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What are blood stem cells?
Stem cells are undifferentiated cells able to distinguish into other types of specialized cells.
The stem cells of the bone marrow create the differentiated blood cells. According to stimulus from specific growth factors the stem cells are turned into red blood cells, leukocytes and megakaryocytes (cells that form platelets). Research shows that stem cells of the bone marrow can also distinguish into muscle, nervous and hepatic cells.
Explain the Kidney Structure in human biology? The body's two kidneys are located in the small of the back, one behind the stomach and one behind the liver. Each kidney is comp
An mRNA molecule codifies only one type of protein? Eukaryotic cells have monocistronic mRNA, i.e., every mRNA codifies only one polypeptide chain. Prokaryotes can present poly
Q. What is Peaked T-Waves? Exercise induced increase in T-wave amplitude in V2 is quite predictive of anterior wall ischaemia (specificity = 95 percent). It appears that this m
Q. What are the problems that vertebrates needed to solve to adapt to the terrestrial environment since they came from the aquatic habitat? How evolution does solve those problems?
Producers Autotrophs (self-nourishing) are green plants as they synthesise carbohydrates from simple inorganic raw materials like carbon dioxide and water in the presence of su
Water Adaptations After becoming familiar with the two kinds of water stresses you would like to know about the adaptations in plants and animals which enable them to survive u
EPIDERMIS - Ectodermal in origin. Outer part of skin. Made up of stratified epithelium. Branches of sensory nerves present. More branches on lips, tips of fingers. B
Two chromosomes in a cell have identical length and centromere position yet are not homologous, what is different about them.
Q. How Genes can be exchanged between chromatids? When two homologous chromosomes physically exchangecorresponding segments during prophase I of meiosis, geneticists call it cr
Yesterday, when Eric returned home from jogging, he was breathing heavily, sweating profusely, and complained that his legs ached and felt weak. He took a drink of Gatorade and too
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