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where are embryonic stem cells found, how are they harvested? where are adult stem cells found, how are they harvested? references?
Embryonic stem cells were found in the blastocyst. Theyare harvested from the inner cell mass of the blastocyst. Adult stem cells werefound in blood, central and spinal brain, liver, pancreas,...
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Cleavage is chick is called discoidal type? Why.
Division of chicken egg cell is not equal. Fat is accumulated at one pole of the cell (called vegetative pole) and it makes cytoplasm divisions at that region impossible. Cytoplasm...
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1. Explain how sampling methods are used in ecological studies
2. Explain the ethical issues related to human cloning and using embryonic stem cells
1. In ecological studies, sampling methods are used in three ways: random sampling (large numbers of samples are taken from different points of the habitat), systematic sampling (samples are taken...
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short notes on cell signaling during embryonic development
Cells in the developing embryo are in constant communication with their neighbors, and the molecules they use to send and receive signals are essential for normal embryogenesis. Several intracellular signaling pathways have been identified, some of which are activated in response to secreted growth factors.
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How do embryonic cells communicate with each other? a. direct contact b. the release of chemicals c. hormones d. all of the above Explanation!
d. all of the aboveThere are three different types of basic cell communication: surface membrane to surface membrane; exterior, which is between receptors on the cell; and direct communication, which...
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Is it more detrimental to have an extra copy of a large chromosome or an extra copy of a smaller chromosome?
Yes Chromosomal abnormalities can have many different effects, depending on the specific abnormality. For example, an extra copy of chromosome 21 causes Down syndrome (trisomy 21). Chromosomal abnormalities can also...
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the process of inspiration occurs as a)lungs pull air inside b) passive expansion of air take place c)passive transport of air take place d) air is pushed inside
a)lungs pull air inside
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Are morphogenetic movements restricted to gastrulation only or does it happen through out the embryonic development?
Morphogenetic movements relate not only to gastrulation, but to embryonic development too. Morphogenetic movement in the early embryo takes place mainly through the movement and deformation of the epithelial cells,...
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Explain how one can distinguish between 18 -and 24-hours chick embryo
CHICK EMBRYO AT 24 HOURSNEURALFOLDS: On either side of mid dorsal line the ectoderm becomes thick.GUT: At this incubation stage foregut is formed.MESODERM: It is present between ectoderm and endoderm.BLOOD...
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What are the three sets of paired veins present in the early embryonic stage of vertebrates?
the vitelline, umbilical and cardinal veins
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