A positive ion is formed when
a. a neutral atom gains an electron. b. a neutral atom loses an electron.
c. a negative ion loses an electron. d. all of the above
b
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DNA molecules cannot be altered by chance errors in reproduction
Indicate whether the statement is true or false
Place these waves in order from shortest wavelength to longest.
A. Light waves < ocean waves < sound waves B. Light waves < sound waves < ocean waves C. Sound waves < light waves < ocean waves D. Ocean waves < sound waves < light waves
The image produced by a single diverging lens will ALWAYS be
A. inverted and virtual. B. erect and real. C. erect and virtual. D. inverted and real. E. at infinity.
Why is it believed that life can not evolve on a planet that orbits a spectral type A, B or O star?
a. These stars produce too much infrared radiation which would destroy carbon-based organisms. b. These stars have very small life zones. c. These stars are not capable of producing planets. d. These stars do not remain on the main sequence long enough for life to evolve. e. These stars take too long to form.