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Questions and Answers
Which of the following is the process of capturing a substance or particle from outside the cell by engulfing it with the cell membrane, and bringing it into the cell?
Which of the following is the process of capturing a substance or particle from outside the cell by engulfing it with the cell membrane, and bringing it into the cell?
- Pinocytosis
- Exocytosis
- Phagocytosis
- Endocytosis (correct)
What are the two forms of substances transported by active transport?
What are the two forms of substances transported by active transport?
- Endo and exo
- Solid and liquid
- Ion and molecular (correct)
- Pump and channel
What is the first step in preparing samples for TEM (Transmission Electron Microscopy)?
What is the first step in preparing samples for TEM (Transmission Electron Microscopy)?
- Sectioning with ultramicrotome
- Embedding in resin
- Fixation with formaldehyde (correct)
- Staining with heavy metals
What is a molecule that binds specifically to a receptor called?
What is a molecule that binds specifically to a receptor called?
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Where are intracellular receptors typically found?
Where are intracellular receptors typically found?
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Study Notes
Cell Biology Terms
- Tissue culture is a technique used to keep cells alive and grow in an in vitro environment.
- Anisocytosis is a term used in histology and cytopathology to describe variability in the size, shape, and staining of cells.
Prokaryotic Cell Regions
- A prokaryotic cell has three regions: cytoplasm, cell membrane, and nucleoid.
Membrane Proteins
- Membrane proteins have two types: peripheral proteins and integral proteins.
Transmission Electron Microscopy (TEM)
- When preparing samples for TEM, the tissue is postfixed in osmium tetroxide for 1-2 hours.
Plasma Membrane Model
- The most acceptable model of the plasma membrane is the fluid mosaic model.
Nucleolus Function
- The nucleolus is the site for synthesis of ribosomal RNA.
Facilitated Diffusion
- Facilitated diffusion does not require energy.
Co-transported Ions
- In humans, sodium is a commonly co-transported ion across the plasma membrane.
Membrane Carbohydrates
- Membrane carbohydrates may be covalently bonded to lipids forming glycolipids or to proteins forming glycoproteins.
Cell Biology Definition
- Cytology is a branch of biology that studies the structure, function, and behavior of cells.
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