The mass number of an atom is determined by the combined masses of its ____.
A. neutrons and protons
B. neutrons and electrons
C. protons and electrons
D. protons, neutrons, and electrons
E. neutrons, nucleus, and electrons
Answer: A
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The loudest sounds a nurse hears while listening to a patient's heart through a stethoscope are caused by
A. closing of the AV valves. B. opening of the semilunar valves. C. depolarization of the ventricles. D. contraction of the atria. E. contraction of the ventricles.
Which of the following statements about molecular evolution is true?
A) Homologous genes often evolve in the same way. B) Different regions of the same gene evolve at different rates. C) Genes in the same organism evolve at about the same rate. D) Genes in different organisms evolve at about the same rate. E) Nucleotide substitutions are nonrandom.
The ability to control these processes may allow manipulation of an organism's cells or insertion of cells into an organism to allow the regrowth of damaged tissues and organs in humans.
A. vector and somatic cell transformation B. mitosis and meiosis C. determination and differentiation D. transformation and transduction
Although there are many distinct prokaryotic species, most have a small range of shapes, sizes, and growth rates. Which of the following characteristics are not observed in prokaryotes?
(a) a highly structured cytoplasm (b) endoplasmic reticulum (c) the ability to divide rapidly (d) a cell wall