교과서 질문
Plastids that are surrounded by more than two membranes are evidence of
a. evolution from mitochondria.
b. fusion of plastids.
c. origin of the plastids from archaea.
d. secondary endosymbiosis.
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2. Cell Chemistry & Cell Components
Endosymbiotic Theory
1:37 minutesProblem 17
교과서 질문
How might the phrase 'ingested but not digested' be used in a description of the endosymbiotic theory?
검증된 단계별 안내1
Understand the endosymbiotic theory: It suggests that certain organelles, like mitochondria and chloroplasts, originated as free-living bacteria that were engulfed by a host cell.
Recognize the concept of 'ingested but not digested': In this context, it means that the engulfed bacteria were taken into the host cell but not broken down or digested.
Relate this to the endosymbiotic theory: The engulfed bacteria were not digested by the host cell's lysosomes, allowing them to survive and establish a symbiotic relationship.
Consider the mutual benefits: The host cell provided protection and nutrients, while the engulfed bacteria contributed additional capabilities, such as energy production.
Reflect on the evolutionary significance: Over time, these bacteria became integral parts of the host cell, evolving into organelles like mitochondria and chloroplasts.
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TextbookSolutions.keyConceptsSubtitle
Endosymbiotic Theory
The endosymbiotic theory posits that certain organelles, particularly mitochondria and chloroplasts, originated as free-living prokaryotes that were engulfed by ancestral eukaryotic cells. This theory explains the dual genetic origins of these organelles, as they contain their own DNA, which is similar to bacterial DNA, supporting the idea of a symbiotic relationship that evolved over time.
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Endosymbiotic Theory
Ingestion vs. Digestion
In the context of biology, 'ingested but not digested' refers to the process where an organism takes in substances that are not fully broken down or utilized. In the endosymbiotic theory, this phrase can illustrate how engulfed prokaryotes were incorporated into eukaryotic cells, where they were not digested but instead formed a mutually beneficial relationship, contributing to the host's metabolic functions.
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5:08Functions of the Digestive System
Symbiosis
Symbiosis is a biological term describing the interaction between two different organisms living in close physical proximity, often to the benefit of both. In the context of the endosymbiotic theory, the relationship between the engulfed prokaryotes and the host eukaryotic cell exemplifies a symbiotic relationship, where the prokaryotes provided essential functions, such as energy production, enhancing the survival and efficiency of the host cell.
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