1 / 6

The History of Life on Earth

Chapter 25. The History of Life on Earth. Questions prepared by William Wischusen Louisiana State University Michael Dini Texas Tech University. Why do some scientists believe that RNA, rather than DNA, was the first genetic material?.

juliannep
Download Presentation

The History of Life on Earth

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Chapter 25 The History of Life on Earth Questions prepared by William Wischusen Louisiana State University Michael Dini Texas Tech University

  2. Why do some scientists believe that RNA, rather than DNA, was the first genetic material? • RNA has both information storage and catalytic properties. • RNA contains uracil in place of thymine. • RNA could have evolved into DNA. • RNA can replicate more accurately than DNA. • All the protocells on early Earth contained RNA.

  3. Radiometric dating ____________. can be used to directly date fossils in sedimentary rock relies on the fact that the daughter isotope decays to the parent isotope at a constant rate allows us to indirectly date fossils up to billions of years old based on minerals in surrounding volcanic strata works only on rocks younger than 75,000 years allows us to determine an absolute, errorless date

  4. A, B, C B, C, A C, A, B A, C, B You discover three fossil organisms and want to determine their dates. You measure the percentage of carbon-14 (half-life 5,730 years) remaining in the fossils. Which of the following correctly places them in order from oldest to youngest?

  5. You discover a series of fossil organisms and want to determine their dates. You decide to use carbon-14 dating (half-life 5,730 years). Based on the table below, about how old are fossils A and B? 57,300 years 5,730 years 2,865 years 1,432 years other

  6. If the mitochondria and chloroplasts in eukaryotic cells resulted from endosymbiosis, what feature(s) might we expect these organelles to contain? a plasma membrane, DNA, and ribosomes a plasma membrane, nucleus, and ribosomes nucleus, DNA, and ribosomes a plasma membrane, nucleus, and cilia nucleus, ribosomes, and cilia

More Related