What are the three general types of amino acids?
A) ? helices, ? sheets, and looped segments
B) covalent, noncovalent, and van der Waals forces
C) positive, negative, and noncharged
D) hydrophobic, polar (noncharged), polar (charged)
E) acidic, basic, and neutral
Answer: D
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Which species of Burkholderia is the one most commonly found in clinical specimens?
a. Burkholderia ralstonia b. B. pseudomallei c. B. mallei d. B. cepacia
The systems that support and move the body are
A. skeletal and muscular. B. nervous and endocrine. C. circulatory and respiratory. D. digestive and circulatory. E. urinary and immune.
While synthesizing a new blue pigment, a chemist notices that the new compound accumulates between an aqueous (water) environment and a hydrophobic environment
When added to a mixture of oil and water, the pigment creates a blue ring around the droplets of oil. Which of the following statements best describes this new pigment? A) The pigment is a polar molecule and is forming hydrogen bonds with both the water and oil molecules. B) The pigment is hydrophilic and will not form hydrophobic bonds with the oil. C) The pigment is amphipathic, having polar and nonpolar regions. D) The pigment is neither polar nor nonpolar; it is apolar. E) The pigment is probably hydrophobic and is attempting to bond with the oil.
What is typical osmolarity of body fluids in most freshwater invertebrates?
a. about 225 mOsm/L b. about 300 mOsm/L c. about 1000 mOsm/L d. about 1500 mOsm/L