Chargaff's first rule states that
a. the amounts of adenine and thymine are identical.
b. the DNA molecule is helical.
c. the DNA molecule contains deoxyribose.
d. the proportion of adenine and guanine differs between different species.
e. DNA exhibits a repeating pattern every 0.34 nm.
a
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Electrons fired in vintage TV tubes traveled at about 0.25 times the speed of light, having more momentum and energy than would be required classically to get that speed. Strictly speaking, this
A) increased your electric bill. B) decreased your electric bill. C) had no effect on your electric bill.
A succession of 2-m long water waves on a lake goes by a piece of floating cork that bobs up and down one complete cycle each second. What is the speed of the wave?
A) 0.25 m/s B) 0.50 m/s C) 1.0 m/s D) 2 m/s E) 4 m/s
A long straight wire (diameter = 2.0 mm) carries a current of 40 A. What is the magnitude of the magnetic field 1.5 mm from the axis of the wire?
a. 3.0 mT b. 12 mT c. 5.3 mT d. 7.4 mT e. 8.0 mT
There are samples of two different isotopes, X and Y. Both contain the same number of radioactive atoms. Sample X has a half-life half that of Y. How do their decay rates compare?
a. The rates of X and Y are equal. b. X has a greater rate than Y. c. The rate depends on atomic number, not half-life. d. X has a smaller rate than Y.