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Q. What are blood stem cells?
Stem cells are undifferentiated cells able to differentiate into other kinds of specialized cells.
The stem cells of the bone marrow originate the differentiated blood cells According to stimulus from specific growth factors the stem cells are turned into red blood cells, megakaryocytes and leukocytes (cells that form platelets). Research shows that stem cells of the bone marrow can also differentiate into muscle, hepatic cells and nervous.
Regulation of Respiration Whenever the need for oxygen in the body increases, ventilation of the respiratory organs also increases. In the same way whenever the level of oxyge
How are gametes formed in the pteridophyte life cycle, by mitosis or meiosis? What is the type of meiosis that occurs in pteridophytes? In pteridophytes gametes are made by mit
List the four basic points to be kept in mind when advising food exchange. To develop the food exchange list points to keep in mind are: a) Group similar foods in one group.
What is the control center of the cell? The nucleus contains DNA, which having the instructions for all the functions of the body.
Oligomeric enzymes Oligomeric proteins consist of two or more polypeptide chains, which are usually linked to each other by non-covalent interactions and never by peptide bonds
Water Cycle (Hydrological Cycle) The movement of water on the earth is continuous and forms many complex inter-related loops (Figure shown below). Cycling of water involves atm
What are the advantages of rationale for menu planning? Can you list a few of these? Well planning in advance helps to determine quantities of different foods accurately. Food
Explain the Classification of Malignant Tumors Malignant tumors can be classified as: Carcinomas: These tumors arise from the epithelial lining (the squamous cells) e.g. ski
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How does substrate concentration affect the initial rate of an enzyme- catalyzed reaction?
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