Explain the structure and functions of the arteries
What will be an ideal response?
Arteries are blood vessels that move blood away from the heart; they usually carry oxygenated blood. Pulmonary arteries are an exception to this pattern; they carry deoxygenated blood. The arteries have thick walls made up of an outer connective tissue layer, a middle layer of elastic fibers and smooth muscle, and an inner layer of endothelium.
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The more a sample can be diluted and yet still react with antigen, the ______ the concentration of antibodies in that sample and the _______ is its titer.
A.) lower; lower B.) higher; lower C.) lower; higher D.) higher; higher
Some protists use multiple fission (cell division preceded by several nuclear divisions) as a means of reproduction. Multiple fission is also referred to as
A. budding. B. syngamy. C. intermediary meiosis. D. schizogony. E. zygotic meiosis.
Imagine that 1 milliliter of an experimental drug diluted in a saline solution is injected into 20 pregnant mice to determine possible side effects. Which of the following is a suitable control for this experiment?
A) 20 pregnant mice injected with 1 milliliter of saline B) 20 male mice injected with 1 milliliter of saline C) 20 non-pregnant mice injected with 1 milliliter of the drug D) 20 male mice injected with 1 milliliter of the drug E) 20 pregnant mice injected with 2 milliliters of the drug
Which of the following forms of energy is NOT one of those thought to have been involved in the production of large organic molecules in the primitive reducing atmosphere?
A. radioactivity B. electrical energy C. heat D. radiation from the sun E. sound