An atom is best described as
A) having a nucleus containing protons and electrons.
B) always containing an equal number of protons and neutrons.
C) defined by its number of electrons.
D) defined by its atomic mass.
E) the smallest unit of an element.
Answer: E
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Darwin proposed that natural selection occurs in an environment by
A. producing a constant number of offspring while in that environment. B. surviving for a fixed amount of time. C. resisting the environment and keeping the environment from changing. D. favoring those individuals with the most favorable acquired characteristics. E. favoring heritable features that make the organism better suited to survive and reproduce.
What cultural trait is unique to hominins? What will be an ideal response?
Which cells secrete mucus?
A) type II alveolar cells B) ciliated cells C) alveolar macrophages D) type I alveolar cells E) goblet cells
What is meant by the "directionality" of the strands of a DNA molecule? Explain how this directionality is ultimately responsible for Okazaki fragments. What will be an ideal response?