BIOLOGY
12th Edition
ISBN: 9781260169614
Author: Raven
Publisher: RENT MCG
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Textbook Question
Chapter 25, Problem 2A
Although we do not know how early life arose, the following likely happened:
a. All organic molecules were transported to Earth by meteors.
b. High levels of oxygen were essential for glycolysis.
c. Lipids organized to form cell membranes.
d. Organic molecules formed once temperatures reached moderate levels, equivalent to today’s environment.
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Direct evidence of life on early Earth comes from fossils of microorganisms that lived 3.5 billion years ago. But how did the first living cells appear?
What did the biology experiments on the Viking landers discover?
A. Although Mars's soil is chemically active, it does not contain obviously active micro-organisms.
B. The soil on Mars has much more microbial life in it than a typical soil on the Earth does.
C. Small, nearly microscopic plants are common in the Martian soil.
D. Although there does not appear to be life on Mars today, the soil is full of microscopic fossils.
Which of the following did Stanley miller place in the experimental system to show that organic monomers could have risen from inorganic molecules on the early Earth?
A. Only RNA
B. Microspheres
C. Purines and pyrimidines
D. All of these are correct
Chapter 25 Solutions
BIOLOGY
Ch. 25.1 - Describe the history of the Earth.Ch. 25.1 - Understand the relationship between geological...Ch. 25.2 - Contrast todays atmosphere with the likely...Ch. 25.2 - Prob. 2LOCh. 25.3 - Prob. 1LOCh. 25.4 - Prob. 1LOCh. 25.4 - Prob. 2LOCh. 25.5 - Compare and contrast the evolution of the...Ch. 25.5 - Discuss the types of cell specialization necessary...Ch. 25 - The Miller-Urey experiment demonstrated that a....
Ch. 25 - Plate tectonics can contribute to a. volcanoes and...Ch. 25 - Identify which of the following statements is...Ch. 25 - Which of the following events occurred first in...Ch. 25 - Fossil data indicate that a. life originated 4...Ch. 25 - A global glaciation would be unlikely to occur if...Ch. 25 - Although we do not know how early life arose, the...Ch. 25 - Which bits of evidence would convince you that...Ch. 25 - During which tunes would you expect that...Ch. 25 - The chloroplasts of brown algae a. have a...Ch. 25 - Vascular plants sequestered large amounts of CO2...Ch. 25 - Synthesizing what you have learned in this...Ch. 25 - Prob. 3S
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- Scientists 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_forwardIn what order did events occur that led to life on Earth? (1) appearance of aerobic organisms, (2) appearance of photosynthetic organisms, (3) appearance and increase of O2 in the atmosphere, (4) self-replicating RNA developsa. 4, 2, 3, 1b. 2, 3, 1, 4c. 3, 1, 4, 2d. 1, 2, 4, 3arrow_forwardWhich of these did Stanley Miller place in his experimental systemto show that organic molecules could have arisen from inorganicmolecules on the early Earth?a. microspheresb. purines and pyrimidinesc. gases found in the atmosphere of early Earthd. only RNAe. All of these are correct.arrow_forward
- Which of the following would be the most likely place that life would first form on Earth?Choose one: A. mountaintops B. within the atmosphere C. anywhere D. on the surface at the lowest elevations E. deep under waterarrow_forwardDescribe how scientists have tested the hypothesis that simpleorganic molecules could have formed on the early Eartharrow_forwardThe Miller experiment consisted of various gases, believed to have been present in the early atmosphere of Earth, exposed to an electrical arc. This experiment resulted in a. nothing. b. carbon dioxide gas and water vapor. c. amino acids. d. rain.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_forwardWhich of the following statements supports the concept of the endosymbiotic theory? A. Proteins may be trafficked within the endomembrane system. B. Ribosomes are present in the cytoplasm of prokaryotic cells and eukaryotic cells. C. Chloroplasts have many features in common with bacteria. D. Mitochondria can fuse together to form larger organelles within eukaryotic cells.arrow_forwardThe first forms of life on Earth were a. plants b. microorganisms c. birds d. dinosaursarrow_forward
- Name three different sources of energy that could have powered reactions on early earth to form organic compounds.arrow_forwardwhere on the earth did life mostly likely first emerge, where all the ingredients and conditions for life existed? a. volcanic islands b. deep oceanic vents c. tidal pools d. tropical rainforestarrow_forwardStanley Miller’s classic experiment suggests that ______ ______ of organic compounds may have been the basis of cellular life. a. abiotic synthesis b. biotic synthesis c. spontaneous animation d. extraterrestrial deliveryarrow_forward
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Endosymbiotic Theory; Author: Amoeba Sisters;https://www.youtube.com/watch?v=FGnS-Xk0ZqU;License: Standard Youtube License