What are the "rungs" of a DNA spiral made up of?
a. RNA
b. four chemical bases arranged in pairs
c. enzymes
d. ribosomes
e. proteins
b
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When a hot object makes thermal contact with a cold object, the direction of
A) temperature is from hot to cold. B) internal energy flow is from hot to cold C) both of these D) neither of these
A liquid has an index of refraction of 1.33 . What is the speed of light through it? (c = 3.00 × 10^8 m/s)
a. 3.99 × 10^8 m/s c. 4.46 × 10^8 m/s b. 2.26 × 10^8 m/s d. 2.04 × 10^8 m/s
Pressure in a Liquid: The Tonga Trench in the Pacific Ocean is 36,000 feet deep. Assuming that sea water has an average density of 1.04 g/cm3, calculate the absolute (total) pressure at the bottom of the trench in atmospheres. (1.00 in = 2.54 cm, 1.00 atm = 1.01 × 105 Pa)
A. 1.1 × 103 atm B. 1.1 × 108 atm C. 1.1 × 105 atm D. 1.1 × 106 atm E. 2.1 atm
Waves that are emitted in phase from two sources will undergo constructive interference when the paths from the sources differ by
A) an odd half-integer number of wavelengths. B) a whole integer number of wavelengths. C) an odd one-third-integer number of wavelengths. D) any quarter-integer number of wavelengths. E) none of the above.