Textbook Question
Prokaryotic flagella are made of a protein called _________________.
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Ch. 3 - Introduction to Prokaryotic Cells
Norman-McKay2nd EditionMicrobiology: Basic and Clinical PrinciplesISBN: 9780137661619
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Table of contents
- Ch. 1 - Introduction to Microbiology22
- Ch. 2 - Biochemistry Basics19
- Ch. 3 - Introduction to Prokaryotic Cells17
- Ch. 4 - Introduction to Eukaryotic Cells16
- Ch. 5 - Genetics25
- Ch. 6 - Viruses and Prions12
- Ch. 7 - Fundamentals of Microbial Growth20
- Ch. 8 - Microbial Metabolism16
- Ch. 9 - Principles of Infectious Disease and Epidemiology11
- Ch. 10 - Host Microbe Interactions and Pathogenesis19
- Ch. 11 - Innate Immunity24
- Ch. 12 - Adaptive Immunity22
- Ch. 13 - Immune System Disorders15
- Ch. 14 - Biomedical Applications: Vaccines, Diagnostics, Therapeutics, and Molecular Method14
- Ch. 15 - Antimicrobial Drugs18
- Ch. 16 - Respiratory System Infections16
- Ch. 17 - Skin and Eye Infections19
- Ch. 18 - Nervous System Infections12
- Ch. 19 - Digestive System Infections20
- Ch. 20 - Urinary and Reproductive System Infections10
- Ch. 21 - Cardiovascular and Lymphatic Infections15
Norman-McKay2nd EditionMicrobiology: Basic and Clinical PrinciplesISBN: 9780137661619Not the one you use?Change textbook
Chapter 3, Problem 14
Which of the following characteristics regarding prokaryotic ribosomes supports the endosymbiotic theory?
a. Prokaryotic ribosomes are 80S just like eukaryotic ribosomes.
b. Prokaryotic ribosomes are 70S just like mitochondrial ribosomes.
c. Prokaryotic ribosomes make proteins in a similar manner to eukaryotic ribosomes.
d. Prokaryotic ribosomes have two subunits like eukaryotic ribosomes.
e. Prokaryotic ribosomes are intracellular structures like eukaryotic ribosomes.
Verified step by step guidance1
Understand the endosymbiotic theory: it proposes that certain organelles in eukaryotic cells, such as mitochondria, originated from free-living prokaryotes that were engulfed by ancestral eukaryotic cells.
Recall that one key evidence supporting this theory is the similarity between mitochondrial ribosomes and prokaryotic ribosomes, particularly their size and structure.
Identify the characteristic of prokaryotic ribosomes that matches mitochondrial ribosomes, which are known to be 70S in size, unlike the 80S ribosomes found in the cytoplasm of eukaryotic cells.
Compare the options given: the correct choice should highlight the similarity in ribosome size between prokaryotes and mitochondria, supporting the idea that mitochondria evolved from prokaryotes.
Conclude that the characteristic supporting the endosymbiotic theory is that prokaryotic ribosomes are 70S just like mitochondrial ribosomes.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Endosymbiotic Theory
The endosymbiotic theory proposes that certain organelles in eukaryotic cells, such as mitochondria, originated from free-living prokaryotes that were engulfed by ancestral eukaryotic cells. This theory is supported by similarities between mitochondria and prokaryotes, including their own DNA and ribosomes.
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Endosymbiotic Theory
Prokaryotic vs. Eukaryotic Ribosomes
Prokaryotic ribosomes are 70S, composed of 50S and 30S subunits, whereas eukaryotic ribosomes are 80S, made of 60S and 40S subunits. The similarity of mitochondrial ribosomes to prokaryotic 70S ribosomes supports the idea that mitochondria evolved from prokaryotes.
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01:51Prokaryotic Ribosomes
Mitochondrial Ribosomes and Protein Synthesis
Mitochondrial ribosomes resemble prokaryotic ribosomes in size and function, synthesizing proteins within mitochondria independently of the eukaryotic cytoplasmic ribosomes. This similarity is key evidence for the endosymbiotic origin of mitochondria.
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Related Practice
Textbook Question
Which of the following are true regarding osmosis? Select all that apply.
a. It is driven by differences in solute concentration.
b. It is the same as simple diffusion except it involves water.
c. It involves a selectively permeable membrane.
d. It requires energy to occur.
e. It requires specific channels.
f. Water moves from areas of high solute to areas of low solute.
g. Salt moves from high-water to low-water areas.
h. Water moves from areas of low solute to areas of high solute.
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Textbook Question
Describe what would occur if a cell with a damaged cell wall was placed in each of the following environments:
- Isotonic environment
- Hypertonic environment
- Hypotonic environment
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Textbook Question
Certain bacteria can form endospores in order to __________________.
a. Reproduce
b. Survive harsh conditions
c. Cause recurrent infections
d. Adhere to host tissues
e. Avoid the immune system of a host
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Textbook Question
Complete the table by answering yes or no for each question.
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Textbook Question
Which of the following are true regarding Mycoplasma bacteria? Select all that apply.
a. They have cholesterol in their plasma membranes.
b. They are among the largest bacteria characterized to date.
c. They are pleomorphic.
d. They are also called L-forms.
e. They were initially thought to be viruses.
f. Some can act as pathogens.
g. They are classified in domain Archaea.
h. They are prokaryotes.
i. They are sensitive to penicillin-based drugs.
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