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What are B cells?
B cells are a type of white blood cell that plays a key role in the immune system. They are responsible for producing antibodies, which are proteins that can recognize and bind to specific foreign substances, such as viruses or bacteria. When activated, B cells can differentiate into plasma cells, which secrete large amounts of antibodies to help neutralize and eliminate the invading pathogens. B cells are an essential part of the adaptive immune response, providing long-term immunity against specific pathogens.
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Why are liver cells animal cells?
Liver cells are animal cells because they are part of the tissue and organ system of animals. They are eukaryotic cells, meaning they have a true nucleus and membrane-bound organelles, which are characteristic of animal cells. Additionally, liver cells perform specific functions related to the metabolism and detoxification of substances within the body, which are essential for the survival and functioning of animals. Therefore, liver cells are classified as animal cells due to their structure, function, and role within the animal body.
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What are the differences between embryonic stem cells, omnipotent stem cells, adult stem cells, totipotent stem cells, and multipotent stem cells?
Embryonic stem cells are derived from embryos and have the potential to develop into any type of cell in the body. Omnipotent stem cells, also known as pluripotent stem cells, are similar to embryonic stem cells in that they can differentiate into any type of cell, but they are derived from adult tissues. Adult stem cells are found in various tissues and have the ability to differentiate into a limited range of cell types. Totipotent stem cells have the highest potential for differentiation and can develop into any type of cell, as well as into extraembryonic tissues such as the placenta. Multipotent stem cells can differentiate into a limited number of cell types, typically within a specific tissue or organ.
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What are egg cells and sperm cells?
Egg cells, also known as ova, are the female reproductive cells produced by the ovaries. They are larger than sperm cells and contain genetic material from the mother. Sperm cells, on the other hand, are the male reproductive cells produced by the testes. They are smaller and more numerous than egg cells, and contain genetic material from the father. When an egg cell is fertilized by a sperm cell, it forms a zygote, which eventually develops into a new organism.
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What does the b b b mean?
The phrase "b b b" is often used to represent someone stuttering or hesitating in speech. It mimics the sound of someone repeating the letter "b" when they are struggling to get their words out. It is a way to convey a sense of hesitation, uncertainty, or nervousness in written communication.
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How do killer cells recognize infected body cells?
Killer cells, also known as cytotoxic T cells, recognize infected body cells through a process called antigen presentation. Infected cells display fragments of foreign proteins, known as antigens, on their surface using a protein called major histocompatibility complex (MHC) class I. Killer cells have receptors that can recognize these antigens when they are presented on the infected cell's surface. Once the killer cell identifies an infected cell, it releases toxic substances to destroy the infected cell and prevent the spread of the infection.
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How do you compare the components of plant cells, virus cells, and animal cells?
Plant cells, virus cells, and animal cells all have different components and structures. Plant cells have a cell wall, chloroplasts, and a large central vacuole, which are not present in animal cells. Virus cells are not considered living cells and are much simpler in structure, consisting of genetic material (DNA or RNA) surrounded by a protein coat. Animal cells have centrioles and lysosomes, which are not found in plant cells. Additionally, animal cells do not have a cell wall like plant cells do. Overall, each type of cell has unique components that contribute to their specific functions and characteristics.
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What are common cell components of muscle cells, gland cells, and absorbing intestinal cells?
Common cell components of muscle cells, gland cells, and absorbing intestinal cells include the cell membrane, cytoplasm, nucleus, and organelles such as mitochondria and endoplasmic reticulum. Muscle cells also contain specialized structures called myofibrils, which are responsible for muscle contraction. Gland cells contain secretory vesicles for releasing hormones or other substances. Intestinal cells have microvilli on their surface to increase the surface area for absorption, and they also contain specialized transport proteins for moving nutrients across the cell membrane.
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