A single human cell encloses about 1.5 meters of DNA containing 4.5 billion base pairs. How far apart are these base pairs in the DNA?
a. 3.3 x 10-10 nm
b. 3.3 x 1010 nm
c. 3 x 109 nm
d. 300 nm
e. 0.34 nm
E
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Galactic collisions mostly involve interactions between gas and dust clouds rather than individual stars
Indicate whether the statement is true or false
While Kuiper Belt bodies are often larger than any asteroid, we think their density will be lower due to presence of a lot of
A) hydrogen. B) methane. C) rock. D) ice. E) helium.
Living next to a lake near volcanic activity can be deadly. There can be large amounts of CO2 dissolved in the water. An earthquake, landslide, or even rapid cooling can trigger the release of the CO2, causing death nearby. The water of the lake in these cases is
a. an unsaturated solution. b. a saturated solution. c. a supersaturated solution. d. a completely unsaturated solution.
An important part of the history of our understanding of the atmospheric ozone layer was
A) satellite measurements that showed a dangerous build-up of ozone all over Earth. B) the discovery by Rowland and Molina that jet airplane exhaust is contributing to the greenhouse effect. C) the discovery by Susan Solomon that jet airplane exhaust is contributing to the greenhouse effect. D) the discovery by Rowland and Molina of a large ozone depletion over Antarctica. E) the discovery by Susan Solomon of a large ozone depletion over Antarctica.