Which of the following is not related to the other four?
a. amino acids
b. nucleotides
c. five-carbon sugars
d. phosphate groups
e. nitrogenous bases
a
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A solid has a solubility at room temperature of 78 grams per liter. If 1.0 L of a hot solution containing 100. g of solute is cooled to room temperature, how much solid is formed?
A) 22 g B) 100 g C) 78 g D) 1 L E) 78g/L
The interstellar medium is composed of mainly _____
a. equal parts of gas and dust b. mostly dust and some gas c. mostly gas and some dust d. dust only e. gas only
Two strings on a violin are stretched between two points 20.0 cm apart. The mass per length of the strings are the same. If the ratio of the frequencies of the fundamental modes is 1.5 to 1.0, then what is the ratio of the tensions in the strings?
A. 1.75 B. 1.88 C. 1.00 D. 1.25 E. 1.50
Which of the following statements about electromagnetic waves in free space are true? (There could be more than one correct choice.)
A) The higher-frequency waves have shorter wavelengths than the lower-frequency waves. B) The higher-frequency travel faster than the lower-frequency waves. C) The wavelengths of the visible waves are some of the longest electromagnetic waves. D) The wavelengths of the visible waves are some of the shortest electromagnetic waves. E) The electric field vector is always at right angles to the magnetic field vector.