________ are lymphocytes that originate in the bone marrow but then mature in the thymus
Fill in the blank(s) with correct word
T lymphocytes
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The internal solute concentrations of osmoregulators are:
A. either higher or lower than the solute concentration of the external environment. B. similar to the solute concentration of the external environment. C. higher than the solute concentration of the external environment. D. lower than the solute concentration of the external environment. E. None of the answer options is correct.
At the time of the voyage of the H.M.S. Beagle, experienced sailors could easily identify a tortoise’s island of origin
by the ____, supporting Darwin's observation that animals on different islands varied slightly in form.
a. site it chose to breed b. shape of its shell c. color of its skin d. algae it chose to eat e. courtship it displayed
Which sequences would likely have both a nucleosome-depleted region (NDR) and a poly A/T tract to attract transcriptional activators to a transcription start sequence?
A) chromatin modifiers B) enhancers C) open promoters D) closed promoters E) insulators
The contractile vacuoles of protozoa are used for
a. Storing nutrients b. Maintaining optimal levels of water in the cell c. Production of toxins d. Motility