Textbook Question
How many different species have been identified by science?
How many are estimated to exist?
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Ch. 14 - The Greatest Species on Earth?
Belk, Maier6th EditionBiology: Science for LifeISBN: 9780135214084
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Table of contents
- Ch. 1 - Can Science Cure the Common Cold?12
- Ch. 2 - Science Fiction, Bad Science, and Pseudoscience12
- Ch. 3 - Is It Possible to Supplement Your Way to Better Performance and Health?10
- Ch. 4 - Body Weight and Health10
- Ch. 5 - Life in the Greenhouse10
- Ch. 6 - Cancer10
- Ch. 7 - Fertility10
- Ch. 8 - Does Testing Save Lives?10
- Ch. 9 - Biology of Wrongful Convictions10
- Ch. 10 - Genetically Modified Organisms10
- Ch. 11 - Where Did We Come From?13
- Ch. 12 - An Evolving Enemy8
- Ch. 13 - Understanding Race11
- Ch. 14 - The Greatest Species on Earth?8
- Ch. 15 - Is the Human Population Too Large?10
- Ch. 16 - Conserving Biodiversity12
- Ch. 17 - The Human Footprint10
Belk, Maier6th EditionBiology: Science for LifeISBN: 9780135214084Not the one you use?Change textbook
Chapter 14, Problem 2
Add labels to the figure that follows, which illustrates the endosymbiotic hypothesis.
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Examine the figure carefully to identify the key components that represent the endosymbiotic hypothesis, such as mitochondria, chloroplasts, and the host cell.
Label the mitochondria in the figure, noting that they are believed to have originated from aerobic bacteria engulfed by an ancestral eukaryotic cell.
Label the chloroplasts in the figure, indicating that they are thought to have evolved from photosynthetic bacteria (such as cyanobacteria) engulfed by the host cell.
Add a label to the host cell, which represents the ancestral eukaryotic cell that incorporated the bacteria through endosymbiosis.
Include arrows or annotations to show the process of engulfment and mutual benefit, emphasizing how the engulfed bacteria evolved into organelles over time.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Endosymbiotic Hypothesis
The endosymbiotic hypothesis proposes that certain organelles, particularly mitochondria and chloroplasts, originated from free-living prokaryotic organisms that were engulfed by ancestral eukaryotic cells. This theory explains the double membrane structure of these organelles and their own DNA, which is similar to bacterial DNA, supporting the idea of a symbiotic relationship that evolved over time.
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06:58
Endosymbiotic Theory
Mitochondria and Chloroplasts
Mitochondria are the powerhouses of the cell, responsible for producing ATP through cellular respiration, while chloroplasts are involved in photosynthesis in plant cells. Both organelles have distinct functions that are crucial for energy metabolism and are key examples of the endosymbiotic theory, as they contain their own DNA and replicate independently of the cell.
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01:29Mitochondria & Chloroplasts Example 1
Evolutionary Significance
The endosymbiotic hypothesis has significant implications for understanding the evolution of eukaryotic cells. It suggests that the complex cellular structures we see today arose from simpler prokaryotic ancestors, highlighting the importance of symbiotic relationships in evolution. This concept helps explain the diversity of life and the interdependence of different organisms.
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02:45History of Evolutionary Theory Example 1
Related Practice
Textbook Question
Which of the following kingdoms or domains is a hodgepodge of different evolutionary lineages?
a. Bacteria
b. Protista
c. Archaea
d. Plantae
e. Animalia
Textbook Question
Comparisons of ribosomal RNA among many different modern species indicate that
a. There are two very divergent groups of prokaryotes
b. The Protista represents a conglomeration of very unrelated forms
c. Fungi are more closely related to animals than to plants
d. A and B are correct
e. A, B, and C are correct
Textbook Question
On examining cells under a microscope, you notice that they occur singly and have no evidence of a nucleus. These cells must belong to a
a. Domain Eukarya
b. Domain Bacteria
c. Domain Archaea
d. The Protista
e. More than one of the above could be correct