________ is a human hereditary disease that is caused by a dominant allele but does not show up in affected individuals until they are in middle age.
A. Tay-Sachs disease
B. Hemophilia
C. Huntington's disease
D. Cystic fibrosis
E. Sickle cell anemia
Answer: C
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Which of the following statements is FALSE?
A. Chemical reactions proceed more quickly at higher temperatures. B. Chemical reactions progress at a faster rate when the reacting particles are present in higher numbers. C. Larger particles move faster than smaller ones and thus collide more frequently and more forcefully. D. Catalysts increase the rate of chemical reactions, sometimes while undergoing reversible changes in shape.
The eastern meadowlark and the western meadowlark are two bird species that look very similar to each other. Why do biologists not consider them the same species?
A. The two species experience the reproductive barrier of habitat isolation. B. Species are not determined by appearance but by their ability to interbreed naturally. C. The two species do not live in the same habitat and thus do not interbreed in nature. D. All of the above are correct.
The basic unit of a DNA molecule is the
A. nitrogenous base. B. sugar-phosphate backbone. C. amino acid. D. nucleotide. E. ribose sugar.
Which statement accurately describes the properties of sound?
A. The frequency of a sound determines the loudness. B. The amplitude of a sound determines its pitch. C. The amplitude of a sound is the number of waves per second. D. A soft sound has a greater amplitude than a loud sound. E. A high note and a low note with the same amplitude are equally loud.