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The general mechanism of RNA synthesis by these eukaryotic RNA polymerases is the same as for the prokaryotic enzyme that is:
? The initiation of RNA synthesis by RNA polymerase is directed through the presence of a promoter site on the 5' side of the transcriptional start site;
? The RNA polymerase transcribes one strand, the antisense (-) strand of the DNA sample;
? RNA is synthesis that does not require a primer;
a) Why is it significant that ions being transported across a cell membrane be shielded from the interior of the lipid bilayer? b) Why is photosynthesis referred to as
How does the structure of a chloroplast enable it to build up a concentration gradient of protons? Chloroplasts have an inner membrane system having of thylakoids. The pumpin
state 5 advantages and disadvantages of protozoa
MYCOPLASMOSIS Mycoplasma organisms are the smallest free living, lack of cell-wall and bounded by a triple layer of plasma membrane. The organisms are pleuomorphic in shape, viz.
M yc ot o xi c osi s There are several types of mycotoxins (toxins produced by the fungi) e.g. aflatoxin, ochratoxin etc. Many species of fungi produce them but Aspergi
Q. Which are the glands present in the epidermis of birds, reptiles and mammals? In the epidermis of reptiles and birds there are practically no glands. In mammals there are se
Q. How are the three major arthropod classes characterized according to the presence of wings? Arachnids and Crustaceans do not have wings. Most insects have wings.
Q. Is reproduction in sponges asexual or sexual? Reproduction in sponges can be asexual by budding, fragmentation or gemmation (regeneration) or sexual with larval stage a cili
Explain about the Incidence of defects in color vision Defects in colour vision can either be congenital or acquired. Males are more affected than females. Out of the populatio
Heterochromatin: Compact, gene-poor areas of a genome, which are enriched in the simple sequence repeats. As it may be impossible to clone, heterochromatin is generally ignored wh
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