Which of the following observations is consistent with the hypothesis that all life on Earth has a common ancestor?
A) different organisms use the same set of amino acids
B) different organisms use different sets of amino acids
C) all proteins are made of amino acids
D) some organisms don't use amino acids at all
A
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Radio maps of our galaxy show spiral arms because
a. the arms have larger Doppler shifts. b. the gas in the spiral arms is very hot. c. the dust in spiral arms is denser. d. the gas in spiral arms is denser. e. the stars in the spiral arms emit most of their energy at radio wavelengths.
Emission lines of hydrogen that are found in the ultraviolet part of the electromagnetic spectrum are formed by electrons transitioning from:
A) any level to level 2. B) level 2 to any level. C) any level to level 1. D) level 1 to any level. E) any level to level 3.
If a current of 2.4 A is flowing in a wire of diameter 2.0 mm, what is the average current density?
A) 7.6 × 105 A/m2 B) 5.2 × 10-6 A/m2 C) 1.9 × 105 A/m2 D) 3.6 × 105 A/m2 E) 21 × 10-6 A/m2
How much heat, in joules, is required to convert 1.00 kg of ice at 0°C into steam at 100°C? (Lice = 333 J/g; Lsteam = 2.26 × 10^3 J/g.)
a. 3.35 × 10^5 b. 4.19 × 10^5 c. 2.36 × 10^6 d. 2.69 × 10^6 e. 3.01 × 10^6