30 Questions
What is the primary characteristic of the organism depicted in the micrograph?
It lacks an endomembrane system
What is the most likely explanation for the organism's inability to generate ATP?
It is a virus
What is the characteristic of the organism that is about 200 nm across its largest dimension?
It is a virus
What is the significance of the filaments observed in the organism?
They are a result of the organism's growth on a petri dish
Which of the following is a characteristic of bacteria?
They have a peptidoglycan cell wall
Which entity acts as a template for protein folding to make more copies of itself?
Prion
What is the reason for the organism's requirement for a host cell?
It is a virus
What is a characteristic of single-celled photosynthetic organisms with nuclei and without cell walls?
They are algae
Which statement is true about bacteriophages?
They have a protein coat
How do prions cause diseases like mad cow disease?
They act as a template to misfold native proteins
What are the three main branches in the phylogenetic tree of life?
Bacteria, Archaea, and Eukaryotes
Which characteristic is unique to protozoa and not found in bacteria?
Endocytosis to engulf nutrients
What is a characteristic of viroids?
They are small pieces of RNA without a protein coat
Which of the following is a characteristic of Archaea?
They have phosphotransferase systems
In Pasteur's experiment, what happened when the flasks were not exposed to air?
No bacteria grew
Why did Tyndall's experiment differ from Pasteur's?
The media Tyndall used contained endospores
What is a major difference between prokaryotes and eukaryotes?
Eukaryotes have a nucleus surrounded by a nuclear membrane
Which of the following is NOT a characteristic of viroids?
They have a protein coat
What is a characteristic of bacteriophages?
They are dimorphic.
What is the most likely identification of the organism shown in the pictures?
A bacteriophage.
What is a structure that is 50 nanometers in diameter and composed of protein, RNA, and lipid most likely an example of?
An enveloped virus.
What could Pasteur logically conclude after his swan necked flask experiment?
Boiling destroys microbes in broth, and they do not regrow from air.
What does it mean when microbes are described as 'diffusion limited'?
They usually grow in an environment with a low diffusion rate.
What is a characteristic of Archaea?
They are a kingdom of Prokaryotes that lack peptidoglycan.
What is the most likely explanation for the presence of two organisms on a petri dish after inoculation?
Your culture was contaminated with prokaryotes
What mechanism do viroids use to infect and kill plant cells?
They cause other proteins in the plant cell to misfold
What is the characteristic of a culture that is growing on a petri dish?
It is diffusion-limited when growing
What is the correct classification of the three domains of life?
Archaea, Bacteria, and Eukaryotes
What would indicate that a newly discovered organism cannot be a virus?
The presence of cell walls
How do prions cause infectious diseases?
By causing misfolding of proteins in the host cell
Test your knowledge of microorganisms, including viruses, viroids, and archaea. This quiz covers the characteristics and features of these microorganisms, as well as cellular structures and processes.
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