35.All life on Earth is based on carbon chemistry.36.The DNA molecules contain six different bases.37.DNA molecules cannot be altered by chance errors in reproduction.38.The oldest... Solved Astronomy 6 Views Bookmark
29.The portion of the electromagnetic spectrum between the 21 cm line of neutral hydrogen and the 18 cm line of OH is known as the... Solved Astronomy 5 Views Bookmark
21.The oldest fossils on EarthA.show that life began in Africa.B.show that life began in lush regions between large rivers.C.show that life began in the oceans.D.are... Solved Astronomy 5 Views Bookmark
11.Current searches for extraterrestrial intelligence use radio telescopes at wavelengths A.which must be shorter than the local wavelengths emitted by Earth’s atmosphereB.which must be longer... Solved Astronomy 6 Views Bookmark
1.A cell's DNA molecules are constructed ofA.amino acids.B.proteins.C.sugars, phosphates, and bases.D.all of the aboveE.none of the above 2.DNA molecules contain patterns for the production ofA.proteins.B.amino acids.C.phosphates... Solved Astronomy 5 Views Bookmark
47.The night sky is dark because the universe is not infinitely old.48.The cosmological principle states that any observer in any galaxy will see the same... Solved Astronomy 6 Views Bookmark
42.The ____________________ is that the universe is both isotropic and homogeneous. 43.The ____________________ are theories that unify the electromagnetic, weak and strong forces at extremely high... Solved Astronomy 5 Views Bookmark
31.The flatness problem states thatA.the density of the universe is very close to the critical density.B.the density of the universe is much larger than the... Solved Astronomy 6 Views Bookmark
21.The cosmic background radiation comes from a time after the origin of the universeA.when protons and neutrons were first formed.B.when the big bang first began... Solved Astronomy 5 Views Bookmark
11.Space-time will be flat ifA.the universe is expanding.B.the universe is accelerating.C.the average density of the universe is equal to the critical density.D.the universe is finite.E.the... Solved Astronomy 5 Views Bookmark
1.The resolution of Olbers' paradox suggests that it gets dark at night becauseA.the universe is not infinite in age.B.the universe is static.C.the universe is closed.D.a... Solved Astronomy 6 Views Bookmark
103.The Large and Small Magellanic clouds are satellites galaxies of the Milky Way.104.Elliptical galaxies are primarily made up of massive O and B stars.105.The Local... Solved Astronomy 6 Views Bookmark
93.Elliptical galaxies contain more gas, dust and young stars than do Sa galaxies.94.Until recently, most astronomers thought elliptical galaxies were shaped like oblate spheroids.95.Cepheid variable... Solved Astronomy 6 Views Bookmark
82.The units on the Hubble constant are ____________________. 83.____________________ clusters of galaxies contain closely spaced galaxies and often contain giant elliptical galaxies and a hot intergalactic... Solved Astronomy 6 Views Bookmark
71.If Hubble's constant is taken to be 70 km/sec/Mpc, and a quasar is found with a radial velocity of 0.95 times the speed of light,... Solved Astronomy 6 Views Bookmark
61.What was the first evidence that quasars were different from astronomical objects before they were observed in visual wavelengths?A.The first quasars were seen to have... Solved Astronomy 6 Views Bookmark
51.The fact that many radio lobes emit more intensely from the side away from the galaxy suggests that...A.they are formed by material falling into the... Solved Astronomy 5 Views Bookmark
41.What distance method did Edwin Hubble use to determine the distance to local galaxies?A.Hubble LawB.Supernova observationsC.Period-luminosity relationship of variable starsD.Parallax 42.What distance methods is used to... Solved Astronomy 6 Views Bookmark
31.The Virgo clusterA.is the galactic cluster that contains the Milky Way.B.is the oldest known cluster of galaxies.C.is located at the center of the universe.D.contains mostly... Solved Astronomy 5 Views Bookmark
21.Based on the galaxies found in the Local Group of galaxies, the most common type of galaxy in the universe is expected to beA.the spiral... Solved Astronomy 5 Views Bookmark
11.A ____ generally contains well over 1000 galaxies and is quite dense. They often contain many giant elliptical galaxies.A.local groupB.poor clusterC.rich clusterD.tidal tailE.quasar 12.The Milky Way... Solved Astronomy 6 Views Bookmark
1.An E galaxy containsA.mostly lower-main sequence stars and giants.B.mostly upper main sequence stars and giants.C.mostly upper main sequence stars and gas and dust.D.roughly equal numbers... Solved Astronomy 6 Views Bookmark
45.The center of our galaxy is located in the direction of the constellation of Orion.46.Shapley found the distance to the center of the galaxy by... Solved Astronomy 5 Views Bookmark
38.The center of our galaxy is believed to be occupied by the radio source known as ____________________.or 39.The ____________________ of the galaxy contains population I stars,... Solved Astronomy 6 Views Bookmark
31.Which of the following can't be associated with the spiral arms of a galaxy?A.Dust and gasB.Metal poor starsC.Young, massive starsD.Star formation 32.How did Harlow Shapley determine... Solved Astronomy 5 Views Bookmark
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