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In the adaptive immune response, do Helper T cells activate B cells and cytotoxic T lymphocytes to kill infected host cells? Do Helper T cells phagocytize bacteria and viruses?
T helper is the cell which is activated by the macrophage. It has unique receptor called APC(antigen presenting cell). When the foreign antigen being eaten by the macrophage, some parts...
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What are more important, red blood cells or white blood cells? Why?
White blood cells are one the most important parts of our immune system. The various types of white blood cells work together to protect us against bacteria, viruses, parasites, infections...
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What stops the white blood cells from attacking our own body cells? What is the role of the lymphatic system in the maturation of all the different types of white blood cells?
What stops the white blood cells from attacking our own body cells? White blood cells act on antigens, which signal that a certain molecule is foreign. Bodily cells lack these...
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How do white blood cells know what to kill? How do white blood cells know to kill bacteria cells and not human cells. How do they differentiate between the two?
The body recognizes chemical structures that are made by bacteria and quite different from chemicals made by higher organisms. These chemical structures include the special carbohydrates (sugars) and lipids that...
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What are the 3 sources of stem cells?
The sources of stem cells are:- For an adult stem cell, Cold blood Bone Marrow Umbilical Cord Skin Teeth Placental tissue For an embryonic stem cell,...
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What are pluripotent stem cells used for?
By definition, a cell that is 'pluripotent' is one that can differentiate into any cell type. This includes cells of the ectoderm, mesoderm and endoderm. Embryonic stem cells (ESCs) are...
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What are the characteristics of stem cells?
The 2 main types of stem cells involve: Pluripotent : stem cells that have the potential to develop into any human cell. Multipotent: stem cells that can develop into some...
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Why are embryonic stem cells important?
Embryonic cells from humans and certain other mammalian can be grown in tissue cultures. The human embryo stem cells form a wide variety of differentiated tissue in - vitro ....
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Why is embryonic stem cell research important?
embryonic stem cell are totipotent they can be divided and can dedifferentiated into different cells, tissues or organs. so we can use them to transplant in patients, so it can...
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A test tube is inoculated with 1 x 10^3 cells of bacterial strain that has a generation time of 30 minutes. the carrying capacity of the test tube for this strain is 6 x 10^9 cells. What will the bacterial population be after 90 minutes of culturing?
After 60 minutes there will be in number $2×10^3$ An after 90minute it will be $4×10^3$
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