Life: The Science of Biology
11th Edition
ISBN: 9781319010164
Author: David E. Sadava, David M. Hillis, H. Craig Heller, Sally D. Hacker
Publisher: W. H. Freeman
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Chapter 4.4, Problem 2R
Summary Introduction
To review:
The evidence to prove that the cells existed 3 BYA (billion years ago).
Introduction:
The formation of proto-cells had a basic requirement of the cell membrane in order to have a boundary between cell’s inner chemical space and outer environment. These cell membranes provide a means for a cell to undergo various biochemical reactions in order to survive. The traces of
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Which of the following is true?
A) Life originated around volcanic vents deep in the oceans.
B) Life originated in lakes.
C) Life originated on meteors.
What evidence is there for the hypothesis that life originated on Earth by the creation and polymerization of small organic molecules by natural processes?
What was the Earth like million of years ago?
Chapter 4 Solutions
Life: The Science of Biology
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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?arrow_forwardWhich molecule -DNA or RNA- do scientist believe was found in the first life form on Earth? Why do scientist believe this molecule was first to form life?arrow_forwardWhich of the following steps has not yet been accomplished byscientists studying the origin of life?(A) synthesis of small RNA polymers by ribozymes(B) formation of molecular aggregates with selectivelypermeable membranes(C) formation of protocells that use DNA to direct thepolymerization of amino acids(D) abiotic synthesis of organic moleculesarrow_forward
- What is the most logical theory on the topic of the Origin of Life?arrow_forwardOne of the simplest definitions of a life-form is anything with the capacity to reproduce and regulate itself. Before life began, the complex organic, or hydrocarbon-bearing, molecules that makeup RNA and DNA, the building blocks of life, must have formed. No one knows exactly how life is formed from these molecules, but many ideas have been put forward. As you enter this area, go toward the large video screen on the right and explore the “Life at the hydrothermal Vents” label deck. Some scientists theorize that life begins at deep-sea vents. Find three lines of evidence to support this claim.arrow_forwardHow would you describe earth of millions year agoarrow_forward
- What was the earth like million of years ago? When did the human race first appeared on Earth?arrow_forwardHere is the question: What was the likely source of the raw material incorporated into the first life forms? I believe it is carbon, but I don't know why it is carbon. What I mean is, why is carbon considered the thing that makes something alive? Why are eukaryotes and prokaryotes simply considered alive just because they have carbon. Would that mean that carbon is alive because carbon has carbon? I would appreciate an anwser because I'm really trying to understand everything I run across. I love educating myself and I'm on a quest for knowledge. Thanks guys!arrow_forwardthe landmark experiment by Miller and Urey, and various repeats of this experiment, did not successfully recreate life itself, but why do we consider the results from this experiment as support for the origin of life on Earth?arrow_forward
- Why was the development of enzymes fundamental to the evolution of life? a) without enzymes, the activation energy for essential reactions was too low b) enzymes allowed for high rate of catalysis at relatively low temperatures c) enzymes reduced the cellular demand for ATP d) enzymes allowed for reactions to occur spontaneouslyarrow_forwardFor how long has there been life on Earth? For what percentage of time has life existed on Earth? For about how many years of geological time have human existed on earth?arrow_forward“Life has profoundly changed the Earth.” Explain whether or notthese experimental results support this statement.arrow_forward
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Fossil: The Language & History of Paleontology; Author: Alliterative;https://www.youtube.com/watch?v=x9yNwRBlKtU;License: Standard youtube license