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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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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 structures make plant and animal cells different?
Plant cells have cell wall, but animal cells lack. Plastids present in plant cells, usually absent in animal cells. Large vacuole presents in mature plant cells, while in animal...
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Plant cells differ from animal cells in what ways?
The plant cells have cell wall, large vacuoles, plasmodesmata, cementing of cells by calcium pectate etc. These charateristic features are absent in animal cells. Thank you
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A bacterial cell can divide several times in an hour. Few animal or plant cells can divide as quickly. Why is this?
typically have henomes of up to 14 million base pairs. This is very little when compared to the genome of i.e. humans. Humans have a genome of generally six...
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What type of cells are in both plant and animal cells?
Almost all plant and animal cells are eukaryotic, meaning they have a membrane around their cell, which can let and happen. They have many organelles, such as the Golgi apparatus,...
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What organelles are found in plant and animal cells and are also found in bacterial cells?
An organelle is one of the specialised and memebrane-bound structures inside the cytoplasm of a cell. That means the and cytoplasm can't be organelles. The only true organelles that all...
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Plant cells have cell walls too. What do yeast cells lack that plant cells have?
Yeasts are heterotroph. They are unable to produce their food by . Yeast cells lack chloroplasts. Thank you
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What are two diffrences in mitosis and cytokinesis between animal and plant cells?
Astral rays are formed at two opposite poles for contraction of chromosomes in the animal cell division, while this type structure is not found in plant cell. In the plants,...
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Why do plant cells that transport water against the force of gravity contain many more mitochondria than other plant cells do?
The process of transporting water against gravity is called , so called because it requires energy to occur (as opposed to passive transport which occurs naturally). Now, the molecule which...
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