CAMPBELL BIOLOGY IN FOCUS-MOD.MASTERING
3rd Edition
ISBN: 9780135191811
Author: Urry
Publisher: PEARSON
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Textbook Question
Chapter 23, Problem 3TYU
A researcher discovers a fossil of what appears to be one of the oldest·known multicellular organisms. The researcher could estimate the age of this fossil based on
- A. the amount of uranium·238 in the fossil.
- B. the amount of carbon·14 in the fossil.
- C. the amount of uranium·238 in volcanic layers surrounding the fossil.
- D. the amount of carbon-14 in volcanic layers surrounding the fossil.
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Students have asked these similar questions
Which statement about spontaneous generation is false?
A.
It addresses the formation of living cells from previously nonliving material.
B.
This was a common belief for during the Middle Ages.
C.
Pasteur demonstrated that it does not occur under normal laboratory conditions.
D.
It occurs every time a new species evolves from a preexisting species.
E.
It apparently occurred at least once – when life on Earth began.
Which bits of evidence would convince you that life originated as early as 3.2 bya?
a. You look at a microfossil under a scanning electron microscope and it is the same shape as a cell.
b. A high-quality transmission electron micrograph of a fossil cell reveals cellular compartments, including a possible nucleus.
c. Potassium dating of a fossil containing a possible cell indicates that the fossil is 3.2 billion years old.
d. Using transmission and scanning electron microscopy, you find evidence of a carbon-based material in what appears to be a cell wall of a fossil isotopically dated as 3.2 billion years old.
Radioisotopes are useful in dating fossils and rocks because
a.
they are present in very high amounts.
b.
they decay rapidly.
c.
they decay in a predictable pattern over long time period.
d.
their rate of decay changes over time.
Chapter 23 Solutions
CAMPBELL BIOLOGY IN FOCUS-MOD.MASTERING
Ch. 23.1 - Describe an example from the fossil record that...Ch. 23.1 - Your measurements indicate that a fossilized skull...Ch. 23.1 - WHAT IF? What might a fossil record of life today...Ch. 23.2 - Explain the consequences of plate tectonics for...Ch. 23.2 - Prob. 2CCCh. 23.2 - What factors promote adaptive radiations?Ch. 23.2 - Prob. 4CCCh. 23.3 - Explain how new body forms can originate by...Ch. 23.3 - Why is it likely that Hox genes have played a...Ch. 23.3 - MAKE CONNECTIONS Given that changes in morphology...
Ch. 23.4 - How can the Darwinian concept of descent with...Ch. 23.4 - Prob. 2CCCh. 23 - Which factor most likely caused animals and plants...Ch. 23 - Adaptive radiations can be a direct consequence of...Ch. 23 - A researcher discovers a fossil of what appears to...Ch. 23 - A genetic change that caused a certain Hox gene to...Ch. 23 - A swim bladder is a gas-filled sac that helps fish...Ch. 23 - SCIENTIFIC INQUIRY Herbivory (plant eating) has...Ch. 23 - FOCUS ON EVOLUTION Describe how gene flow, genetic...Ch. 23 - FOCUS ON ORGANIZATION You have seen many examples...Ch. 23 - SYNTHESIZE YOUR KNOWLEDGE In 2010, the Soufriere...
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