The two strands making up the double helix of DNA are said to be
A) paired
B) corresponding
C) matching
D) complementary
D
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Which of the following is NOT a property of elliptical galaxies?
A. They have little dust or cold gas. B. They have prominent spiral arms. C. They contain mostly old (Pop II) stars. D. Stars are distributed smoothly throughout their volume.
The figure below shows a planet traveling in a counterclockwise direction on an elliptical path around a star located at one focus of the ellipse. When the planet is at point A,
A. its speed is decreasing. B. its angular momentum is increasing. C. the gravitational force does no work on the planet. D. all of the above are correct. E. none of the above is correct.
The place the Sun stops its northward motion along the ecliptic is the:
A) equator. B) prime meridian. C) summer solstice. D) vernal equinox. E) node of the ecliptic.
The longest wavelengths of visible light are in the color
A. red. B. orange. C. green. D. blue. E. violet.