Campbell Biology in Focus (2nd Edition)
2nd Edition
ISBN: 9780321962751
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece
Publisher: PEARSON
expand_more
expand_more
format_list_bulleted
Concept explainers
Videos
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.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
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.
Martian meteorites found in Antarctica were determined to possibly contain life. Scientists looked skeptically at these meteorites because
a.
their results suggest unusual chemical signatures that do not indicate life.
b.
features thought to be Martian fossils could be nonbiochemical formations.
c.
it is impossible for a piece of the Martian surface to fall to Earth.
d.
both a and b are true.
Chapter 23 Solutions
Campbell Biology in Focus (2nd Edition)
Ch. 23.1 - Your measurements indicate that a fossilized skull...Ch. 23.1 - Describe an example from the fossil record that...Ch. 23.1 - WHAT IF? What might a fossil record of life today...Ch. 23.1 - Prob. 4CCCh. 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...
Additional Science Textbook Solutions
Find more solutions based on key concepts
Figure 1.18 In the example below, the scientific method is used to solve an everyday problem. Which part in the...
Concepts of Biology
How does trandlation differ from transcription?
Microbiology: Principles and Explorations
Why are mutants used as test organisms in the Ames test?
Laboratory Experiments in Microbiology (11th Edition)
Some people consider Pasteur or Koch to be the Father of Microbiology, rather than Leeuwenhoek. Why might they ...
Microbiology with Diseases by Body System (4th Edition)
Match the people in column A to their contribution toward the advancement of microbiology, in column B. Column ...
Microbiology: An Introduction (13th Edition)
Propose a model for the assembly of a flagellum in a typical Gram-positive cell envelope.
Prescott's Microbiology
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- Choose the best below ? Which of these steps probably occurred first in the chemical andbiological evolution of life? a. The cell membrane of a protobiont formed.b. Formation of the first organic moleculesc. The genetic material was RNA.d. Simple organic monomers formed from inorganic materials.arrow_forwardSieve tubes and sieve elements are a. homoplastic because they have different function. b. homologous because they have similar function. c. homoplastic because their common ancestor was single-celled. d. structures involved in transport within animalsarrow_forwardAccording to " Denisovans: Decoding the Secrets of Our Mysterious Ancient Cousins”, what kinds of tool artifacts were found in the cave near Denisovan specimens? A.Lithic cores B.Levallois cores C.Oldowan Choppers D.Both A and B E.Both A and Carrow_forward
- Choose 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_forwardThis video refers to Denisovans as a “Ghost Lineage.” In fact, Denisovans don’t even have a formal scientific name. What is the physical evidence that anthropologists need to further define and understand the Denisovans? A. None of the above B. A Type Specimen (and more Denisovan fossils) C. Neanderthal DNA D. H. sapiens DNAarrow_forwardScientists think that terrestrial life probably originated in Earth's oceans becauseChoose one: A. energy was available there. B. all of the chemical pieces were there. C. All of the possible answers are correct. D. the earliest evidence for life on Earth comes in ocean-dwelling forms.arrow_forward
- Why can’t scientists just do DNA analysis on these fossil hominins to determine if they are a separate species and possibly what species they belong to? A. The DNA of fossil hominins is too similar to modern humans, making it difficult to distinguish between them. B. The technology for extracting DNA from fossils hasn't been developed yet. C. The fossils would need to be in a -5 degree Celsius environment to prevent DNA from degrading D. Scientists can't perform DNA analysis on fossil hominins because the fossils have been contaminated with modern human DNA over the years, making it impossible to isolate the ancient genetic material.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_forwardOne type of fish fossil is found only in a rock layer near the bottom of a canyon, while a different kind of fish fossil is found only in a rock layer 4,000 feet higher, near the top of the canyon. Which statement would a scientist most likely offer to explain this situation? A.) The fish in the lower layer lived in the deep sea. While the other fish lived in shallow water. B.) The fish in the upper layer lived a healthier life than the other fish. C.) The rock in the lower layer is denser than the rock in the upper layer D.) The rock in the upper layer must have formed in freshwater E.) The fish in the upper layer lived more recently than the other fish. The Geologic Time Scale is a systematic chronological dating process that relates geological strata to time. This methodology is commonly used be geologists, paleontologists, and other Earth scientists to describe the timing and relationships of events that once occurred in history. Which of the following statements can be…arrow_forward
- Which of these steps probably occurred first in the chemical andbiological evolution of life?a. The cell membrane of a protobiont formed.b. The first organic molecules formed.c. The original genetic material was RNA.d. Simple organic monomers formed from inorganic materials.arrow_forwardFossils found in deeper layers of the Earth generally have ____ 14C than fossils found in the upper layers. a. more c. the same amount of b. less d. different types ofarrow_forwardWhich of the following is NOT true for relative dating methods: A. Relies on observational skills B. Includes stratigraphy which is based on ordered layers that build up over time C. Determines if one artifact or fossil is older than another D. Gives you specific dates of the artifact or fossilarrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Fossil: The Language & History of Paleontology; Author: Alliterative;https://www.youtube.com/watch?v=x9yNwRBlKtU;License: Standard youtube license