Which of the following are produced by roots in order to increase surface area, allowing for greater access to nutrients in the soil?
A. root hairs
B. root nodules
C. root parenchyma
D. root Casparian strips
A
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The clonal selection theory is an explanation for
A. how a single type of stem cell can produce both red blood cells and white blood cells. B. how antibody proteins can be molded to fit antigens after the antigen interacts with the antibody-producing type of cell. C. how an antigen can induce the multiplication of very few cells to result in production of high levels of specific antibodies. D. how HIV can disrupt the immune system. E. how macrophages can recognize specific T cells and B cells.
Red muscle fibers produce ATP mainly by aerobic respiration and their bright red color comes from ____
a. blood b. hemoglobin c. carbon dioxide d. sarcomeres e. myoglobin
Microbial diversity in humans
What will be an ideal response?
In chordates, which mesoderm structure forms during gastrulation and provides structural rigidity along the dorsal anterioposterior axis of the embryo?
A. neural tube B. archenteron C. notochord D. intestinal tract E. epidermis