51. The early atmosphere of Earth consisted mainly of (Points : 1.25) hydrogen,

Question

51. The early atmosphere of Earth consisted mainly of (Points : 1.25)        hydrogen, oxygen, and carbon dioxide.
       oxygen, water vapor, and carbon monoxide.
       water vapor, nitrogen, and carbon dioxide.
       hydrogen, carbon monoxide, and nitrogen.
       water vapor, hydrogen, and carbon dioxide. Question 52.52. Which piece of evidence would strongly support the RNA-first hypothesis? (Points : 1.25)        finding a protocell that could carry on metabolism as well as reproduce
       discovering a way to make RNA more stable than DNA
       finding a mechanism whereby proteins could assemble DNA out of free nucleotides
       being able to build microspheres that contain only protein and RNA
       finding a living organism that uses RNA as its genetic material Question 53.53. There are two important aspects to biological evolution: descent from a common ancestor and the fossil record. (Points : 1.25)        TRUE
       FALSE Question 54.54. Jean-Baptiste Lamarck's process of acquired characteristics would support the idea that if you run marathons and develop very strong leg muscles your children would be born with very strong leg muscles. (Points : 1.25)        TRUE
       FALSE Question 55.55. Miller's experiment showed that life could arise via chemical evolution. (Points : 1.25)        TRUE
       FALSE Question 56.56. Both the RNA-first and the protein-first hypotheses must propose a manner for DNA to become the genetic material as it is today. (Points : 1.25)        TRUE
       FALSE Question 57.57. The flipper of a whale and the wing of a bird are homologous structures. (Points : 1.25)        TRUE
       FALSE Question 58.58. Biological evolution is the process whereby (Points : 1.25)        humans descended from apes.
       species change through time.
       living cells arose from nonliving chemicals.
       prokaryotic cells became eukaryotic cells.
       only the strongest survive. Question 59.59. What evidence contributed to the formulation of the RNA-first hypothesis? (Points : 1.25)        RNA was formed in MIller's experiment.
       RNA continues to evolve chemically today.
       More primitive cells, such as archaea, use an RNA only information system.
       RNA can sometimes be both a substrate and an enzyme during RNA processing.
       Protocells contain only RNA and lipids. Question 60.60. The fact that marsupials are not as diverse in South America as they are in Australia would be classified as what type of evidence for evolution? (Points : 1.25)        biogeographical
       anatomical
       biochemical
       fossil record
       molecular evidence Question 61.61. The atmosphere would be considered what component of a chemical cycle? (Points : 1.25)        reservoir
       exchange pool
       biotic community
       source
       none of these 51. The early atmosphere of Earth consisted mainly of (Points : 1.25)        hydrogen, oxygen, and carbon dioxide.
       oxygen, water vapor, and carbon monoxide.
       water vapor, nitrogen, and carbon dioxide.
       hydrogen, carbon monoxide, and nitrogen.
       water vapor, hydrogen, and carbon dioxide.

Explanation / Answer

51-  water vapor, nitrogen, and carbon dioxide

52.52 -  finding a mechanism whereby proteins could assemble DNA out of free nucleotides

52.53- true

52.54 - true

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