Prokaryotes and Eukaryotes Cells
The article was added by Maria Ghenova at 03/08/2008.
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Mitosis versus Meiosis - ...generated during the S phase
of interphase. Mitosis, then, merely duplicates cells, the two daughter cells essentially clones of
the original cell. As such, mitosis occurs during growth and ...
Mutations - ...tide, backs up, and attaches a new
nucleotide. If a mismatch should escape the proofreading ability of the DNA polymerase, other,
mismatch repair, enzymes will correct the error. Repair mechanis...
Why Cells Divide - ...r than the surface area enclosing it. This is because volume
increases by the cube of the radius,
whereas the surface area increases by only the square of the radius. When the
...
Epistasis - ... of pigment produced or the color of
the pigment. If the first gene codes for no pigment, then the expression of the second gene has
no effect, regardless of the kind of pigmentation it enco...
Sex Linked Inheritance - ...Sex-linked (or X-linked) genes are genes that reside on the X, or sex, chromosome. Y-linked
genes are also possible, but since so few genes reside on the Y chromosome, Y-linkage...
Movement of Substances - ...>(such
as the plasma membrane). A selectively permeable membrane allows only specific substances
to pass.
2. The substance whose movement is being described may be water ...
Life at high temperatures - ... enzymes (Wharton, 2002). High temperatures may be dangerous
because they lead to the inactivation or even the denaturation of
enzymes, but they may also have damaging indirect effects by lea...
Ectotherms and endotherms - ...ve.
Terrestrial organisms, exposed to the sun and the air, are different
because they may acquire heat directly by absorbing solar radiation
or be cooled by the latent heat of evaporation ...
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