Foreign cells that enter the human body have unique cell surface proteins, known as ________, which stimulate the body's defense to attack
A) leukocytes
B) Rh factors
C) antibodies
D) platelets
E) antigens
E
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____ bacteria are found inside the roots of legumes, where they receive _____ from the host plant
a. Thermophilic; water b. Cyanobacteria; minerals c. Nitrogen-fixing; carbohydrates d. Methane-producing; minerals e. Halophilic; carbohydrates
The following statements describe how cancer is staged. Which of the statements is true?
A. Most cancers are grouped into stages 1-4; however, treatment options are only available for stages 1-3. B. Once a cancer reaches each stage, it cannot be reversed, as tumors only grow in size, even with aggressive treatments. C. Cancer is described based on the size of the tumor, if the tumor has invaded nearby tissues, if it has spread to lymph nodes, and if it has moved to other organs of the body. D. Cancer is described by ten stages, each with their own subdivisions. The lower the stage, the worse the prognosis.
An erection of the penis results most directly from:a
the bone present in the penis. b. dilation of the veins leading from the penis. c. contraction of the muscles within the penis. d. dilation of the arteries in the penis. e. a blocking of enzymes within the penis.
A scientist conducts experiments to test a(n) (observation/hypothesis/theory)
What will be an ideal response?