequences for 3' end polyadenylation and cleavage. In some cases, the area of t
Q. Principles of Binomial Nomenclature? There are certain, basic principles of binomial nomenclature which are as follows: i) Different nomenclatural systems are independent
Dopamine is important for working memory and drug that increases the level of dopamine in the brain or facilities the action of dopamine, enhances working memory capabilities.Dopam
Organic Substances - Abiotic Components These include carbohydrates, proteins, lipids and their derivatives which are derived from the waste products of plants and animals or
Which of the below are stems of plants that are leaf like in form, are green and perform functions of leaves. Additionally, they may bear fruit, flowers and temporary leaves?
What is an etiological agent of disease? An etiological agent of disease is the agent that causes the disease. It might be a living being, substance or environmental fact.
Which kind of plant tissue is cork? The Cork is the material for instance, used to cap wine bottles, and is extracted from the suber of a special oak called cork.
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