In a sample of distilled water, a water molecule that has picked up an extra hydrogen ion is called a(n)
A. proteinaceous water molecule.
B. hydronium ion.
C. hydroxide ion.
D. amphipathic macromolecule.
Answer: B
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Billy is injured during a high school football game. His chest is badly bruised and he is experiencing difficulty in breathing. What might the problem be?
The primary function of the cardiovascular system is:
a. body temperature regulation b. transportation of materials c. regulation of the immune system d. none of the above
Together, the epithelium and the lamina propria of the respiratory tract constitute (a)
A) serous membrane. B) mucous membrane. C) synovial membrane. D) cutaneous membrane. E) All of the answers are correct.
Heme released from hemoglobin in aged red blood cells is decomposed in the liver into
A. iron and interleukins. B. iron and the bile pigment bilirubin, which is eventually converted to biliverdin. C. serum and plasma proteins. D. iron and the bile pigment biliverdin, which is eventually converted to bilirubin.