Lipids differ from other large biological molecules in that they _____.
A. are much larger
B. are not truly polymers
C. do not have specific shapes
D. do not contain carbon
E. do not contain nitrogen and phosphorus atoms
Ans: B. are not truly polymers
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Fluorescence occurs when
a. a high-energy electron returns to its ground state by releasing energy in a photon. b. a low-energy electron moves to a high-energy state by absorbing heat. c. a high-energy electron leaves its nucleus and moves to a different molecule. d. a pigment molecule accepts a high energy electron and releases a photon of energy e. the energy from an electron is transferred to a different molecule while the electron returns to the ground state.
The principle of comparative advantage holds that nations should
a. specialize in activities for which they have the lowest opportunity cost. b. strive to become self-sufficient in production. c. produce only goods and services for which they have absolute advantage. d. become less labor-intensive and more capital-intensive.
In an autosomal dominant disorder such as Huntington's disease, two carrier parents have the probability of passing
the gene onto ____ percent of their children.
a. 0 b. 25 c. 50 d. 75 e. 100
In a human, the ________ provide(s) a common passageway for both food and air
A) bronchioles B) trachea C) pharynx D) alveoli