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Questions and Answers
Which type of electron microscope provides a three-dimensional surface view of a specimen?
Which type of electron microscope provides a three-dimensional surface view of a specimen?
- Optical Microscope
- Atomic Force Microscope
- Scanning Electron Microscope (SEM) (correct)
- Transmission Electron Microscope (TEM)
What is the primary structural component of a virus?
What is the primary structural component of a virus?
- Capsid (correct)
- Mitochondria
- Ribosome
- Cell wall
What is a characteristic of electron microscopes?
What is a characteristic of electron microscopes?
- They can view living specimens
- They produce color images
- They have lower magnification than light microscopes
- They produce black-and-white images (correct)
Which of the following microbes consists only of RNA?
Which of the following microbes consists only of RNA?
What is the correct order of viral replication steps?
What is the correct order of viral replication steps?
Flashcards
Electron Microscope
Electron Microscope
Microscope that uses electrons to view tiny structures.
TEM (Transmission Electron Microscope)
TEM (Transmission Electron Microscope)
Electron microscope type that shows a 2D image.
SEM (Scanning Electron Microscope)
SEM (Scanning Electron Microscope)
Electron microscope type that shows a 3D surface view.
Atomic Force Microscope
Atomic Force Microscope
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Viruses
Viruses
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Study Notes
Electron Microscopes
- There are two types: Transmission (TEM) and Scanning (SEM)
- They have a magnification of up to 100,000x
- Living specimens cannot be viewed using electron microscopes
- Produces black and white images
- TEM shows 2D images, and SEM shows 3D surface views
Atomic Force Microscope
- It can be used to view individual atoms
- It has the highest resolution of all microscopes
Acellular Microbes
- These include viruses and viroids
Viruses
- Their structure includes a protein coat (capsid) with a nucleic acid center
- Some have an additional envelope layer
- Viruses reproduce by hijacking host cells
- The steps of viral reproduction are attachment, penetration, biosynthesis/assembly, and release
- Viruses can be latent by incorporating DNA into the host genome
- Viruses are prevented through vaccines but not treated with antibiotics
Viroids
- Composed only of RNA
- They only infect plants
- Viroids cause plant diseases
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