Which of the following is not a method of producing nuclear fusion?
a. heating a magnetically confined plasma
b. forcing nuclei together using lasers
c. cooling nuclei to very cold temperatures
d. forcing nuclei together with a nuclear fission explosion
C
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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
A sound wave in helium has an intensity of 
The density of helium is 0.179
and the velocity of sound in helium is 965 m/s. The pressure amplitude of the sound wave is
A. 
B. 
C. 
D. 
E. 
If gravity alone acts to retard the expansion and nothing acts to accelerate it, the Universe is said to be closed if I. gravity is strong enough to stop the expansion in a finite time. II. the density of the Universe is less than the critical density. III. the Universe is finite
a. I & II b. I & III c. II & III d. I, I, & III e. None of the other choices are correct.
Lipids are more commonly known as
A) enzymes B) sugars C) fats D) organic acids