Radioisotopes carbon 14 dating pathway
Radioisotopes carbon 14 dating pathway - ri dating service matchmaking
44) If a particular marine organism is fossilized in the sediments immediately overlying the igneous rock at the arrow labeled “II,” at which other location, labeled A—E, would a search be most likely to find more fossils of this organism?A) B only B) C only C) D only D) B and C E) C and D The figure represents a cross section of the sea floor through a mid-ocean rift valley, with alternating patches of black and white indicating sea floor with reversed magnetic polarities.
E) the endosymbiotic origin of mitochondria and chloroplasts.8) Several scientific laboratories across the globe are involved in research concerning the origin of life on Earth.At the arrow labeled “III,” however, the igneous rock is about 1 million years old, and potassium-40 dating is typically used to date such rocks.Note: The horizontal arrows indicate the direction of sea-floor spreading, away from the rift valley.9) If natural selection in a particular environment favored genetic systems that permitted the production of daughter “cells” that were genetically dissimilar from the mother “cells,” then one should expect selection for which of the following? polynucleotide polymerase with low mismatch error rates II.polynucleotide polymerases without proofreading capability III. batteries of efficient polynucleotide repair enzymes IV.D) Early Earth’s atmosphere had significant quantities of ozone.3) What is true of the amino acids that might have been delivered to Earth within carbonaceous chondrites?
A) They had the same proportion of L and D isomers as Earth does today. formation of DNA-based genetic systems A) I, II, III, IV B) I, III, II, IV C) II, III, I, IV D) II, III, IV, I5) Which of the following is a defining characteristic that all protobionts had in common?uncertainty about which gases comprised early Earth’s atmosphere A) 1 only B) 2 only C) 1 and 2 D) 1 and 3 E) 2 and 32) How were conditions on the early Earth of more than 3 billion years ago different from those on today’s Earth?A) Only early Earth was intensely bombarded by large space debris. C) Less ultraviolet radiation penetrated early Earth’s atmosphere.A) There are no fossils in geological strata that are older than the Cambrian explosion. origin of fungal-plant symbioses A) 4, 3, 2, 1, 5 B) 4, 1, 2, 3, 5 C) 4, 1, 3, 2, 5 D) 4, 3, 1, 5, 2 E) 4, 3, 1, 2, 519) If it were possible to conduct sophisticated microscopic and chemical analyses of microfossils found in 3.2-billion-year-old stromatolites, then one should be surprised to observe evidence of which of the following within such microfossils? 41) Several scientific laboratories across the globe are involved in research concerning the origin of life on Earth. At the arrow labeled “III,” however, the igneous rock is about 1 million years old, and potassium-40 dating is typically used to date such rocks. At the arrow labeled “I” (the rift valley), the igneous rock of the sea floor is so young that it can be accurately dated using carbon-14 dating.B) Only the fossils of microorganisms are found in geological strata older than the Cambrian explosion. Which graph below, if the results were produced abiotically, would have the greatest promise for revealing important information about the origin of Earth’s first genetic system? Note: The horizontal arrows indicate the direction of sea-floor spreading, away from the rift valley. At the arrow labeled “III,” however, the igneous rock is about 1 million years old, and potassium-40 dating is typically used to date such rocks.E) It includes a series that shows the gradual change of scales into fur.14) If a fossil is encased in a stratum of sedimentary rock without any strata of igneous rock (for example, lava, volcanic ash) nearby, then it should be A) easy to determine the absolute age of the fossil, because the radioisotopes in the sediments will not have been “reset” by the heat of the igneous rocks. C) He would have placed them in more species than modern botanists do. It, and the loss of limbs by snakes, are an example of similar adaptations to a similar environment. A) species selection B) uniformitarianism C) sexual selection D) convergent evolution39) The existence of evolutionary trends, such as increasing body sizes among horse species, is evidence that A) a larger volume-to-surface area ratio is beneficial to all mammals. C) evolution always tends toward increased complexity or increased size.