Different types of living matter often have different forms of the same elements in their bodies. For example, the nitrogen in an animal often has a slightly different atomic structure than the nitrogen in a plant
Recently, nutritionists have discovered how to deduce the diets of various animal species by examining the type of nitrogen (and other elements) inside their bodies.
What is the chemical basis behind this scenario?
A) Radioactive elements can be used to trace the paths of molecules through the body.
B) Antioxidants buffer the potential damage that free radicals do to cells.
C) Covalent bonds result when two atoms share electrons.
D) Hydrophobic interactions keep water molecules from forming bonds with fats and oils.
E) Isotopes of the same element have the same atomic number but different atomic masses.
E
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The Bohr shift on the oxygen-hemoglobin dissociation curve is produced by changes in _____
A) the partial pressure of oxygen B) the partial pressure of carbon monoxide C) hemoglobin concentration D) temperature E) pH
Gram-negative diplococci are isolated from a genital specimen and yield the following results: • Glucose: positive • Maltose: negative • Lactose: negative The organism can be identified as:
a. N. gonorrhoeae. b. Neisseria meningitidis. c. Neisseria lactamica. d. M. catarrhalis.
Most O2 is transported in the blood
a. dissolved in the plasma. b. as bicarbonate ions. c. bound to hemoglobin. d. as carbon dioxide. e. bound to bicarbonate ions.
When a person is tested for HIV, the test is considered positive if _______ to the HIV are present.
A. bacteria B. antigens C. antibodies D. T-cells E. natural killer cells