BELK SCIENCE F/LIFE-MASTRG. BIOL.AC+EBK
6th Edition
ISBN: 9781323907634
Author: BELK
Publisher: PEARSON
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Chapter 11, Problem 2LTB
Summary Introduction
Introduction:
The determination of the date when an ancient organism lived can be estimated through the age of the rocks. Radiometric dating depends on radioactive decay, as the rocks spontaneously break down into different unique elements as daughter products.
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In radiometric dating, scientists use the half-life of a radioactive isotope, to determine the approximate age of rocks, and the fossils that are embedded in them. Half-life is the time it takes for half of a radioactive element to become stable.Uranium 238 (238U) is a radioactive element that decays into Lead (206Pb) after 4.5 billion years.
6) Scientists found a fossil in a layer of rock that tested as 1/8th U and 7/8th Pb. What is the approximate age of the fossil?
A) 562 million years old
B) 4.5 billion years old
C) 9 billion years old
D) 13.5 billion years old
Not Graded
Radiometric dating measures the decay of radioactive isotopes present in layers where fossils
are found.
True
False
Radiometric decay of carbon-14 would be used in dating
sedimentary rock.
a trace fossil.
an insect in amber.
a fossil imprint.
igneous rock.
Chapter 11 Solutions
BELK SCIENCE F/LIFE-MASTRG. BIOL.AC+EBK
Ch. 11 - What observations did Darwin make on the Galapagos...Ch. 11 - Prob. 2LTBCh. 11 - Prob. 3LTBCh. 11 - In science, a theory is a(n) ___________. educated...Ch. 11 - The theory of common descent states that all modem...Ch. 11 - Prob. 6LTBCh. 11 - Prob. 7LTBCh. 11 - Even though marsupial mammals give birth to live...Ch. 11 - Prob. 9LTBCh. 11 - Which of the following taxonomic levels contains...
Ch. 11 - Prob. 1AAATBCh. 11 - DNA is not the only molecule that is used to test...Ch. 11 - Look at the tree you generated for question 2. It...Ch. 11 - Search for the biology learning standards...Ch. 11 - Humans and chimpanzees are more similar to each...Ch. 11 - The science that you learned in this chapter has...
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- True or false? Wrinkly textures in rock that formed from ancient biofilms living in marine sediments are considered trace fossils.arrow_forwardWhy is it so important to learn about the Piltdown Hoax? Do you think it demonstrates that scientists may lose their objectivity when they want data to fulfill their expectations and desires or does it demonstrate the self-corrective nature of science? Why were people so willing to believethat one of the oldest specimens was found in south England?arrow_forwardConsider three important fossil SITES in Canada. Name them. Put them in order from the oldest to the youngest. For each site, provide one phrase that captures the significance of the site.arrow_forward
- Organism A lived from 410 to 60 million years ago. Organism B lived from 200 to 100 million years ago. Which organism will be the better index fossil? (1)arrow_forwardWhich of the following is an accurate point that supports the idea that the earliest protocells relied first on RNA (not DNA) as inherited information? A. RNA is composed of lipids, and lipids were present on early Earth before the nucleotides that compose DNA were B. RNA is a monomer (unlike DNA), so it is simpler and more likely to have been used by these simple protocells C. DNA would have been too large to fit into the small protocells, but RNA was small enough to fit D. RNA can serve dual roles as both genetic information storage and an enzyme (but DNA cannot do both) ..arrow_forwardWhen a radio-isotope in a fossil with a half-life of 4,000 years has been reduced to 25% of its original amount, how old is the fossil?arrow_forward
- A fossil is found to contain the radioactive parent and daughter isotopes uranium 235U, and lead 207Pb, in the ratio 12.5% to 87.5%. Assuming that no 207Pb was present when the fossil first formed, estimate the age of this sample.Please show some thought process and a therefore statement. Thank you very much, have a great day!arrow_forwardAn organism dies,and its body leaves an impression in mud. Over time, the mud hardens into rock, and the impression becomes a fossil. Which kind of fossil was formed? A) cast B) mold C) original material D) trace fossilarrow_forwardwhat is a mold? A. the imprints from an organism can be a shell or the skin of an animal B. Molds fill in with sediment that hardens into rock. C. naturally preserved remains D. Organisms preserved in materials such as amberarrow_forward
- Mitochondria and chloroplasts contain some DNA, which more closely resembles prokaryotic DNA than (eukaryotic) nuclear DNA. Use this information to suggest how eukaryotes may have originated.arrow_forwardChoose the best answer. Fossils found further down in a layer of rock are most likely Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a more recent. b more ancient. C from strata closer to the Earth's surface. d associated with a single taxon.arrow_forwardWhat is the difference between Fossils and Trace Fossils.arrow_forward
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