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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.
Why did scientists want to map the human genome? They wanted to learn the location of all the significant genes in the genome in order to learn how the genome is organized, ho
Plants - Rapidly Flowing Waters Among the plants only small, well attached forms, such as sessile algae can survive here. Thus, due to the presence of only a few plants, the n
Cloning Cloning is the procedure of creating an identical copy of something. It together refers to procedures used to form copies of DNA fragments (molecular cloning), cells (c
what are the types of polyembryony?
Nucellus - Ovule Enclosed within the integuments lies a homogenous mass of tissue which is termed as the nucellus. This is the tissue in which the female gametophyte differen
Bacteria called extremophiles are able to grow in hot springs such as Old Faithful at Yellowstone National Park in Wyoming. Do you think that the DNA of extremophiles would have a
Some of the characteristics of Bt cotton are: 1. Long fibre and resistance to aphids 2. Medium yield, long fibre and resistance to beetle pests 3. High yield and produ
What is the goal of risk assessment? The goal of risk assessment is to provide risk managers, who might be, for example, government regulatory officials, industry health a
List the advantages and disadvantages of stage 2 surgery using a tissue punch. Advantages - Less traumatic to surrounding tissue - Faster progress to the impression proce
What is succession?
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