The RDAs are considered to be adequate to meet the known nutritional needs of
What will be an ideal response?
nearly all healthy persons.
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In moving a molecule of oxygen from the air to a muscle cell, which organ system(s) is(are)
involved?
a. respiratory b. circulatory c. nervous d. all of these
After the blood leaves the glomerular capillaries, it goes via the efferent arterioles to the
a. renal vein. b. renal artery. c. peritubular capillaries. d. vena cava. e. heart.
Everyone is exposed regularly to ionizing radiation found in the soil, water, and air and from cosmic rays. In fact, 80% of the ionizing radiation people are exposed to comes from naturally occurring sources. Ionizing radiation can cause double-strand breaks in the DNA. Often, the DNA breaks have missing nucleotides at the broken ends. What type of repair would likely be used, and what would be the result of repairing this type of damage?
A. Direct repair would be used and would lead to properly repaired DNA. B. Direct repair would be used to join the DNA, but errors would still remain. C. Nonhomologous end joining would be used and would lead to properly repaired DNA. D. Nonhomologous end joining would be used to join the DNA, but errors would still remain.
A recent book by a reputable biologist suggests there is a deep, hot biosphere under the earth's crust that may have more biomass than all life at the earth's surface. This would primarily rely on what organisms?
A. primitive animals B. primitive heat-loving plants C. fungi living on the detritus from above D. thermoacidophilic archaea E. viruses