Immune tolerance of some self antigens need only be maintained in the T cell population because certain B cells can't become activated without the help of T cells.
Answer the following statement true (T) or false (F)
True
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What structural component in skeletal and cardiac muscle conducts action potentials from the outer surface of the muscle fiber inside to the myofibrils?
A. transverse tubule B. actin C. troponin D. tropomyosin E. None of the answers are correct.
In the attempt to identify the remains thought to be that of Czar Nicholas Romanov II and his family, _____ was used
to determine that the skeletons were not only related members of a family, but were also related to living Romanov relatives. a. Y chromosome STR alleles b. blood typing c. facial reconstruction d. maternally inherited mitochondrial DNA e. paternally inherited mitochondrial DNA
The diffusion of water across a selectively permeable membrane is
What will be an ideal response?
One-thousandth of a meter is a
A. yard. B. millimeter (mm). C. micrometer (?m). D. nanometer (nm). E. centimeter (cm).