what does the T Regulator Cell (TR) do?
What will be an ideal response?
prevents cell subtypes from proliferating against self antigens
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Dyes are usually added to sections of biological specimens to increase
(a) resolving power. (b) magnification. (c) contrast. (d) all of the above.
Soon after the introduction of antibiotics, resistant strains of bacteria that could grow in the presence of particular antibiotics began to evolve. Researchers develop new antibiotics, only to see resistant bacterial strains evolve within a few years. Which of the following explains why resistant strains of bacteria can evolve so quickly?
A. Bacteria have a short generation time. B. Bacteria can transfer plasmids containing resistance genes via conjugation. C. Horizontal gene transfer. D. Bacteria have a short generation time and can transfer plasmids containing resistance genes via conjugation. E. Bacteria have a short generation time and can transfer plasmids containing resistance genes by horizontal gene transfer mechanisms such as conjugation.
Ischemia in the heart often leads to angina pectoris, which is ____
Fill in the blank(s) with the appropriate word(s).
Which statement is true of mitosis and cytokinesis in normal tissues?
A) Cytokinesis occurs simultaneously with mitosis. B) Cytokinesis precedes mitosis. C) Mitosis precedes cytokinesis. D) Cytokinesis partially overlaps with mitosis.